Bug 12920 - savage: mmap2 of /dev/dri/card0 fails with EAGAIN since 2.6.29-rc6
savage: mmap2 of /dev/dri/card0 fails with EAGAIN since 2.6.29-rc6
Status: CLOSED CODE_FIX
Product: Platform Specific/Hardware
Classification: Unclassified
Component: i386
All Linux
: P1 normal
Assigned To: platform_i386
:
Depends on:
Blocks: 12398
  Show dependency treegraph
 
Reported: 2009-03-23 08:58 UTC by Alex Villacis Lasso
Modified: 2009-04-06 19:53 UTC (History)
4 users (show)

See Also:
Kernel Version: 2.6.29-rc6
Tree: Mainline
Regression: Yes


Attachments
Kernel configuration which succeeds in 2.6.29-rc5 and fails in 2.6.29-rc6 and up. (85.41 KB, text/plain)
2009-03-23 08:59 UTC, Alex Villacis Lasso
Details
dmesg output for 2.6.29-rc8 which also shows the bug. (33.44 KB, text/plain)
2009-03-23 09:01 UTC, Alex Villacis Lasso
Details
Full xorg log when bug happens. (31.36 KB, text/plain)
2009-03-23 09:01 UTC, Alex Villacis Lasso
Details
strace output that shows EAGAIN as error from mmap2 (913.20 KB, text/plain)
2009-03-23 09:05 UTC, Alex Villacis Lasso
Details
strace output that shows EAGAIN as error from mmap2 (913.20 KB, text/plain)
2009-03-23 09:07 UTC, Alex Villacis Lasso
Details

Description Alex Villacis Lasso 2009-03-23 08:58:05 UTC
Latest working kernel version: 2.6.29-rc5
Earliest failing kernel version: 2.6.29-rc6
Distribution: Fedora 10 i386
Hardware Environment:

/proc/cpuinfo:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 1
model name	: Intel(R) Pentium(R) 4 CPU 1.70GHz
stepping	: 2
cpu MHz		: 1700.047
cache size	: 256 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pebs bts
bogomips	: 3400.09
clflush size	: 64
power management:

/proc/iomem:
00000000-0000ffff : reserved
00010000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000cbfff : Video ROM
000f0000-000fffff : reserved
  000f0000-000fffff : System ROM
00100000-1f7effff : System RAM
  00400000-0068676c : Kernel code
  0068676d-007eca67 : Kernel data
  00838000-00c3fd83 : Kernel bss
1f7f0000-1f7f7fff : ACPI Tables
1f7f8000-1f7fffff : ACPI Non-volatile Storage
ceb00000-debfffff : PCI Bus 0000:01
  d0000000-d7ffffff : 0000:01:00.0
    d0000000-d06effff : vesafb
ded00000-deefffff : PCI Bus 0000:01
  dee70000-dee7ffff : 0000:01:00.0
  dee80000-deefffff : 0000:01:00.0
df000000-df7fffff : 0000:00:09.0
dffe0000-dffe7fff : 0000:00:09.0
dfffee00-dfffeeff : 0000:00:12.0
  dfffee00-dfffeeff : via-rhine
dfffef00-dfffefff : 0000:00:10.3
  dfffef00-dfffefff : ehci_hcd
dffff000-dfffffff : 0000:00:09.0
e0000000-efffffff : 0000:00:00.0
fec00000-fec00fff : reserved
fee00000-fee00fff : Local APIC
  fee00000-fee00fff : reserved
fff80000-ffffffff : reserved

/proc/ioports:
0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-0060 : keyboard
0064-0064 : keyboard
0070-0071 : rtc0
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : 0000:00:11.1
  0170-0177 : pata_via
01f0-01f7 : 0000:00:11.1
  01f0-01f7 : pata_via
0201-0208 : ns558-pnp
0295-0296 : it87
  0295-0296 : it87
0330-0331 : MPU401 UART
0376-0376 : 0000:00:11.1
  0376-0376 : pata_via
0378-037a : parport0
03c0-03df : vesafb
03f2-03f2 : floppy
03f4-03f5 : floppy
03f6-03f6 : 0000:00:11.1
  03f6-03f6 : pata_via
03f7-03f7 : floppy
03f8-03ff : serial
0400-040f : 0000:00:11.0
  0400-0407 : vt596_smbus
0800-087f : 0000:00:11.0
  0800-0803 : ACPI PM1a_EVT_BLK
  0804-0805 : ACPI PM1a_CNT_BLK
  0808-080b : ACPI PM_TMR
  0810-0815 : ACPI CPU throttle
  0820-0823 : ACPI GPE0_BLK
0cf8-0cff : PCI conf1
cc00-ccff : 0000:00:12.0
  cc00-ccff : via-rhine
d000-d0ff : 0000:00:11.5
  d000-d0ff : VIA8233
d400-d41f : 0000:00:10.0
  d400-d41f : uhci_hcd
d800-d81f : 0000:00:10.1
  d800-d81f : uhci_hcd
dc00-dc1f : 0000:00:10.2
  dc00-dc1f : uhci_hcd
e000-e007 : 0000:00:0b.0
e400-e407 : 0000:00:0b.0
  e400-e402 : parport1
  e403-e407 : parport1
e800-e81f : 0000:00:0b.0
  e800-e807 : serial
  e808-e80f : serial
ec00-ecff : 0000:00:09.0
fc00-fc0f : 0000:00:11.1
  fc00-fc0f : pata_via

