Bug 26242 - BUG: unable to handle kernel NULL pointer dereference at (null)
Summary: BUG: unable to handle kernel NULL pointer dereference at (null)
Status: CLOSED CODE_FIX
Alias: None
Product: Memory Management
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: P1 low
Assignee: Andrew Morton
URL:
Keywords:
Depends on:
Blocks: 21782
  Show dependency tree
 
Reported: 2011-01-06 20:59 UTC by Steffen Michalke
Modified: 2011-02-12 23:12 UTC (History)
3 users (show)

See Also:
Kernel Version: 2.6.37
Subsystem:
Regression: Yes
Bisected commit-id:

Attachments
Oops trace (4.64 KB, text/plain)
2011-01-06 21:25 UTC, Steffen Michalke 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Steffen Michalke 2011-01-06 20:59:06 UTC 
My system crashed with the following output:

___
Jan  6 20:06:22 eser kernel: [19365.562621] BUG: unable to handle kernel NULL pointer dereference at   (null)
Jan  6 20:06:22 eser kernel: [19365.562675] IP: [<c022989b>] kmap_atomic_prot+0x1b/0x100
Jan  6 20:06:22 eser kernel: [19365.562709] *pde = 00000000 
Jan  6 20:06:22 eser kernel: [19365.562726] Oops: 0000 [#1] PREEMPT SMP 
Jan  6 20:06:22 eser kernel: [19365.562752] last sysfs file: /sys/devices/platform/coretemp.0/temp1_input
Jan  6 20:06:22 eser kernel: [19365.562777] Modules linked in: isofs usblp usb_storage uas nls_utf8 udf crc_itu_t fuse ipt_MASQUERADE xt_pkttype xt_TCPMSS xt_tcpudp ipt_LOG xt_limit iptable_nat nf_nat snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device xt_NOTRACK ipt_REJECT xt_state iptable_raw iptable_filter nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf speedstep_lib ip6_tables x_tables loop arc4 ecb b43 snd_hda_codec_si3054 mac80211 snd_hda_codec_realtek snd_hda_intel r8169 snd_hda_codec cfg80211 sdhci_pci mii snd_hwdep acer_wmi sdhci snd_pcm rfkill iTCO_wdt yenta_socket ssb tifm_7xx1 iTCO_vendor_support sg sr_mod mmc_core snd_timer pcmcia_core tifm_core cdrom pcspkr wmi pcmcia_rsrc psmouse snd i2c_i801 shpchp evdev soundcore battery rng_core ac snd_page_alloc pci_hotplug dm_crypt usbhid hid nouveau ttm drm_kms_helper drm uhci_hcd rtc_cmos ata_piix i2c_algo_bit i2c_core rtc_core cfbcopyarea ehci_hcd usb
Jan  6 20:06:22 eser kernel: core video cfbimgblt cfbfillrect rtc_lib output button nls_base dm_snapshot sha512_generic sha256_generic xts cbc aes_i586 aes_generic cfq_iosched blk_cgroup btrfs zlib_deflate libcrc32c reiserfs ahci libahci libata coretemp hwmon fan thermal processor unix [last unloaded: pktcdvd]
Jan  6 20:06:22 eser kernel: [19365.563014] 
Jan  6 20:06:22 eser kernel: [19365.563014] Pid: 15675, comm: gimp-2.6 Not tainted 2.6.37 #1 Myall2                         /Aspire 9410
Jan  6 20:06:22 eser kernel: [19365.563014] EIP: 0060:[<c022989b>] EFLAGS: 00010202 CPU: 0
Jan  6 20:06:22 eser kernel: [19365.563014] EIP is at kmap_atomic_prot+0x1b/0x100
Jan  6 20:06:22 eser kernel: [19365.563014] EAX: 00000000 EBX: 00000600 ECX: f3a82000 EDX: 00000163
Jan  6 20:06:23 eser kernel: [19365.563014] ESI: f3a83eac EDI: 00000000 EBP: f3a83db8 ESP: f3a83da8
Jan  6 20:06:23 eser kernel: [19365.563014]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Jan  6 20:06:23 eser kernel: [19365.563014] Process gimp-2.6 (pid: 15675, ti=f3a82000 task=eaf28000 task.ti=f3a82000)
Jan  6 20:06:23 eser kernel: [19365.563014] Stack:
Jan  6 20:06:23 eser kernel: [19365.563014]  f3a83dc0 00000600 f3a83eac 00000000 f3a83dc0 c022998e f3a83dd8 c0299c0c
Jan  6 20:06:23 eser kernel: [19365.563014]  e0359240 00000600 00001000 00001000 f3a83dfc f828d6da 00000600 00001008
Jan  6 20:06:23 eser kernel: [19365.563014]  00000002 00000000 00000002 00002000 00001608 f3a83ed0 f828e1ff 00001608
Jan  6 20:06:23 eser kernel: [19365.563014] Call Trace:
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c022998e>] ? __kmap_atomic+0xe/0x10
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0299c0c>] ? iov_iter_copy_from_user_atomic+0x3c/0x90
Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828d6da>] ? btrfs_copy_from_user+0x5a/0xb0 [btrfs]
Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828e1ff>] ? btrfs_file_aio_write+0x52f/0x9c0 [btrfs]
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d0810>] ? __mem_cgroup_commit_charge+0x70/0xe0
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d672c>] ? do_sync_write+0x9c/0xd0
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6b15>] ? rw_verify_area+0x65/0x100
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6e7a>] ? vfs_write+0x9a/0x160
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d8211>] ? fget_light+0x91/0xb0
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6690>] ? do_sync_write+0x0/0xd0
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d714d>] ? sys_write+0x3d/0x70
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0202e18>] ? sysenter_do_call+0x12/0x28
Jan  6 20:06:23 eser kernel: [19365.563014]  [<c04e0000>] ? quirk_amd_ide_mode+0x40/0x95
Jan  6 20:06:23 eser kernel: [19365.563014] Code: 8b 15 4c 6a 6b c0 55 89 e5 e8 e2 f8 ff ff 5d c3 55 89 e5 83 ec 10 89 e1 81 e1 00 e0 ff ff 89 5d f4 89 75 f8 89 7d fc 83 41 14 01 <8b> 08 c1 e9 1e 69 d9 40 03 00 00 8d 8b c0 42 64 c0 2b 8b cc 45 
Jan  6 20:06:23 eser kernel: [19365.563014] EIP: [<c022989b>] kmap_atomic_prot+0x1b/0x100 SS:ESP 0068:f3a83da8
Jan  6 20:06:23 eser kernel: [19365.563014] CR2: 0000000000000000
Jan  6 20:06:23 eser kernel: [19365.568714] ---[ end trace afc2be06c7d06a71 ]---
Jan  6 20:06:23 eser kernel: [19365.568724] note: gimp-2.6[15675] exited with preempt_count 2
___

The kernel is an unpatched v2.6.37. I have not seen something like this before.


eser:~ # /usr/src/linux/scripts/ver_linux
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.

Linux eser 2.6.37 #1 SMP PREEMPT Wed Jan 5 11:17:04 CET 2011 i686 i686 i386 GNU/Linux

Gnu C                  4.5
Gnu make               3.81
binutils               11.3
2.20.0.20100122
util-linux             2.17.2
mount                  support
module-init-tools      3.12-pre3
e2fsprogs              1.41.11
reiserfsprogs          3.6.21
pcmciautils            015
PPP                    2.4.5
isdn4k-utils           3.13
Linux C Library        2.11.2
Dynamic linker (ldd)   2.11.2
Procps                 3.2.8
Net-tools              1.60
Kbd                    1.14.1
Sh-utils               7.1
wireless-tools         30
Modules Loaded         usblp nls_utf8 isofs fuse ipt_MASQUERADE xt_pkttype xt_TCPMSS xt_tcpudp ipt_LOG xt_limit iptable_nat nf_nat snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device xt_NOTRACK ipt_REJECT xt_state iptable_raw iptable_filter nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables cpufreq_conservative ip6_tables cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf x_tables speedstep_lib loop arc4 ecb b43 snd_hda_codec_si3054 mac80211 snd_hda_codec_realtek cfg80211 sg sr_mod snd_hda_intel iTCO_wdt usb_storage sdhci_pci tifm_7xx1 iTCO_vendor_support snd_hda_codec ssb uas r8169 sdhci tifm_core cdrom snd_hwdep acer_wmi mii snd_pcm rfkill mmc_core yenta_socket snd_timer pcmcia_core psmouse shpchp evdev i2c_i801 ac rng_core battery pcmcia_rsrc snd wmi pcspkr soundcore pci_hotplug snd_page_alloc dm_crypt usbhid hid nouveau ttm drm_kms_helper drm uhci_hcd ata_piix i2c_algo_bit i2c_core ehci_hcd cfbcopyarea rtc_cmos video rtc_core usbcore cfbimgblt rtc_lib cfbfillrect output button nls_base dm_snapshot sha512_generic sha256_generic xts cbc aes_i586 aes_generic cfq_iosched blk_cgroup btrfs zlib_deflate libcrc32c reiserfs ahci libahci libata coretemp hwmon fan thermal processor unix

