Created attachment 33512 [details] Kernel config (gzipped) I was trying to get pppoe working (the 'pon' command seemed to hang) and then this happened: Oct 13 20:57:07 bes kernel: BUG: unable to handle kernel NULL pointer dereference at (null) Oct 13 20:57:07 bes kernel: IP: [<c1241674>] skb_dequeue+0x24/0x40 Oct 13 20:57:07 bes kernel: *pde = 00000000 Oct 13 20:57:07 bes kernel: Oops: 0002 [#1] Oct 13 20:57:07 bes kernel: last sysfs file: /sys/devices/virtual/net/ppp0/uevent Oct 13 20:57:07 bes kernel: Modules linked in: xt_TCPMSS xt_tcpmss xt_tcpudp iptable_mangle pppoe pppox ppp_generic slhc cpufreq_conservative cpufreq_userspace cpufreq_powersave fuse ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan ehci_hcd button i2c_core Oct 13 20:57:07 bes kernel: Oct 13 20:57:07 bes kernel: Pid: 5495, comm: pppd Not tainted 2.6.36-rc7 #12 VX800 /VX800 Oct 13 20:57:07 bes kernel: EIP: 0060:[<c1241674>] EFLAGS: 00010046 CPU: 0 Oct 13 20:57:07 bes kernel: EIP is at skb_dequeue+0x24/0x40 Oct 13 20:57:07 bes kernel: EAX: 00000000 EBX: 00000202 ECX: f6ba4cc0 EDX: 00000000 Oct 13 20:57:07 bes kernel: ESI: f6c93bc0 EDI: f6adfee4 EBP: f6ade000 ESP: f6adfe68 Oct 13 20:57:07 bes kernel: DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 Oct 13 20:57:07 bes kernel: Process pppd (pid: 5495, ti=f6ade000 task=f70f2200 task.ti=f6ade000) Oct 13 20:57:07 bes kernel: Stack: Oct 13 20:57:07 bes kernel: f68836c4 c1243a94 f68836c0 f866825b 00000000 f72e4a00 f72e4a00 f86761cb Oct 13 20:57:07 bes kernel: <0> f72e4a00 f8683c97 c143ea14 ffffffea c12ba92d 00000286 f68f7d7c f6adfee4 Oct 13 20:57:07 bes kernel: <0> f68f7bfc 00000286 00000000 00000000 00000000 f68f7b9c f6adff68 f6adff64 Oct 13 20:57:07 bes kernel: Call Trace: Oct 13 20:57:07 bes kernel: [<c1243a94>] ? skb_queue_purge+0x14/0x30 Oct 13 20:57:07 bes kernel: [<f866825b>] ? ppp_destroy_channel+0x1b/0x50 [ppp_generic] Oct 13 20:57:07 bes kernel: [<f86761cb>] ? pppox_unbind_sock+0x1b/0x24 [pppox] Oct 13 20:57:07 bes kernel: [<f8683c97>] ? pppoe_connect+0x87/0x4b0 [pppoe] Oct 13 20:57:07 bes kernel: [<c12ba92d>] ? schedule_timeout+0xfd/0x150 Oct 13 20:57:07 bes kernel: [<c123d4d4>] ? sys_connect+0x84/0xd0 Oct 13 20:57:07 bes kernel: [<c10ba730>] ? do_lock_file_wait+0x30/0xf0 Oct 13 20:57:07 bes kernel: [<c10ba9f9>] ? fcntl_setlk+0x59/0x1b0 Oct 13 20:57:07 bes kernel: [<c123e5a4>] ? sys_socketcall+0x294/0x2c0 Oct 13 20:57:07 bes kernel: [<c1002a10>] ? sysenter_do_call+0x12/0x26 Oct 13 20:57:07 bes kernel: Code: 81 a8 00 00 00 5b c3 53 9c 5b fa 8b 08 39 c8 74 25 85 c9 74 1b 83 68 08 01 8b 11 8b 41 04 c7 01 00 00 00 00 c7 41 04 00 00 00 00 <89> 10 89 42 04 53 9d 89 c8 5b c3 31 c9 eb f6 8d b6 00 00 00 00 Oct 13 20:57:07 bes kernel: EIP: [<c1241674>] skb_dequeue+0x24/0x40 SS:ESP 0068:f6adfe68 Oct 13 20:57:07 bes kernel: CR2: 0000000000000000 Oct 13 20:57:07 bes kernel: ---[ end trace 4914adf67d1ace25 ]--- Oct 13 20:57:30 bes kernel: BUG: unable to handle kernel NULL pointer dereference at (null) Oct 13 20:57:30 bes kernel: IP: [<c1241674>] skb_dequeue+0x24/0x40 Oct 13 20:57:30 bes kernel: *pde = 00000000 Oct 13 20:57:30 bes kernel: Oops: 0002 [#2] Oct 13 20:57:30 bes kernel: last sysfs file: /sys/devices/virtual/net/ppp0/uevent Oct 13 20:57:30 bes kernel: Modules linked in: xt_TCPMSS xt_tcpmss xt_tcpudp iptable_mangle pppoe pppox ppp_generic slhc cpufreq_conservative cpufreq_userspace cpufreq_powersave fuse ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan ehci_hcd button i2c_core Oct 13 20:57:30 bes kernel: Oct 13 20:57:30 bes kernel: Pid: 5445, comm: pppd Tainted: G D 2.6.36-rc7 #12 VX800 /VX800 Oct 13 20:57:30 bes kernel: EIP: 0060:[<c1241674>] EFLAGS: 00010046 CPU: 0 Oct 13 20:57:30 bes kernel: EIP is at skb_dequeue+0x24/0x40 Oct 13 20:57:30 bes kernel: EAX: 