lspci -vvv
00:00.0 Host bridge: VIA Technologies, Inc. P4M266 Host Bridge
	Subsystem: VIA Technologies, Inc. Device 0000
	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: 8
	Region 0: Memory at e0000000 (32-bit, prefetchable) [size=256M]
	Capabilities: [a0] AGP version 2.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP+ GART64- 64bit- FW- Rate=x4
	Capabilities: [c0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: agpgart-via
	Kernel modules: via-agp

00:01.0 PCI bridge: VIA Technologies, Inc. VT8633 [Apollo Pro266 AGP] (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=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR+ INTx-
	Latency: 0
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: 0000f000-00000fff
	Memory behind bridge: ded00000-deefffff
	Prefetchable memory behind bridge: ceb00000-debfffff
	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: [80] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:09.0 VGA compatible controller: Oak Technology, Inc OTI-64111 [Spitfire] (rev 10) (prog-if 00 [VGA controller])
	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 A routed to IRQ 11
	Region 0: Memory at dffff000 (32-bit, non-prefetchable) [disabled] [size=4K]
	Region 1: Memory at df000000 (32-bit, non-prefetchable) [disabled] [size=8M]
	Region 2: I/O ports at ec00 [disabled] [size=256]
	Expansion ROM at dffe0000 [disabled] [size=32K]

00:0b.0 Serial controller: Timedia Technology Co Ltd PCI2S550 (Dual 16550 UART) (rev 01) (prog-if 02 [16550])
	Subsystem: Timedia Technology Co Ltd Device 5079
	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 A routed to IRQ 11
	Region 0: I/O ports at e800 [size=32]
	Region 2: I/O ports at e400 [size=8]
	Region 3: I/O ports at e000 [size=8]
	Kernel driver in use: serial
	Kernel modules: parport_pc

00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) (prog-if 00 [UHCI])
	Subsystem: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
	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: 32, Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 5
	Region 4: I/O ports at d400 [size=32]
	Capabilities: [80] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci-hcd

00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) (prog-if 00 [UHCI])
	Subsystem: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
	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: 32, Cache Line Size: 32 bytes
	Interrupt: pin B routed to IRQ 11
	Region 4: I/O ports at d800 [size=32]
	Capabilities: [80] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci-hcd

00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) (prog-if 00 [UHCI])
	Subsystem: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
	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: 32, Cache Line Size: 32 bytes
	Interrupt: pin C routed to IRQ 5
	Region 4: I/O ports at dc00 [size=32]
	Capabilities: [80] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci-hcd

00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82) (prog-if 20 [EHCI])
	Subsystem: VIA Technologies, Inc. USB 2.0
	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: 32, Cache Line Size: 128 bytes
	Interrupt: pin D routed to IRQ 11
	Region 0: Memory at dfffef00 (32-bit, non-prefetchable) [size=256]
	Capabilities: [80] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME+
	Kernel driver in use: ehci_hcd
	Kernel modules: ehci-hcd

00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
	Subsystem: VIA Technologies, Inc. KT4AV motherboard
	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: [c0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel modules: via-ircc, i2c-viapro

00:11.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) (prog-if 8a [Master SecP PriP])
	Subsystem: VIA Technologies, Inc. VT82C586/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE
	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: 32
	Interrupt: pin A routed to IRQ 255
	Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
	Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable) [size=1]
	Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
	Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1]
	Region 4: I/O ports at fc00 [size=16]
	Capabilities: [c0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: pata_via

00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 50)
	Subsystem: VIA Technologies, Inc. K7VT2 motherboard
	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 C routed to IRQ 5
	Region 0: I/O ports at d000 [size=256]
	Capabilities: [c0] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: VIA 82xx Audio
	Kernel modules: snd-via82xx