___
eser:~ # cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU           T2080  @ 1.73GHz
stepping        : 12
cpu MHz         : 1733.000
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon bts aperfmperf pni monitor est tm2 xtpr pdcm dts
bogomips        : 3458.34
clflush size    : 64
cache_alignment : 64
address sizes   : 32 bits physical, 32 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU           T2080  @ 1.73GHz
stepping        : 12
cpu MHz         : 1733.000
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
apicid          : 1
initial apicid  : 1
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon bts aperfmperf pni monitor est tm2 xtpr pdcm dts
bogomips        : 3458.35
clflush size    : 64
cache_alignment : 64
address sizes   : 32 bits physical, 32 bits virtual
power management:
___

eser:~ # cat /proc/modules
usblp 9685 0 - Live 0xfd6d3000
nls_utf8 1005 0 - Live 0xf805e000
isofs 28957 0 - Live 0xf8379000
fuse 59907 19 - Live 0xfb8bd000
ipt_MASQUERADE 1299 2 - Live 0xfb892000
xt_pkttype 772 5 - Live 0xfb882000
xt_TCPMSS 2663 1 - Live 0xfb879000
xt_tcpudp 1871 9 - Live 0xfb86f000
ipt_LOG 6732 12 - Live 0xfb864000
xt_limit 1405 12 - Live 0xfb859000
iptable_nat 3373 1 - Live 0xfb842000
nf_nat 14595 2 ipt_MASQUERADE,iptable_nat, Live 0xfb833000
snd_pcm_oss 32912 0 - Live 0xfb815000
snd_mixer_oss 12451 1 snd_pcm_oss, Live 0xfb7fe000
snd_seq 43135 0 - Live 0xfb7e3000
snd_seq_device 5374 1 snd_seq, Live 0xfb7ca000
xt_NOTRACK 708 2 - Live 0xfb714000
ipt_REJECT 1953 3 - Live 0xfb705000
xt_state 926 13 - Live 0xfb6fb000
iptable_raw 1042 1 - Live 0xfb6ef000
iptable_filter 1214 1 - Live 0xfb6e2000
nf_conntrack_netbios_ns 1210 0 - Live 0xfb6d8000
nf_conntrack_ipv4 5796 16 iptable_nat,nf_nat, Live 0xfb6cd000
nf_conntrack 61410 7 ipt_MASQUERADE,iptable_nat,nf_nat,xt_NOTRACK,xt_state,nf_conntrack_netbios_ns,nf_conntrack_ipv4, Live 0xfb6ad000
nf_defrag_ipv4 1125 1 nf_conntrack_ipv4, Live 0xfb68e000
ip_tables 9787 3 iptable_nat,iptable_raw,iptable_filter, Live 0xfb683000
cpufreq_conservative 8742 0 - Live 0xfb673000
ip6_tables 11219 0 - Live 0xfb663000
cpufreq_userspace 2315 0 - Live 0xfb655000
cpufreq_powersave 774 0 - Live 0xfb64b000
acpi_cpufreq 6755 0 - Live 0xfb641000
mperf 1147 1 acpi_cpufreq, Live 0xfb635000
x_tables 14760 14 ipt_MASQUERADE,xt_pkttype,xt_TCPMSS,xt_tcpudp,ipt_LOG,xt_limit,iptable_nat,xt_NOTRACK,ipt_REJECT,xt_state,iptable_raw,iptable_filter,ip_tables,ip6_tables, Live 0xfb62a000
speedstep_lib 4877 0 - Live 0xfb60c000
loop 14086 0 - Live 0xfb41d000
arc4 1077 2 - Live 0xfb289000
ecb 1603 2 - Live 0xfb280000
b43 157282 0 - Live 0xfb24b000
snd_hda_codec_si3054 3192 1 - Live 0xfb1a6000
mac80211 185594 1 b43, Live 0xfb165000
snd_hda_codec_realtek 245049 1 - Live 0xfb0dd000
cfg80211 132290 2 b43,mac80211, Live 0xfb051000
sg 23767 0 - Live 0xfb035000
sr_mod 11745 0 - Live 0xfb049000
snd_hda_intel 20744 2 - Live 0xfafe4000
iTCO_wdt 9404 0 - Live 0xfaf9f000
usb_storage 38293 0 - Live 0xfaf82000
sdhci_pci 6292 0 - Live 0xfaf61000
tifm_7xx1 3582 0 - Live 0xfaf51000
iTCO_vendor_support 2334 1 iTCO_wdt, Live 0xfaf46000
snd_hda_codec 79842 3 snd_hda_codec_si3054,snd_hda_codec_realtek,snd_hda_intel, Live 0xfaf1c000
ssb 32491 1 b43, Live 0xfaee3000
uas 6631 0 - Live 0xfaef8000
r8169 33060 0 - Live 0xfaec1000
sdhci 15980 1 sdhci_pci, Live 0xfaea8000
tifm_core 5528 1 tifm_7xx1, Live 0xfae97000
cdrom 32582 1 sr_mod, Live 0xfae83000
snd_hwdep 4730 1 snd_hda_codec, Live 0xfae65000
acer_wmi 13306 0 - Live 0xfae69000
mii 4241 1 r8169, Live 0xfae50000
snd_pcm 67878 4 snd_pcm_oss,snd_hda_codec_si3054,snd_hda_intel,snd_hda_codec, Live 0xfae30000
rfkill 14990 2 cfg80211,acer_wmi, Live 0xfae0b000
mmc_core 61652 1 sdhci, Live 0xfade7000
yenta_socket 19736 0 - Live 0xfadc0000
snd_timer 17007 2 snd_seq,snd_pcm, Live 0xfad9b000
pcmcia_core 13261 1 yenta_socket, Live 0xfad86000
psmouse 35208 0 - Live 0xfad28000
shpchp 23358 0 - Live 0xfaccc000
evdev 7389 11 - Live 0xfac84000
i2c_i801 6504 0 - Live 0xfac3a000
ac 2591 0 - Live 0xfac2e000
rng_core 3120 1 b43, Live 0xfac24000
battery 8464 0 - Live 0xfac18000
pcmcia_rsrc 881 1 yenta_socket, Live 0xfac0b000
snd 50680 15 snd_pcm_oss,snd_mixer_oss,snd_seq,snd_seq_device,snd_hda_codec_si3054,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer, Live 0xfabf1000
wmi 8065 1 acer_wmi, Live 0xfabd4000
pcspkr 1410 0 - Live 0xfabc8000
soundcore 6150 1 snd, Live 0xfabbc000
pci_hotplug 23957 1 shpchp, Live 0xfab7d000
snd_page_alloc 6808 2 snd_hda_intel,snd_pcm, Live 0xfaba5000
dm_crypt 10485 2 - Live 0xf935d000
usbhid 32913 0 - Live 0xf931e000
hid 43574 1 usbhid, Live 0xf9302000
nouveau 501346 2 - Live 0xf880d000
ttm 51728 1 nouveau, Live 0xf875a000
drm_kms_helper 29205 1 nouveau, Live 0xf8735000
drm 149127 4 nouveau,ttm,drm_kms_helper, Live 0xf86f2000
uhci_hcd 19381 0 - Live 0xf86a8000
ata_piix 19167 4 - Live 0xf862d000
i2c_algo_bit 4520 1 nouveau, Live 0xf86b8000
i2c_core 20537 5 i2c_i801,nouveau,drm_kms_helper,drm,i2c_algo_bit, Live 0xf8690000
ehci_hcd 34110 0 - Live 0xf8659000
cfbcopyarea 3037 1 nouveau, Live 0xf867b000
rtc_cmos 8019 0 - Live 0xf866b000
video 11762 1 nouveau, Live 0xf8619000
rtc_core 13965 1 rtc_cmos, Live 0xf85fc000
usbcore 128459 6 usblp,usb_storage,uas,usbhid,uhci_hcd,ehci_hcd, Live 0xf8444000
cfbimgblt 2064 1 nouveau, Live 0xf860a000
rtc_lib 2173 1 rtc_core, Live 0xf84ae000
cfbfillrect 3113 1 nouveau, Live 0xf85d5000
output 1699 1 video, Live 0xf83dc000
button 4634 1 nouveau, Live 0xf83d1000
nls_base 6389 3 nls_utf8,isofs,usbcore, Live 0xf8383000
dm_snapshot 25099 0 - Live 0xf8370000
sha512_generic 7176 0 - Live 0xf835d000
sha256_generic 11147 2 - Live 0xf8350000
xts 1923 1 - Live 0xf8344000
cbc 2189 1 - Live 0xf833a000
aes_i586 7224 4 - Live 0xf832f000
aes_generic 26851 1 aes_i586, Live 0xf831d000
cfq_iosched 22870 3 - Live 0xf8306000
blk_cgroup 13215 2 cfq_iosched, Live 0xf82f0000
btrfs 483671 3 - Live 0xf825f000
zlib_deflate 18985 1 btrfs, Live 0xf81bf000
libcrc32c 767 1 btrfs, Live 0xf81b2000
reiserfs 219786 1 - Live 0xf816e000
ahci 18214 0 - Live 0xf811c000
libahci 18496 1 ahci, Live 0xf8105000
libata 178625 3 ata_piix,ahci,libahci, Live 0xf80bb000
coretemp 4832 0 - Live 0xf8076000
hwmon 1472 1 coretemp, Live 0xf806a000
fan 1971 0 - Live 0xf8056000
thermal 7944 0 - Live 0xf8052000
processor 29878 3 acpi_cpufreq, Live 0xf803c000
unix 21363 816 - Live 0xf8001000
___
eser:~ # cat /proc/ioports 
0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-0060 : keyboard
0062-0062 : EC data
0064-0064 : keyboard
0066-0066 : EC cmd
0070-0077 : rtc0
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : 0000:00:1f.2
  0170-0177 : ata_piix
01f0-01f7 : 0000:00:1f.2
  01f0-01f7 : ata_piix
0376-0376 : 0000:00:1f.2
  0376-0376 : ata_piix
03c0-03df : vga+
03f6-03f6 : 0000:00:1f.2
  03f6-03f6 : ata_piix
0680-068f : pnp 00:06
06a0-06af : pnp 00:07
06b0-06ff : pnp 00:07
0800-080f : pnp 00:06
0cf8-0cff : PCI conf1
1000-107f : 0000:00:1f.0
  1000-107f : pnp 00:06
    1000-1003 : ACPI PM1a_EVT_BLK
    1004-1005 : ACPI PM1a_CNT_BLK
    1008-100b : ACPI PM_TMR
    1010-1015 : ACPI CPU throttle
    1020-1020 : ACPI PM2_CNT_BLK
    1028-102f : ACPI GPE0_BLK
1180-11bf : 0000:00:1f.0
  1180-11bf : pnp 00:06
1200-120f : pnp 00:06
1800-181f : 0000:00:1d.0
  1800-181f : uhci_hcd
1820-183f : 0000:00:1d.1
  1820-183f : uhci_hcd
1840-185f : 0000:00:1d.2
  1840-185f : uhci_hcd
1860-187f : 0000:00:1d.3
  1860-187f : uhci_hcd
18b0-18bf : 0000:00:1f.2
  18b0-18bf : ata_piix
18c0-18df : 0000:00:1f.3
2000-2fff : PCI Bus 0000:02
  2000-20ff : 0000:02:00.0
    2000-20ff : r8169
3000-3fff : PCI Bus 0000:03
4000-4fff : PCI Bus 0000:05
5000-5fff : PCI Bus 0000:0a
  5000-50ff : PCI CardBus 0000:0b
  5400-54ff : PCI CardBus 0000:0b
___
eser:~ # cat /proc/iomem 
00000000-0000ffff : reserved
00010000-0009f7ff : System RAM
0009f800-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000cefff : Video ROM
000dc000-000fffff : reserved
  000f0000-000fffff : System ROM
00100000-3fe8ffff : System RAM
  00200000-004ede60 : Kernel code
  004ede61-00648527 : Kernel data
  006aa000-0072806b : Kernel bss
3fe90000-3fefffff : ACPI Non-volatile Storage
3ff00000-3fffffff : reserved
40000000-43ffffff : PCI Bus 0000:0a
  40000000-43ffffff : PCI CardBus 0000:0b
44000000-47ffffff : PCI CardBus 0000:0b
c0000000-cfffffff : PCI Bus 0000:01
  c0000000-cfffffff : 0000:01:00.0
d0000000-d1ffffff : PCI Bus 0000:02
  d0000000-d001ffff : 0000:02:00.0
d2000000-d3ffffff : PCI Bus 0000:03
d4000000-d5ffffff : PCI Bus 0000:05
d6000000-d7ffffff : PCI Bus 0000:02
  d6000000-d6000fff : 0000:02:00.0
    d6000000-d6000fff : r8169
d8000000-d9ffffff : PCI Bus 0000:03
da000000-dbffffff : PCI Bus 0000:05
  da000000-da003fff : 0000:05:00.0
    da000000-da003fff : 0000:05:00.0
dc000000-ddffffff : PCI Bus 0000:01
  dc000000-dcffffff : 0000:01:00.0
  dd000000-ddffffff : 0000:01:00.0
de000000-de0fffff : PCI Bus 0000:0a
  de000000-de000fff : 0000:0a:06.0
    de000000-de000fff : yenta_socket
  de004000-de004fff : 0000:0a:06.2
    de004000-de004fff : tifm_7xx1
  de005800-de0058ff : 0000:0a:06.3
    de005800-de0058ff : mmc0
de300000-de303fff : 0000:00:1b.0
  de300000-de303fff : ICH HD audio
de304000-de3043ff : 0000:00:1d.7
  de304000-de3043ff : ehci_hcd
e0000000-efffffff : PCI MMCONFIG 0000 [bus 00-ff]
  e0000000-efffffff : reserved
    e0000000-efffffff : pnp 00:01
fec00000-fec0ffff : reserved
  fec00000-fec003ff : IOAPIC 0
fec28000-fec283ff : IOAPIC 1
fed00000-fed003ff : HPET 0
  fed00000-fed003ff : reserved
    fed00000-fed003ff : pnp 00:04
fed14000-fed19fff : reserved
  fed14000-fed17fff : pnp 00:01
  fed18000-fed18fff : pnp 00:01
  fed19000-fed19fff : pnp 00:01
fed1c000-fed8ffff : reserved
  fed1c000-fed1ffff : pnp 00:01
  fed20000-fed3ffff : pnp 00:01
  fed40000-fed44fff : pnp 00:01
  fed45000-fed8ffff : pnp 00:01
fee00000-fee00fff : Local APIC
  fee00000-fee00fff : reserved
ff000000-ffffffff : reserved
___
eser:~ # lspci -vvv
00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: [e0] Vendor Specific Information: Len=09 <?>

00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express PCI Express Root Port (rev 03) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: 0000f000-00000fff
	Memory behind bridge: dc000000-ddffffff
	Prefetchable memory behind bridge: 00000000c0000000-00000000cfffffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [88] Subsystem: Acer Incorporated [ALI] Device 0107
	Capabilities: [80] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
		Address: 00000000  Data: 0000
	Capabilities: [a0] Express (v1) Root Port (Slot+), MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
			ExtTag- RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
		LnkCap:	Port #2, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <256ns, L1 <4us
			ClockPM- Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
		SltCap:	AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug- Surprise-
			Slot #1, PowerLimit 75.000W; Interlock- NoCompl-
		SltCtl:	Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
			Control: AttnInd Off, PwrInd On, Power- Interlock-
		SltSta:	Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
			Changed: MRL- PresDet+ LinkState-
		RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
		RootCap: CRSVisible-
		RootSta: PME ReqID 0000, PMEStatus- PMEPending-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed+ WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
	Capabilities: [140 v1] Root Complex Link
		Desc:	PortNumber=02 ComponentID=01 EltType=Config
		Link0:	Desc:	TargetPort=00 TargetComponent=01 AssocRCRB- LinkType=MemMapped LinkValid+
			Addr:	00000000fed19000

00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 02)
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 297
	Region 0: Memory at de300000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: [50] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
		Address: 00000000fee0300c  Data: 4171
	Capabilities: [70] Express (v1) Root Complex Integrated Endpoint, MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
			ExtTag- RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
		LnkCap:	Port #0, Speed unknown, Width x0, ASPM unknown, Latency L0 <64ns, L1 <1us
			ClockPM- Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; Disabled- Retrain- CommClk-
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed unknown, Width x0, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
		VC1:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=1 ArbSelect=Fixed TC/VC=80
			Status:	NegoPending- InProgress-
	Capabilities: [130 v1] Root Complex Link
		Desc:	PortNumber=0f ComponentID=02 EltType=Config
		Link0:	Desc:	TargetPort=00 TargetComponent=02 AssocRCRB- LinkType=MemMapped LinkValid+
			Addr:	00000000fed1c000
	Kernel driver in use: HDA Intel

00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 02) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
	I/O behind bridge: 00002000-00002fff
	Memory behind bridge: d6000000-d7ffffff
	Prefetchable memory behind bridge: 00000000d0000000-00000000d1ffffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [40] Express (v1) Root Port (Slot+), MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
			ExtTag- RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
		LnkCap:	Port #1, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <256ns, L1 <4us
			ClockPM- Surprise- LLActRep+ BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive+ BWMgmt- ABWMgmt-
		SltCap:	AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+
			Slot #2, PowerLimit 6.500W; Interlock- NoCompl-
		SltCtl:	Enable: AttnBtn- PwrFlt- MRL- PresDet+ CmdCplt- HPIrq- LinkChg-
			Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock-
		SltSta:	Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
			Changed: MRL- PresDet- LinkState-
		RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
		RootCap: CRSVisible-
		RootSta: PME ReqID 0000, PMEStatus- PMEPending-
	Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
		Address: 00000000  Data: 0000
	Capabilities: [90] Subsystem: Acer Incorporated [ALI] Device 0107
	Capabilities: [a0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed+ WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
		VC1:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable- ID=0 ArbSelect=Fixed TC/VC=00
			Status:	NegoPending- InProgress-
	Capabilities: [180 v1] Root Complex Link
		Desc:	PortNumber=01 ComponentID=02 EltType=Config
		Link0:	Desc:	TargetPort=00 TargetComponent=02 AssocRCRB- LinkType=MemMapped LinkValid+
			Addr:	00000000fed1c001