00:12.0 Ethernet controller: VIA Technologies, Inc. VT6102 [Rhine-II] (rev 74)
	Subsystem: VIA Technologies, Inc. VT6102 [Rhine II] Embeded Ethernet Controller on VT8235
	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: 32 (750ns min, 2000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 5
	Region 0: I/O ports at cc00 [size=256]
	Region 1: Memory at dfffee00 (32-bit, non-prefetchable) [size=256]
	Capabilities: [40] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: via-rhine
	Kernel modules: via-rhine

01:00.0 VGA compatible controller: S3 Inc. VT8375 [ProSavage8 KM266/KL266] (prog-if 00 [VGA controller])
	Subsystem: S3 Inc. VT8375 [ProSavage8 KM266/KL266]
	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: 32 (1000ns min, 63750ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 5
	Region 0: Memory at dee80000 (32-bit, non-prefetchable) [size=512K]
	Region 1: Memory at d0000000 (32-bit, prefetchable) [size=128M]
	Expansion ROM at dee70000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 2
		Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [80] AGP version 2.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA- ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x4
		Command: RQ=32 ArqSz=0 Cal=0 SBA- AGP+ GART64- 64bit- FW- Rate=x4
	Kernel modules: savagefb



Software Environment:
Linux version 2.6.29-rc8 (alex@karlalex.palosanto.com) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #1 PREEMPT Sat Mar 21 13:57:36 ECT 2009
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.
 
Linux karlalex.palosanto.com 2.6.29-rc8 #1 PREEMPT Sat Mar 21 13:57:36 ECT 2009 i686 i686 i386 GNU/Linux
 
Gnu C                  4.3.2
Gnu make               3.81
binutils               2.18.50.0.9
util-linux             2.14.1
mount                  support
module-init-tools      3.5
e2fsprogs              1.41.4
pcmciautils            014
quota-tools            3.16.
PPP                    2.4.4
Linux C Library        2.9
Dynamic linker (ldd)   2.9
Procps                 3.2.7
Net-tools              1.60
Kbd                    1.12
oprofile               0.9.4
Sh-utils               6.12
udev                   127
wireless-tools         29
Modules Loaded         usb_storage ipv6 fuse savage drm eeprom sco bridge stp llc bnep l2cap bluetooth it87 hwmon_vid hwmon vfat fat dm_multipath uinput ppdev snd_via82xx snd_ac97_codec ac97_bus snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_pcm_oss snd_mixer_oss floppy snd_pcm i2c_viapro pcspkr sr_mod via_rhine i2c_core snd_timer mii snd_page_alloc cdrom via_ircc irda crc_ccitt snd_mpu401 snd_mpu401_uart snd_rawmidi snd_seq_device ns558 snd gameport soundcore parport_pc parport via_agp uhci_hcd ohci_hcd ehci_hcd usbcore

Problem Description:
A regression was introduced between 2.6.29-rc5 and -rc6 that results in an attempt to mmap2 on /dev/dri/card0 (ProSavageDDRK) to fail with EAGAIN. This hits the X server and results in broken DRI/Mesa support.


Steps to reproduce:
Get 2.6.29-rc6 or higher and a Savage chipset (don't know about other chipsets)
Attempt to start X
Report DRI support (from Xorg.0.log)

When the bug hits, the following appears on the X log:
----------------
(II) [drm] loaded kernel module for "savage" driver.
(II) [drm] DRM interface version 1.3
(II) [drm] DRM open master succeeded.
(II) SAVAGE(0): [drm] Using the DRM lock SAREA also for drawables.
(II) SAVAGE(0): [drm] framebuffer handle = 0xd0000000
(II) SAVAGE(0): [drm] added 1 reserved context for kernel
(II) SAVAGE(0): X context handle = 0x1
(II) SAVAGE(0): [drm] installed DRM signal handler
(II) SAVAGE(0): [agp] Mode 0x1f000207 [AGP 0x1106/0x3148; Card 0x5333/0x8d04]
(II) SAVAGE(0): [agp] 16384 kB allocated with handle 0x00000001
(II) SAVAGE(0): [agp] command DMA handle = 0xe0000000
(II) SAVAGE(0): [agp] agpTextures handle = 0xe0100000
(II) SAVAGE(0): [drm] aperture handle = 0xd2000000
(II) SAVAGE(0): [drm] Enabling ShadowStatus for DRI.
(II) SAVAGE(0): [drm] Status handle = 0x18a12000
(EE) SAVAGE(0): [drm] Could not map status page
(II) SAVAGE(0): [drm] removed 1 reserved context for kernel
(II) SAVAGE(0): [drm] unmapping 8192 bytes of SAREA 0xe0010000 at 0xb803a000
(II) SAVAGE(0): [drm] Closed DRM master.
(II) SAVAGE(0): Resetting ShadowStatus.
(EE) SAVAGE(0): DRI isn't enabled
----------------