00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 02) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=03, subordinate=04, sec-latency=0
	I/O behind bridge: 00003000-00003fff
	Memory behind bridge: d8000000-d9ffffff
	Prefetchable memory behind bridge: 00000000d2000000-00000000d3ffffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [40] Express (v1) Root Port (Slot+), MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
			ExtTag- RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
		LnkCap:	Port #2, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <1us, L1 <4us
			ClockPM- Surprise- LLActRep+ BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk-
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x0, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
		SltCap:	AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+
			Slot #3, PowerLimit 6.500W; Interlock- NoCompl-
		SltCtl:	Enable: AttnBtn- PwrFlt- MRL- PresDet+ CmdCplt- HPIrq- LinkChg-
			Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock-
		SltSta:	Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet- Interlock-
			Changed: MRL- PresDet- LinkState-
		RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
		RootCap: CRSVisible-
		RootSta: PME ReqID 0000, PMEStatus- PMEPending-
	Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
		Address: 00000000  Data: 0000
	Capabilities: [90] Subsystem: Acer Incorporated [ALI] Device 0107
	Capabilities: [a0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed+ WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
			Status:	NegoPending- InProgress-
		VC1:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable- ID=0 ArbSelect=Fixed TC/VC=00
			Status:	NegoPending- InProgress-
	Capabilities: [180 v1] Root Complex Link
		Desc:	PortNumber=02 ComponentID=02 EltType=Config
		Link0:	Desc:	TargetPort=00 TargetComponent=02 AssocRCRB- LinkType=MemMapped LinkValid+
			Addr:	00000000fed1c001

00:1c.2 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 3 (rev 02) (prog-if 00 [Normal decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Bus: primary=00, secondary=05, subordinate=06, sec-latency=0
	I/O behind bridge: 00004000-00004fff
	Memory behind bridge: da000000-dbffffff
	Prefetchable memory behind bridge: 00000000d4000000-00000000d5ffffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [40] Express (v1) Root Port (Slot+), MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
			ExtTag- RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
		LnkCap:	Port #3, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <256ns, L1 <4us
			ClockPM- Surprise- LLActRep+ BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive+ BWMgmt- ABWMgmt-
		SltCap:	AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+
			Slot #4, PowerLimit 6.500W; Interlock- NoCompl-
		SltCtl:	Enable: AttnBtn- PwrFlt- MRL- PresDet+ CmdCplt- HPIrq- LinkChg-
			Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock-
		SltSta:	Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
			Changed: MRL- PresDet- LinkState-
		RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
		RootCap: CRSVisible-
		RootSta: PME ReqID 0000, PMEStatus- PMEPending-
	Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
		Address: 00000000  Data: 0000
	Capabilities: [90] Subsystem: Acer Incorporated [ALI] Device 0107
	Capabilities: [a0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed+ WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
		VC1:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable- ID=0 ArbSelect=Fixed TC/VC=00
			Status:	NegoPending- InProgress-
	Capabilities: [180 v1] Root Complex Link
		Desc:	PortNumber=03 ComponentID=02 EltType=Config
		Link0:	Desc:	TargetPort=00 TargetComponent=02 AssocRCRB- LinkType=MemMapped LinkValid+
			Addr:	00000000fed1c001

00:1d.0 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 23
	Region 4: I/O ports at 1800 [size=32]
	Kernel driver in use: uhci_hcd

00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 19
	Region 4: I/O ports at 1820 [size=32]
	Kernel driver in use: uhci_hcd

00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin C routed to IRQ 18
	Region 4: I/O ports at 1840 [size=32]
	Kernel driver in use: uhci_hcd

00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 02) (prog-if 00 [UHCI])
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin D routed to IRQ 16
	Region 4: I/O ports at 1860 [size=32]
	Kernel driver in use: uhci_hcd

00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 02) (prog-if 20 [EHCI])
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 23
	Region 0: Memory at de304000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: [50] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [58] Debug port: BAR=1 offset=00a0
	Kernel driver in use: ehci_hcd

00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2) (prog-if 01 [Subtractive decode])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Bus: primary=00, secondary=0a, subordinate=0e, sec-latency=56
	I/O behind bridge: 00005000-00005fff
	Memory behind bridge: de000000-de0fffff
	Prefetchable memory behind bridge: 0000000040000000-0000000043ffffff
	Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: [50] Subsystem: Acer Incorporated [ALI] Device 0107

00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Capabilities: [e0] Vendor Specific Information: Len=0c <?>

00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 02) (prog-if 80 [Master])
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 19
	Region 0: I/O ports at 01f0 [size=8]
	Region 1: I/O ports at 03f4 [size=1]
	Region 2: I/O ports at 0170 [size=8]
	Region 3: I/O ports at 0374 [size=1]
	Region 4: I/O ports at 18b0 [size=16]
	Capabilities: [70] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: ata_piix

00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 02)
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin B routed to IRQ 19
	Region 4: I/O ports at 18c0 [size=32]

01:00.0 VGA compatible controller: nVidia Corporation G72M [Quadro NVS 110M/GeForce Go 7300] (rev a1) (prog-if 00 [VGA controller])
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at dd000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Region 3: Memory at dc000000 (64-bit, non-prefetchable) [size=16M]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [60] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
		Address: 0000000000000000  Data: 0000
	Capabilities: [78] Express (v1) Endpoint, MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s <256ns, L1 <4us
			ExtTag- AttnBtn- AttnInd- PwrInd- RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 512 bytes
		DevSta:	CorrErr- UncorrErr+ FatalErr- UnsuppReq+ AuxPwr- TransPend-
		LnkCap:	Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <256ns, L1 <4us
			ClockPM- Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
	Capabilities: [128 v1] Power Budgeting <?>
	Kernel driver in use: nouveau

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR+ <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 296
	Region 0: I/O ports at 2000 [size=256]
	Region 2: Memory at d6000000 (64-bit, non-prefetchable) [size=4K]
	[virtual] Expansion ROM at d0000000 [disabled] [size=128K]
	Capabilities: [40] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0-,D1+,D2+,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [48] Vital Product Data
		Unknown small resource type 00, will not decode more.
	Capabilities: [50] MSI: Enable+ Count=1/2 Maskable- 64bit+
		Address: 00000000fee0300c  Data: 4169
	Capabilities: [60] Express (v1) Endpoint, MSI 00
		DevCap:	MaxPayload 1024 bytes, PhantFunc 0, Latency L0s <1us, L1 unlimited
			ExtTag+ AttnBtn+ AttnInd+ PwrInd+ RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 4096 bytes
		DevSta:	CorrErr- UncorrErr+ FatalErr- UnsuppReq+ AuxPwr+ TransPend-
		LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s, Latency L0 unlimited, L1 unlimited
			ClockPM- Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
	Capabilities: [84] Vendor Specific Information: Len=4c <?>
	Capabilities: [100 v1] Advanced Error Reporting
		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol-
		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UESvrt:	DLP+ SDES- TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
		AERCap:	First Error Pointer: 14, GenCap- CGenEn- ChkCap- ChkEn-
	Capabilities: [12c v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
	Capabilities: [148 v1] Device Serial Number 1a-00-00-00-10-ec-81-68
	Capabilities: [154 v1] Power Budgeting <?>
	Kernel driver in use: r8169

05:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)
	Subsystem: AMBIT Microsystem Corp. Device 0422
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at da000000 (32-bit, non-prefetchable) [size=16K]
	Capabilities: [40] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=2 PME-
	Capabilities: [58] MSI: Enable- Count=1/1 Maskable- 64bit-
		Address: 00000000  Data: 0000
	Capabilities: [d0] Express (v1) Legacy Endpoint, MSI 00
		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE- FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
			MaxPayload 128 bytes, MaxReadReq 128 bytes
		DevSta:	CorrErr- UncorrErr+ FatalErr- UnsuppReq+ AuxPwr+ TransPend-
		LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s, Latency L0 <4us, L1 <64us
			ClockPM- Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
	Capabilities: [100 v1] Advanced Error Reporting
		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol-
		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UESvrt:	DLP+ SDES- TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
		AERCap:	First Error Pointer: 14, GenCap+ CGenEn- ChkCap+ ChkEn-
	Capabilities: [13c v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
	Kernel driver in use: b43-pci-bridge

0a:06.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 168, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 22
	Region 0: Memory at de000000 (32-bit, non-prefetchable) [size=4K]
	Bus: primary=0a, secondary=0b, subordinate=0e, sec-latency=176
	Memory window 0: 40000000-43fff000 (prefetchable)
	Memory window 1: 44000000-47fff000
	I/O window 0: 00005000-000050ff
	I/O window 1: 00005400-000054ff
	BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset+ 16bInt+ PostWrite+
	16-bit legacy interface ports at 0001
	Kernel driver in use: yenta_cardbus