A strace of the Xorg process shows:
open("/dev/dri/card0", O_RDWR|O_LARGEFILE) = 12
write(0, "drmOpenDevice: open result is 12,"..., 39) = 39
ioctl(12, DEVFSDIOC_GET_PROTO_REV, 0x9f89180) = 0
ioctl(12, DEVFSDIOC_GET_PROTO_REV, 0x9f89180) = 0
...
ioctl(12, 0xc0186415, 0xbfe7c678)       = 0
write(0, "(II) SAVAGE(0): [drm] Status hand"..., 49) = 49
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 12, 0x14335) = -1 EAGAIN (Resource temporarily unavailable)
write(2, "(EE) SAVAGE(0): [drm] Could not m"..., 48) = 48
write(0, "(EE) SAVAGE(0): [drm] Could not m"..., 48) = 48
munmap(0xffffffff, 4096)                = -1 EINVAL (Invalid argument)
Comment 1 Alex Villacis Lasso 2009-03-23 08:59:49 UTC
Created attachment 20642 [details]
Kernel configuration which succeeds in 2.6.29-rc5 and fails in 2.6.29-rc6 and up.
Comment 2 Alex Villacis Lasso 2009-03-23 09:01:19 UTC
Created attachment 20643 [details]
dmesg output for 2.6.29-rc8 which also shows the bug.

I do not see any message that could point to some particular problem, because similar messages appear in rc5, but I could be wrong.
Comment 3 Alex Villacis Lasso 2009-03-23 09:01:53 UTC
Created attachment 20644 [details]
Full xorg log when bug happens.
Comment 4 Alex Villacis Lasso 2009-03-23 09:05:11 UTC
Created attachment 20645 [details]
strace output that shows EAGAIN as error from mmap2
Comment 5 Alex Villacis Lasso 2009-03-23 09:07:16 UTC
Created attachment 20646 [details]
strace output that shows EAGAIN as error from mmap2
Comment 6 Alex Villacis Lasso 2009-03-23 09:08:50 UTC
Sorry for double-posting the attachment. 

I attempted to bisect this bug over the weekend. This is what I got so far:

git bisect start
# bad: [fec6c6fec3e20637bee5d276fb61dd8b49a3f9cc] Linux 2.6.29-rc7
git bisect bad fec6c6fec3e20637bee5d276fb61dd8b49a3f9cc
# good: [d2f8d7ee1a9b4650b4e43325b321801264f7c37a] Linux 2.6.29-rc5
git bisect good d2f8d7ee1a9b4650b4e43325b321801264f7c37a
# bad: [ddf9499b3d1e655f212f22b0a703506fcac90b25] x86, Voyager: fix compile by lifting the degeneracy of phys_cpu_present_map
git bisect bad ddf9499b3d1e655f212f22b0a703506fcac90b25
# bad: [ba95fd47d177d46743ad94055908d22840370e06] Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
git bisect bad ba95fd47d177d46743ad94055908d22840370e06
# good: [48c0d9ece360ff6001e2ae36aa9b34446d0388a8] Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
git bisect good 48c0d9ece360ff6001e2ae36aa9b34446d0388a8
# bad: [82eb03cfd862a65363fa2826de0dbd5474cfe5e2] cciss: PCI power management reset for kexec
git bisect bad 82eb03cfd862a65363fa2826de0dbd5474cfe5e2
# good: [8ce9a75a307e142a8871c649627555e0e4a1eefb] Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
git bisect good 8ce9a75a307e142a8871c649627555e0e4a1eefb

Comment 7 Alan 2009-03-23 10:44:38 UTC
I'd take a bet on this being the PAT/mmap breakage again
Comment 8 Ingo Molnar 2009-03-24 02:45:15 UTC
testing latest -tip would be useful:

  http://people.redhat.com/mingo/tip.git/README

in particular the fix below has a chance of resolving it.

	Ingo

---------------->
From 9cdec049389ce2c324fd1ec508a71528a27d4a07 Mon Sep 17 00:00:00 2001
From: Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com>
Date: Mon, 23 Mar 2009 12:07:20 -0700
Subject: [PATCH] x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot

While looking at the issue in the thread:

  http://marc.info/?l=dri-devel&m=123606627824556&w=2

noticed a bug in pci PAT code and memory type setting.