0a:06.2 Mass storage controller: Texas Instruments 5-in-1 Multimedia Card Reader (SD/MMC/MS/MS PRO/xD)
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 57 (1750ns min, 1000ns max), Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 22
	Region 0: Memory at de004000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [44] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: tifm_7xx1

0a:06.3 SD Host controller: Texas Instruments PCIxx12 SDA Standard Compliant SD Host Controller
	Subsystem: Acer Incorporated [ALI] Device 0107
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 57 (1750ns min, 1000ns max), Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 22
	Region 0: Memory at de005800 (32-bit, non-prefetchable) [size=256]
	Capabilities: [80] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: sdhci-pci
___
eser:~ # cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: Hitachi HTS54161 Rev: SB4O
  Type:   Direct-Access                    ANSI  SCSI revision: 05
Host: scsi1 Channel: 00 Id: 01 Lun: 00
  Vendor: Optiarc  Model: DVD RW AD-7530A  Rev: EX31
  Type:   CD-ROM                           ANSI  SCSI revision: 05
Host: scsi2 Channel: 00 Id: 00 Lun: 00
  Vendor: ST350041 Model: 2AS              Rev:     
  Type:   Direct-Access                    ANSI  SCSI revision: 02
Comment 1 Andrew Morton 2011-01-06 21:13:53 UTC 
(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Thu, 6 Jan 2011 20:59:08 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=26242
> 
>            Summary: BUG: unable to handle kernel NULL pointer dereference
>                     at   (null)
>            Product: Memory Management
>            Version: 2.5
>     Kernel Version: 2.6.37
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: low
>           Priority: P1
>          Component: Other
>         AssignedTo: akpm@linux-foundation.org
>         ReportedBy: StMichalke@web.de
>         Regression: No
> 
> 
> My system crashed with the following output:
> 
> ___
> Jan  6 20:06:22 eser kernel: [19365.562621] BUG: unable to handle kernel NULL
> pointer dereference at   (null)
> Jan  6 20:06:22 eser kernel: [19365.562675] IP: [<c022989b>]
> kmap_atomic_prot+0x1b/0x100
> Jan  6 20:06:22 eser kernel: [19365.562709] *pde = 00000000 
> Jan  6 20:06:22 eser kernel: [19365.562726] Oops: 0000 [#1] PREEMPT SMP 
> Jan  6 20:06:22 eser kernel: [19365.562752] last sysfs file:
> /sys/devices/platform/coretemp.0/temp1_input
> Jan  6 20:06:22 eser kernel: [19365.562777] Modules linked in: isofs usblp
> usb_storage uas nls_utf8 udf crc_itu_t fuse ipt_MASQUERADE xt_pkttype
> xt_TCPMSS
> xt_tcpudp ipt_LOG xt_limit iptable_nat nf_nat snd_pcm_oss snd_mixer_oss
> snd_seq
> snd_seq_device xt_NOTRACK ipt_REJECT xt_state iptable_raw iptable_filter
> nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4
> ip_tables
> cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf
> speedstep_lib ip6_tables x_tables loop arc4 ecb b43 snd_hda_codec_si3054
> mac80211 snd_hda_codec_realtek snd_hda_intel r8169 snd_hda_codec cfg80211
> sdhci_pci mii snd_hwdep acer_wmi sdhci snd_pcm rfkill iTCO_wdt yenta_socket
> ssb
> tifm_7xx1 iTCO_vendor_support sg sr_mod mmc_core snd_timer pcmcia_core
> tifm_core cdrom pcspkr wmi pcmcia_rsrc psmouse snd i2c_i801 shpchp evdev
> soundcore battery rng_core ac snd_page_alloc pci_hotplug dm_crypt usbhid hid
> nouveau ttm drm_kms_helper drm uhci_hcd rtc_cmos ata_piix i2c_algo_bit
> i2c_core
> rtc_core cfbcopyarea ehci_hcd usb
> Jan  6 20:06:22 eser kernel: core video cfbimgblt cfbfillrect rtc_lib output
> button nls_base dm_snapshot sha512_generic sha256_generic xts cbc aes_i586
> aes_generic cfq_iosched blk_cgroup btrfs zlib_deflate libcrc32c reiserfs ahci
> libahci libata coretemp hwmon fan thermal processor unix [last unloaded:
> pktcdvd]
> Jan  6 20:06:22 eser kernel: [19365.563014] 
> Jan  6 20:06:22 eser kernel: [19365.563014] Pid: 15675, comm: gimp-2.6 Not
> tainted 2.6.37 #1 Myall2                         /Aspire 9410
> Jan  6 20:06:22 eser kernel: [19365.563014] EIP: 0060:[<c022989b>] EFLAGS:
> 00010202 CPU: 0
> Jan  6 20:06:22 eser kernel: [19365.563014] EIP is at
> kmap_atomic_prot+0x1b/0x100
> Jan  6 20:06:22 eser kernel: [19365.563014] EAX: 00000000 EBX: 00000600 ECX:
> f3a82000 EDX: 00000163
> Jan  6 20:06:23 eser kernel: [19365.563014] ESI: f3a83eac EDI: 00000000 EBP:
> f3a83db8 ESP: f3a83da8
> Jan  6 20:06:23 eser kernel: [19365.563014]  DS: 007b ES: 007b FS: 00d8 GS:
> 0033 SS: 0068
> Jan  6 20:06:23 eser kernel: [19365.563014] Process gimp-2.6 (pid: 15675,
> ti=f3a82000 task=eaf28000 task.ti=f3a82000)
> Jan  6 20:06:23 eser kernel: [19365.563014] Stack:
> Jan  6 20:06:23 eser kernel: [19365.563014]  f3a83dc0 00000600 f3a83eac
> 00000000 f3a83dc0 c022998e f3a83dd8 c0299c0c
> Jan  6 20:06:23 eser kernel: [19365.563014]  e0359240 00000600 00001000
> 00001000 f3a83dfc f828d6da 00000600 00001008
> Jan  6 20:06:23 eser kernel: [19365.563014]  00000002 00000000 00000002
> 00002000 00001608 f3a83ed0 f828e1ff 00001608
> Jan  6 20:06:23 eser kernel: [19365.563014] Call Trace:
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c022998e>] ?
> __kmap_atomic+0xe/0x10
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0299c0c>] ?
> iov_iter_copy_from_user_atomic+0x3c/0x90
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828d6da>] ?
> btrfs_copy_from_user+0x5a/0xb0 [btrfs]
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828e1ff>] ?
> btrfs_file_aio_write+0x52f/0x9c0 [btrfs]
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d0810>] ?
> __mem_cgroup_commit_charge+0x70/0xe0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d672c>] ?
> do_sync_write+0x9c/0xd0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6b15>] ?
> rw_verify_area+0x65/0x100
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6e7a>] ?
> vfs_write+0x9a/0x160
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d8211>] ?
> fget_light+0x91/0xb0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6690>] ?
> do_sync_write+0x0/0xd0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d714d>] ?
> sys_write+0x3d/0x70
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0202e18>] ?
> sysenter_do_call+0x12/0x28
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c04e0000>] ?
> quirk_amd_ide_mode+0x40/0x95
> Jan  6 20:06:23 eser kernel: [19365.563014] Code: 8b 15 4c 6a 6b c0 55 89 e5
> e8
> e2 f8 ff ff 5d c3 55 89 e5 83 ec 10 89 e1 81 e1 00 e0 ff ff 89 5d f4 89 75 f8
> 89 7d fc 83 41 14 01 <8b> 08 c1 e9 1e 69 d9 40 03 00 00 8d 8b c0 42 64 c0 2b
> 8b
> cc 45 
> Jan  6 20:06:23 eser kernel: [19365.563014] EIP: [<c022989b>]
> kmap_atomic_prot+0x1b/0x100 SS:ESP 0068:f3a83da8
> Jan  6 20:06:23 eser kernel: [19365.563014] CR2: 0000000000000000
> Jan  6 20:06:23 eser kernel: [19365.568714] ---[ end trace afc2be06c7d06a71
> ]---
> Jan  6 20:06:23 eser kernel: [19365.568724] note: gimp-2.6[15675] exited with
> preempt_count 2
> ___
> 
> The kernel is an unpatched v2.6.37. I have not seen something like this
> before.

Bugzilla's habit of wordwrapping oops traces is fantastically
irritating.  Please use attachments to avoid this.

Either Peter's new kmap_atomic() stuff blew up or BTRFS is playing
around with a NULL page*.  I'd wager on the latter.

Thanks, I'll ask Rafael and Maciej to track this as a 2.6.36->2.6.37
regression.
Comment 2 Steffen Michalke 2011-01-06 21:25:29 UTC 
Created attachment 42632 [details]
Oops trace

Trace taken from /var/log/messages
Comment 3 Anonymous Emailer 2011-01-07 05:06:05 UTC 
Reply-To: xin.zhong@intel.com

A similar bug has been reported by Kenneth Lakin [kennethlakin@gmail.com] last week. It's related to my check-in (git commit 914ee295af418e936ec20a08c1663eaabe4cd07a). I am looking into it now.

I found one suspicious code in prepage_pages (fs/btrfs/file.c):

        start_pos = pos & ~((u64)root->sectorsize - 1);
        last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;

root->sectorsize is used at first, but PAGE_SIZE is used after it. Do we assume these two values are always the same?

-----Original Message-----
From: linux-btrfs-owner@vger.kernel.org [mailto:linux-btrfs-owner@vger.kernel.org] On Behalf Of Andrew Morton
Sent: Friday, January 07, 2011 5:13 AM
To: StMichalke@web.de
Cc: bugzilla-daemon@bugzilla.kernel.org; Peter Zijlstra; linux-kernel@vger.kernel.org; linux-btrfs@vger.kernel.org
Subject: Re: [Bug 26242] New: BUG: unable to handle kernel NULL pointer dereference at (null)


(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Thu, 6 Jan 2011 20:59:08 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=26242
> 
>            Summary: BUG: unable to handle kernel NULL pointer dereference
>                     at   (null)
>            Product: Memory Management
>            Version: 2.5
>     Kernel Version: 2.6.37
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: low
>           Priority: P1
>          Component: Other
>         AssignedTo: akpm@linux-foundation.org
>         ReportedBy: StMichalke@web.de
>         Regression: No
> 
> 
> My system crashed with the following output:
> 
> ___
> Jan  6 20:06:22 eser kernel: [19365.562621] BUG: unable to handle kernel NULL
> pointer dereference at   (null)
> Jan  6 20:06:22 eser kernel: [19365.562675] IP: [<c022989b>]
> kmap_atomic_prot+0x1b/0x100
> Jan  6 20:06:22 eser kernel: [19365.562709] *pde = 00000000 
> Jan  6 20:06:22 eser kernel: [19365.562726] Oops: 0000 [#1] PREEMPT SMP 
> Jan  6 20:06:22 eser kernel: [19365.562752] last sysfs file:
> /sys/devices/platform/coretemp.0/temp1_input
> Jan  6 20:06:22 eser kernel: [19365.562777] Modules linked in: isofs usblp
> usb_storage uas nls_utf8 udf crc_itu_t fuse ipt_MASQUERADE xt_pkttype
> xt_TCPMSS
> xt_tcpudp ipt_LOG xt_limit iptable_nat nf_nat snd_pcm_oss snd_mixer_oss
> snd_seq
> snd_seq_device xt_NOTRACK ipt_REJECT xt_state iptable_raw iptable_filter
> nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4
> ip_tables
> cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf
> speedstep_lib ip6_tables x_tables loop arc4 ecb b43 snd_hda_codec_si3054
> mac80211 snd_hda_codec_realtek snd_hda_intel r8169 snd_hda_codec cfg80211
> sdhci_pci mii snd_hwdep acer_wmi sdhci snd_pcm rfkill iTCO_wdt yenta_socket
> ssb
> tifm_7xx1 iTCO_vendor_support sg sr_mod mmc_core snd_timer pcmcia_core
> tifm_core cdrom pcspkr wmi pcmcia_rsrc psmouse snd i2c_i801 shpchp evdev
> soundcore battery rng_core ac snd_page_alloc pci_hotplug dm_crypt usbhid hid
> nouveau ttm drm_kms_helper drm uhci_hcd rtc_cmos ata_piix i2c_algo_bit
> i2c_core
> rtc_core cfbcopyarea ehci_hcd usb
> Jan  6 20:06:22 eser kernel: core video cfbimgblt cfbfillrect rtc_lib output
> button nls_base dm_snapshot sha512_generic sha256_generic xts cbc aes_i586
> aes_generic cfq_iosched blk_cgroup btrfs zlib_deflate libcrc32c reiserfs ahci
> libahci libata coretemp hwmon fan thermal processor unix [last unloaded:
> pktcdvd]
> Jan  6 20:06:22 eser kernel: [19365.563014] 
> Jan  6 20:06:22 eser kernel: [19365.563014] Pid: 15675, comm: gimp-2.6 Not
> tainted 2.6.37 #1 Myall2                         /Aspire 9410
> Jan  6 20:06:22 eser kernel: [19365.563014] EIP: 0060:[<c022989b>] EFLAGS:
> 00010202 CPU: 0
> Jan  6 20:06:22 eser kernel: [19365.563014] EIP is at
> kmap_atomic_prot+0x1b/0x100
> Jan  6 20:06:22 eser kernel: [19365.563014] EAX: 00000000 EBX: 00000600 ECX:
> f3a82000 EDX: 00000163
> Jan  6 20:06:23 eser kernel: [19365.563014] ESI: f3a83eac EDI: 00000000 EBP:
> f3a83db8 ESP: f3a83da8
> Jan  6 20:06:23 eser kernel: [19365.563014]  DS: 007b ES: 007b FS: 00d8 GS:
> 0033 SS: 0068
> Jan  6 20:06:23 eser kernel: [19365.563014] Process gimp-2.6 (pid: 15675,
> ti=f3a82000 task=eaf28000 task.ti=f3a82000)
> Jan  6 20:06:23 eser kernel: [19365.563014] Stack:
> Jan  6 20:06:23 eser kernel: [19365.563014]  f3a83dc0 00000600 f3a83eac
> 00000000 f3a83dc0 c022998e f3a83dd8 c0299c0c
> Jan  6 20:06:23 eser kernel: [19365.563014]  e0359240 00000600 00001000
> 00001000 f3a83dfc f828d6da 00000600 00001008
> Jan  6 20:06:23 eser kernel: [19365.563014]  00000002 00000000 00000002
> 00002000 00001608 f3a83ed0 f828e1ff 00001608
> Jan  6 20:06:23 eser kernel: [19365.563014] Call Trace:
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c022998e>] ?
> __kmap_atomic+0xe/0x10
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0299c0c>] ?
> iov_iter_copy_from_user_atomic+0x3c/0x90
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828d6da>] ?
> btrfs_copy_from_user+0x5a/0xb0 [btrfs]
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828e1ff>] ?
> btrfs_file_aio_write+0x52f/0x9c0 [btrfs]
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d0810>] ?
> __mem_cgroup_commit_charge+0x70/0xe0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d672c>] ?
> do_sync_write+0x9c/0xd0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6b15>] ?
> rw_verify_area+0x65/0x100
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6e7a>] ?
> vfs_write+0x9a/0x160
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d8211>] ?
> fget_light+0x91/0xb0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6690>] ?
> do_sync_write+0x0/0xd0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d714d>] ?
> sys_write+0x3d/0x70
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0202e18>] ?
> sysenter_do_call+0x12/0x28
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c04e0000>] ?
> quirk_amd_ide_mode+0x40/0x95
> Jan  6 20:06:23 eser kernel: [19365.563014] Code: 8b 15 4c 6a 6b c0 55 89 e5
> e8
> e2 f8 ff ff 5d c3 55 89 e5 83 ec 10 89 e1 81 e1 00 e0 ff ff 89 5d f4 89 75 f8
> 89 7d fc 83 41 14 01 <8b> 08 c1 e9 1e 69 d9 40 03 00 00 8d 8b c0 42 64 c0 2b
> 8b
> cc 45 
> Jan  6 20:06:23 eser kernel: [19365.563014] EIP: [<c022989b>]
> kmap_atomic_prot+0x1b/0x100 SS:ESP 0068:f3a83da8
> Jan  6 20:06:23 eser kernel: [19365.563014] CR2: 0000000000000000
> Jan  6 20:06:23 eser kernel: [19365.568714] ---[ end trace afc2be06c7d06a71
> ]---
> Jan  6 20:06:23 eser kernel: [19365.568724] note: gimp-2.6[15675] exited with
> preempt_count 2
> ___
> 
> The kernel is an unpatched v2.6.37. I have not seen something like this
> before.

Bugzilla's habit of wordwrapping oops traces is fantastically
irritating.  Please use attachments to avoid this.

Either Peter's new kmap_atomic() stuff blew up or BTRFS is playing
around with a NULL page*.  I'd wager on the latter.

Thanks, I'll ask Rafael and Maciej to track this as a 2.6.36->2.6.37
regression.

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Comment 4 Anonymous Emailer 2011-01-07 07:38:36 UTC 
Reply-To: xin.zhong@intel.com

I have checked latest mkfs code. If page size is 4k. sector size will be 4k too. So at least for x86 hardware, page size and sector size will always be the same.

-----Original Message-----
From: linux-btrfs-owner@vger.kernel.org [mailto:linux-btrfs-owner@vger.kernel.org] On Behalf Of Zhong, Xin
Sent: Friday, January 07, 2011 12:15 PM
To: Andrew Morton; StMichalke@web.de
Cc: bugzilla-daemon@bugzilla.kernel.org; Peter Zijlstra; linux-kernel@vger.kernel.org; linux-btrfs@vger.kernel.org
Subject: RE: [Bug 26242] New: BUG: unable to handle kernel NULL pointer dereference at (null)

A similar bug has been reported by Kenneth Lakin [kennethlakin@gmail.com] last week. It's related to my check-in (git commit 914ee295af418e936ec20a08c1663eaabe4cd07a). I am looking into it now.