PCI mmap code did not set the proper protection in vma, when it
inherited protection in reserve_memtype. This bug only affects
the case where there exists a WC mapping before X does an mmap
with /proc or /sys pci interface. This will cause X userlevel
mmap from /proc or /sysfs to fail on fork.

Reported-by: Kevin Winchester <kjwinchester@gmail.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Dave Airlie <airlied@redhat.com>
Cc: <stable@kernel.org>
LKML-Reference: <20090323190720.GA16831@linux-os.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/pci/i386.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 5ead808..f234a37 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -319,6 +319,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 			return -EINVAL;
 		}
 		flags = new_flags;
+		vma->vm_page_prot = __pgprot(
+			(pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK) |
+			flags);
 	}
 
 	if (((vma->vm_pgoff < max_low_pfn_mapped) ||

Comment 9 Alan 2009-03-24 10:57:37 UTC
(pwc has a similar problem btw)
Comment 10 Alex Villacis Lasso 2009-03-25 16:21:30 UTC
> 
> diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
> index 5ead808..f234a37 100644
> --- a/arch/x86/pci/i386.c
> +++ b/arch/x86/pci/i386.c
> @@ -319,6 +319,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct
> vm_area_struct *vma,
>              return -EINVAL;
>          }
>          flags = new_flags;
> +        vma->vm_page_prot = __pgprot(
> +            (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK) |
> +            flags);
>      }
> 
>      if (((vma->vm_pgoff < max_low_pfn_mapped) ||

Compiling a full kernel takes too long in my machine (over 6 hours), so I tried manually applying this patch on an already compiled 2.6.29-rc8 checkout. However, it did not fix the problem - the symptoms remain exactly the same.
Comment 11 Mario Chacon 2009-03-27 12:02:17 UTC
I have the same problem using archlinux and the latest 2.26.9 kernel of the the distro, I will waiting that the distribution apply the patch. It's work the patch?
Comment 12 Alex Villacis Lasso 2009-03-30 16:00:59 UTC
Bisection points me to the following:

be03d9e8022030c16abf534e33e185bfc3d40eef is first bad commit
commit be03d9e8022030c16abf534e33e185bfc3d40eef
Author: Suresh Siddha <suresh.b.siddha@intel.com>
Date:   Wed Feb 11 11:20:23 2009 -0800

    x86, pat: fix warn_on_once() while mapping 0-1MB range with /dev/mem

    Jeff Mahoney reported:

    > With Suse's hwinfo tool, on -tip:
    > WARNING: at arch/x86/mm/pat.c:637 reserve_pfn_range+0x5b/0x26d()

    reserve_pfn_range() is not tracking the memory range below 1MB
    as non-RAM and as such is inconsistent with similar checks in
    reserve_memtype() and free_memtype()

    Rename the pagerange_is_ram() to pat_pagerange_is_ram() and add the
    "track legacy 1MB region as non RAM" condition.

    And also, fix reserve_pfn_range() to return -EINVAL, when the pfn
    range is RAM. This is to be consistent with this API design.

    Reported-and-tested-by: Jeff Mahoney <jeffm@suse.com>
    Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
    Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>

:040000 040000 feb3bf21d762e885284cb1bedb5d2c6c0d16811b b4c2143775386ce15dd49b6749c1f7913d8beb00 M      arch

I have confirmed that reverting this one patch fixes the issue in both 2.6.29-rc8 and 2.6.29 final.
Comment 13 Alex Villacis Lasso 2009-03-31 23:09:09 UTC
Is there anything else I could do to help fix this problem?
Comment 14 Alex Villacis Lasso 2009-03-31 23:28:52 UTC
Going to try re-applying failing commit, then applying http://marc.info/?l=linux-kernel&m=123691716419111&w=2 to see whether this fixes the issue too.
Comment 15 Suresh B Siddha 2009-04-04 00:25:31 UTC
Fix for this issue (http://marc.info/?l=linux-kernel&m=123854290308079&w=2) went into linux-2.6.29.1. Can we please check 2.6.29.1 and close this bug if the issue is resolved?
Comment 16 Alex Villacis Lasso 2009-04-06 16:13:03 UTC
The 2.6.29.1 patch indeed fixes this bug for me. Marking as FIXED.
Comment 17 Mario Chacon 2009-04-06 17:49:35 UTC
The 2.6.29.1 patch indeed fixes this bug for me. Marking as FIXED.

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