I found one suspicious code in prepage_pages (fs/btrfs/file.c):

        start_pos = pos & ~((u64)root->sectorsize - 1);
        last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;

root->sectorsize is used at first, but PAGE_SIZE is used after it. Do we assume these two values are always the same?

-----Original Message-----
From: linux-btrfs-owner@vger.kernel.org [mailto:linux-btrfs-owner@vger.kernel.org] On Behalf Of Andrew Morton
Sent: Friday, January 07, 2011 5:13 AM
To: StMichalke@web.de
Cc: bugzilla-daemon@bugzilla.kernel.org; Peter Zijlstra; linux-kernel@vger.kernel.org; linux-btrfs@vger.kernel.org
Subject: Re: [Bug 26242] New: BUG: unable to handle kernel NULL pointer dereference at (null)


(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Thu, 6 Jan 2011 20:59:08 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=26242
> 
>            Summary: BUG: unable to handle kernel NULL pointer dereference
>                     at   (null)
>            Product: Memory Management
>            Version: 2.5
>     Kernel Version: 2.6.37
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: low
>           Priority: P1
>          Component: Other
>         AssignedTo: akpm@linux-foundation.org
>         ReportedBy: StMichalke@web.de
>         Regression: No
> 
> 
> My system crashed with the following output:
> 
> ___
> Jan  6 20:06:22 eser kernel: [19365.562621] BUG: unable to handle kernel NULL
> pointer dereference at   (null)
> Jan  6 20:06:22 eser kernel: [19365.562675] IP: [<c022989b>]
> kmap_atomic_prot+0x1b/0x100
> Jan  6 20:06:22 eser kernel: [19365.562709] *pde = 00000000 
> Jan  6 20:06:22 eser kernel: [19365.562726] Oops: 0000 [#1] PREEMPT SMP 
> Jan  6 20:06:22 eser kernel: [19365.562752] last sysfs file:
> /sys/devices/platform/coretemp.0/temp1_input
> Jan  6 20:06:22 eser kernel: [19365.562777] Modules linked in: isofs usblp
> usb_storage uas nls_utf8 udf crc_itu_t fuse ipt_MASQUERADE xt_pkttype
> xt_TCPMSS
> xt_tcpudp ipt_LOG xt_limit iptable_nat nf_nat snd_pcm_oss snd_mixer_oss
> snd_seq
> snd_seq_device xt_NOTRACK ipt_REJECT xt_state iptable_raw iptable_filter
> nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4
> ip_tables
> cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf
> speedstep_lib ip6_tables x_tables loop arc4 ecb b43 snd_hda_codec_si3054
> mac80211 snd_hda_codec_realtek snd_hda_intel r8169 snd_hda_codec cfg80211
> sdhci_pci mii snd_hwdep acer_wmi sdhci snd_pcm rfkill iTCO_wdt yenta_socket
> ssb
> tifm_7xx1 iTCO_vendor_support sg sr_mod mmc_core snd_timer pcmcia_core
> tifm_core cdrom pcspkr wmi pcmcia_rsrc psmouse snd i2c_i801 shpchp evdev
> soundcore battery rng_core ac snd_page_alloc pci_hotplug dm_crypt usbhid hid
> nouveau ttm drm_kms_helper drm uhci_hcd rtc_cmos ata_piix i2c_algo_bit
> i2c_core
> rtc_core cfbcopyarea ehci_hcd usb
> Jan  6 20:06:22 eser kernel: core video cfbimgblt cfbfillrect rtc_lib output
> button nls_base dm_snapshot sha512_generic sha256_generic xts cbc aes_i586
> aes_generic cfq_iosched blk_cgroup btrfs zlib_deflate libcrc32c reiserfs ahci
> libahci libata coretemp hwmon fan thermal processor unix [last unloaded:
> pktcdvd]
> Jan  6 20:06:22 eser kernel: [19365.563014] 
> Jan  6 20:06:22 eser kernel: [19365.563014] Pid: 15675, comm: gimp-2.6 Not
> tainted 2.6.37 #1 Myall2                         /Aspire 9410
> Jan  6 20:06:22 eser kernel: [19365.563014] EIP: 0060:[<c022989b>] EFLAGS:
> 00010202 CPU: 0
> Jan  6 20:06:22 eser kernel: [19365.563014] EIP is at
> kmap_atomic_prot+0x1b/0x100
> Jan  6 20:06:22 eser kernel: [19365.563014] EAX: 00000000 EBX: 00000600 ECX:
> f3a82000 EDX: 00000163
> Jan  6 20:06:23 eser kernel: [19365.563014] ESI: f3a83eac EDI: 00000000 EBP:
> f3a83db8 ESP: f3a83da8
> Jan  6 20:06:23 eser kernel: [19365.563014]  DS: 007b ES: 007b FS: 00d8 GS:
> 0033 SS: 0068
> Jan  6 20:06:23 eser kernel: [19365.563014] Process gimp-2.6 (pid: 15675,
> ti=f3a82000 task=eaf28000 task.ti=f3a82000)
> Jan  6 20:06:23 eser kernel: [19365.563014] Stack:
> Jan  6 20:06:23 eser kernel: [19365.563014]  f3a83dc0 00000600 f3a83eac
> 00000000 f3a83dc0 c022998e f3a83dd8 c0299c0c
> Jan  6 20:06:23 eser kernel: [19365.563014]  e0359240 00000600 00001000
> 00001000 f3a83dfc f828d6da 00000600 00001008
> Jan  6 20:06:23 eser kernel: [19365.563014]  00000002 00000000 00000002
> 00002000 00001608 f3a83ed0 f828e1ff 00001608
> Jan  6 20:06:23 eser kernel: [19365.563014] Call Trace:
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c022998e>] ?
> __kmap_atomic+0xe/0x10
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0299c0c>] ?
> iov_iter_copy_from_user_atomic+0x3c/0x90
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828d6da>] ?
> btrfs_copy_from_user+0x5a/0xb0 [btrfs]
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828e1ff>] ?
> btrfs_file_aio_write+0x52f/0x9c0 [btrfs]
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d0810>] ?
> __mem_cgroup_commit_charge+0x70/0xe0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d672c>] ?
> do_sync_write+0x9c/0xd0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6b15>] ?
> rw_verify_area+0x65/0x100
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6e7a>] ?
> vfs_write+0x9a/0x160
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d8211>] ?
> fget_light+0x91/0xb0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6690>] ?
> do_sync_write+0x0/0xd0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d714d>] ?
> sys_write+0x3d/0x70
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0202e18>] ?
> sysenter_do_call+0x12/0x28
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c04e0000>] ?
> quirk_amd_ide_mode+0x40/0x95
> Jan  6 20:06:23 eser kernel: [19365.563014] Code: 8b 15 4c 6a 6b c0 55 89 e5
> e8
> e2 f8 ff ff 5d c3 55 89 e5 83 ec 10 89 e1 81 e1 00 e0 ff ff 89 5d f4 89 75 f8
> 89 7d fc 83 41 14 01 <8b> 08 c1 e9 1e 69 d9 40 03 00 00 8d 8b c0 42 64 c0 2b
> 8b
> cc 45 
> Jan  6 20:06:23 eser kernel: [19365.563014] EIP: [<c022989b>]
> kmap_atomic_prot+0x1b/0x100 SS:ESP 0068:f3a83da8
> Jan  6 20:06:23 eser kernel: [19365.563014] CR2: 0000000000000000
> Jan  6 20:06:23 eser kernel: [19365.568714] ---[ end trace afc2be06c7d06a71
> ]---
> Jan  6 20:06:23 eser kernel: [19365.568724] note: gimp-2.6[15675] exited with
> preempt_count 2
> ___
> 
> The kernel is an unpatched v2.6.37. I have not seen something like this
> before.

Bugzilla's habit of wordwrapping oops traces is fantastically
irritating.  Please use attachments to avoid this.

Either Peter's new kmap_atomic() stuff blew up or BTRFS is playing
around with a NULL page*.  I'd wager on the latter.

Thanks, I'll ask Rafael and Maciej to track this as a 2.6.36->2.6.37
regression.

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Comment 5 Anonymous Emailer 2011-01-18 06:39:19 UTC 
Reply-To: xin.zhong@intel.com

I believe below check-in will fix this problem. Thanks for Yan Zheng's help!

http://www.spinics.net/lists/linux-btrfs/msg08051.html

-----Original Message-----
From: Zhong, Xin 
Sent: Friday, January 07, 2011 2:46 PM
To: Zhong, Xin; Andrew Morton; StMichalke@web.de
Cc: bugzilla-daemon@bugzilla.kernel.org; Peter Zijlstra; linux-kernel@vger.kernel.org; linux-btrfs@vger.kernel.org
Subject: RE: [Bug 26242] New: BUG: unable to handle kernel NULL pointer dereference at (null)

I have checked latest mkfs code. If page size is 4k. sector size will be 4k too. So at least for x86 hardware, page size and sector size will always be the same.

-----Original Message-----
From: linux-btrfs-owner@vger.kernel.org [mailto:linux-btrfs-owner@vger.kernel.org] On Behalf Of Zhong, Xin
Sent: Friday, January 07, 2011 12:15 PM
To: Andrew Morton; StMichalke@web.de
Cc: bugzilla-daemon@bugzilla.kernel.org; Peter Zijlstra; linux-kernel@vger.kernel.org; linux-btrfs@vger.kernel.org
Subject: RE: [Bug 26242] New: BUG: unable to handle kernel NULL pointer dereference at (null)

A similar bug has been reported by Kenneth Lakin [kennethlakin@gmail.com] last week. It's related to my check-in (git commit 914ee295af418e936ec20a08c1663eaabe4cd07a). I am looking into it now.

I found one suspicious code in prepage_pages (fs/btrfs/file.c):

        start_pos = pos & ~((u64)root->sectorsize - 1);
        last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;

root->sectorsize is used at first, but PAGE_SIZE is used after it. Do we assume these two values are always the same?

-----Original Message-----
From: linux-btrfs-owner@vger.kernel.org [mailto:linux-btrfs-owner@vger.kernel.org] On Behalf Of Andrew Morton
Sent: Friday, January 07, 2011 5:13 AM
To: StMichalke@web.de
Cc: bugzilla-daemon@bugzilla.kernel.org; Peter Zijlstra; linux-kernel@vger.kernel.org; linux-btrfs@vger.kernel.org
Subject: Re: [Bug 26242] New: BUG: unable to handle kernel NULL pointer dereference at (null)


(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Thu, 6 Jan 2011 20:59:08 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=26242
> 
>            Summary: BUG: unable to handle kernel NULL pointer dereference
>                     at   (null)
>            Product: Memory Management
>            Version: 2.5
>     Kernel Version: 2.6.37
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: low
>           Priority: P1
>          Component: Other
>         AssignedTo: akpm@linux-foundation.org
>         ReportedBy: StMichalke@web.de
>         Regression: No
> 
> 
> My system crashed with the following output:
> 
> ___
> Jan  6 20:06:22 eser kernel: [19365.562621] BUG: unable to handle kernel NULL
> pointer dereference at   (null)
> Jan  6 20:06:22 eser kernel: [19365.562675] IP: [<c022989b>]
> kmap_atomic_prot+0x1b/0x100
> Jan  6 20:06:22 eser kernel: [19365.562709] *pde = 00000000 
> Jan  6 20:06:22 eser kernel: [19365.562726] Oops: 0000 [#1] PREEMPT SMP 
> Jan  6 20:06:22 eser kernel: [19365.562752] last sysfs file:
> /sys/devices/platform/coretemp.0/temp1_input
> Jan  6 20:06:22 eser kernel: [19365.562777] Modules linked in: isofs usblp
> usb_storage uas nls_utf8 udf crc_itu_t fuse ipt_MASQUERADE xt_pkttype
> xt_TCPMSS
> xt_tcpudp ipt_LOG xt_limit iptable_nat nf_nat snd_pcm_oss snd_mixer_oss
> snd_seq
> snd_seq_device xt_NOTRACK ipt_REJECT xt_state iptable_raw iptable_filter
> nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4
> ip_tables
> cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf
> speedstep_lib ip6_tables x_tables loop arc4 ecb b43 snd_hda_codec_si3054
> mac80211 snd_hda_codec_realtek snd_hda_intel r8169 snd_hda_codec cfg80211
> sdhci_pci mii snd_hwdep acer_wmi sdhci snd_pcm rfkill iTCO_wdt yenta_socket
> ssb
> tifm_7xx1 iTCO_vendor_support sg sr_mod mmc_core snd_timer pcmcia_core
> tifm_core cdrom pcspkr wmi pcmcia_rsrc psmouse snd i2c_i801 shpchp evdev
> soundcore battery rng_core ac snd_page_alloc pci_hotplug dm_crypt usbhid hid
> nouveau ttm drm_kms_helper drm uhci_hcd rtc_cmos ata_piix i2c_algo_bit
> i2c_core
> rtc_core cfbcopyarea ehci_hcd usb
> Jan  6 20:06:22 eser kernel: core video cfbimgblt cfbfillrect rtc_lib output
> button nls_base dm_snapshot sha512_generic sha256_generic xts cbc aes_i586
> aes_generic cfq_iosched blk_cgroup btrfs zlib_deflate libcrc32c reiserfs ahci
> libahci libata coretemp hwmon fan thermal processor unix [last unloaded:
> pktcdvd]
> Jan  6 20:06:22 eser kernel: [19365.563014] 
> Jan  6 20:06:22 eser kernel: [19365.563014] Pid: 15675, comm: gimp-2.6 Not
> tainted 2.6.37 #1 Myall2                         /Aspire 9410
> Jan  6 20:06:22 eser kernel: [19365.563014] EIP: 0060:[<c022989b>] EFLAGS:
> 00010202 CPU: 0
> Jan  6 20:06:22 eser kernel: [19365.563014] EIP is at
> kmap_atomic_prot+0x1b/0x100
> Jan  6 20:06:22 eser kernel: [19365.563014] EAX: 00000000 EBX: 00000600 ECX:
> f3a82000 EDX: 00000163
> Jan  6 20:06:23 eser kernel: [19365.563014] ESI: f3a83eac EDI: 00000000 EBP:
> f3a83db8 ESP: f3a83da8
> Jan  6 20:06:23 eser kernel: [19365.563014]  DS: 007b ES: 007b FS: 00d8 GS:
> 0033 SS: 0068
> Jan  6 20:06:23 eser kernel: [19365.563014] Process gimp-2.6 (pid: 15675,
> ti=f3a82000 task=eaf28000 task.ti=f3a82000)
> Jan  6 20:06:23 eser kernel: [19365.563014] Stack:
> Jan  6 20:06:23 eser kernel: [19365.563014]  f3a83dc0 00000600 f3a83eac
> 00000000 f3a83dc0 c022998e f3a83dd8 c0299c0c
> Jan  6 20:06:23 eser kernel: [19365.563014]  e0359240 00000600 00001000
> 00001000 f3a83dfc f828d6da 00000600 00001008
> Jan  6 20:06:23 eser kernel: [19365.563014]  00000002 00000000 00000002
> 00002000 00001608 f3a83ed0 f828e1ff 00001608
> Jan  6 20:06:23 eser kernel: [19365.563014] Call Trace:
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c022998e>] ?
> __kmap_atomic+0xe/0x10
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0299c0c>] ?
> iov_iter_copy_from_user_atomic+0x3c/0x90
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828d6da>] ?
> btrfs_copy_from_user+0x5a/0xb0 [btrfs]
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<f828e1ff>] ?
> btrfs_file_aio_write+0x52f/0x9c0 [btrfs]
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d0810>] ?
> __mem_cgroup_commit_charge+0x70/0xe0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d672c>] ?
> do_sync_write+0x9c/0xd0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6b15>] ?
> rw_verify_area+0x65/0x100
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6e7a>] ?
> vfs_write+0x9a/0x160
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d8211>] ?
> fget_light+0x91/0xb0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d6690>] ?
> do_sync_write+0x0/0xd0
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c02d714d>] ?
> sys_write+0x3d/0x70
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c0202e18>] ?
> sysenter_do_call+0x12/0x28
> Jan  6 20:06:23 eser kernel: [19365.563014]  [<c04e0000>] ?
> quirk_amd_ide_mode+0x40/0x95
> Jan  6 20:06:23 eser kernel: [19365.563014] Code: 8b 15 4c 6a 6b c0 55 89 e5
> e8
> e2 f8 ff ff 5d c3 55 89 e5 83 ec 10 89 e1 81 e1 00 e0 ff ff 89 5d f4 89 75 f8
> 89 7d fc 83 41 14 01 <8b> 08 c1 e9 1e 69 d9 40 03 00 00 8d 8b c0 42 64 c0 2b
> 8b
> cc 45 
> Jan  6 20:06:23 eser kernel: [19365.563014] EIP: [<c022989b>]
> kmap_atomic_prot+0x1b/0x100 SS:ESP 0068:f3a83da8
> Jan  6 20:06:23 eser kernel: [19365.563014] CR2: 0000000000000000
> Jan  6 20:06:23 eser kernel: [19365.568714] ---[ end trace afc2be06c7d06a71
> ]---
> Jan  6 20:06:23 eser kernel: [19365.568724] note: gimp-2.6[15675] exited with
> preempt_count 2
> ___
> 
> The kernel is an unpatched v2.6.37. I have not seen something like this
> before.

Bugzilla's habit of wordwrapping oops traces is fantastically
irritating.  Please use attachments to avoid this.

Either Peter's new kmap_atomic() stuff blew up or BTRFS is playing
around with a NULL page*.  I'd wager on the latter.

Thanks, I'll ask Rafael and Maciej to track this as a 2.6.36->2.6.37
regression.

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Comment 6 Florian Mickler 2011-01-29 20:36:10 UTC 
Patch: http://www.spinics.net/lists/linux-btrfs/msg08051.html
Comment 7 Rafael J. Wysocki 2011-02-12 23:12:33 UTC 
Fixed by commit 3a90983dbdcb2f4f48c0d771d8e5b4d88f27fae6 .
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