00000000 EBX: 00000202 ECX: f6ae7200 EDX: 00000000 Oct 13 20:57:30 bes kernel: ESI: f6c99080 EDI: f7161ee4 EBP: f7160000 ESP: f7161e68 Oct 13 20:57:30 bes kernel: DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 Oct 13 20:57:30 bes kernel: Process pppd (pid: 5445, ti=f7160000 task=f7107280 task.ti=f7160000) Oct 13 20:57:30 bes kernel: Stack: Oct 13 20:57:30 bes kernel: f6883344 c1243a94 f6883340 f866825b 00000000 f72e4c00 f72e4c00 f86761cb Oct 13 20:57:30 bes kernel: <0> f72e4c00 f8683c97 c143ea14 ffffffea c12ba92d 00000286 f68f73bc f7161ee4 Oct 13 20:57:30 bes kernel: <0> f68f753c 00000286 00000000 00000000 00000000 f68f759c f7161f68 f7161f64 Oct 13 20:57:30 bes kernel: [<c1243a94>] ? skb_queue_purge+0x14/0x30 Oct 13 20:57:30 bes kernel: [<f866825b>] ? ppp_destroy_channel+0x1b/0x50 [ppp_generic] Oct 13 20:57:30 bes kernel: [<f86761cb>] ? pppox_unbind_sock+0x1b/0x24 [pppox] Oct 13 20:57:30 bes kernel: [<f8683c97>] ? pppoe_connect+0x87/0x4b0 [pppoe] Oct 13 20:57:30 bes kernel: [<c12ba92d>] ? schedule_timeout+0xfd/0x150 Oct 13 20:57:30 bes kernel: [<c123d4d4>] ? sys_connect+0x84/0xd0 Oct 13 20:57:30 bes kernel: [<c10ba730>] ? do_lock_file_wait+0x30/0xf0 Oct 13 20:57:30 bes kernel: [<c10ba9f9>] ? fcntl_setlk+0x59/0x1b0 Oct 13 20:57:30 bes kernel: [<c123e5a4>] ? sys_socketcall+0x294/0x2c0 Oct 13 20:57:30 bes kernel: [<c1002a10>] ? sysenter_do_call+0x12/0x26 Oct 13 20:57:30 bes kernel: Code: 81 a8 00 00 00 5b c3 53 9c 5b fa 8b 08 39 c8 74 25 85 c9 74 1b 83 68 08 01 8b 11 8b 41 04 c7 01 00 00 00 00 c7 41 04 00 00 00 00 <89> 10 89 42 04 53 9d 89 c8 5b c3 31 c9 eb f6 8d b6 00 00 00 00 Oct 13 20:57:30 bes kernel: EIP: [<c1241674>] skb_dequeue+0x24/0x40 SS:ESP 0068:f7161e68 Oct 13 20:57:30 bes kernel: CR2: 0000000000000000 Oct 13 20:57:30 bes kernel: ---[ end trace 4914adf67d1ace26 ]--- Oct 13 20:57:30 bes kernel: ------------[ cut here ]------------ Oct 13 20:57:30 bes kernel: WARNING: at kernel/softirq.c:143 local_bh_enable+0x60/0x90() Oct 13 20:57:30 bes kernel: Hardware name: VX800 Oct 13 20:57:30 bes kernel: Modules linked in: xt_TCPMSS xt_tcpmss xt_tcpudp iptable_mangle pppoe pppox ppp_generic slhc cpufreq_conservative cpufreq_userspace cpufreq_powersave fuse ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan ehci_hcd button i2c_core Oct 13 20:57:30 bes kernel: Pid: 5445, comm: pppd Tainted: G D 2.6.36-rc7 #12 Oct 13 20:57:30 bes kernel: Call Trace: Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 Oct 13 20:57:30 bes kernel: [<c1023a1e>] ? warn_slowpath_common+0x7e/0xc0 Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 Oct 13 20:57:30 bes kernel: [<c1023a7b>] ? warn_slowpath_null+0x1b/0x20 Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 Oct 13 20:57:30 bes kernel: [<c12a5bb5>] ? unix_release_sock+0x45/0x1f0 Oct 13 20:57:30 bes kernel: [<c123dc4a>] ? sock_release+0x1a/0x80 Oct 13 20:57:30 bes kernel: [<c123dcbf>] ? sock_close+0xf/0x30 Oct 13 20:57:30 bes kernel: [<c1089cd9>] ? fput+0xb9/0x200 Oct 13 20:57:30 bes kernel: [<c1086f7e>] ? filp_close+0x3e/0x70 Oct 13 20:57:30 bes kernel: [<c10254b2>] ? put_files_struct+0x62/0xb0 Oct 13 20:57:30 bes kernel: [<c1026c47>] ? do_exit+0x567/0x630 Oct 13 20:57:30 bes kernel: [<c12ba037>] ? printk+0x17/0x20 Oct 13 20:57:30 bes kernel: [<c1005477>] ? oops_end+0x87/0x90 Oct 13 20:57:30 bes kernel: [<c12ba037>] ? printk+0x17/0x20 Oct 13 20:57:30 bes kernel: [<c10194a2>] ? no_context+0xc2/0x160 Oct 13 20:57:30 bes kernel: [<c10195a5>] ? __bad_area_nosemaphore+0x65/0x180 Oct 13 20:57:30 bes kernel: [<c1249a3b>] ? dev_txq_stats_fold+0x8b/0xf0 Oct 13 20:57:30 bes kernel: [<c117dc80>] ? __nla_reserve+0x40/0x60 Oct 13 20:57:30 bes kernel: [<c1255c33>] ? rtnl_fill_ifinfo+0x413/0x8d0 Oct 13 20:57:30 bes kernel: [<c101971a>] ? bad_area+0x3a/0x50 Oct 13 20:57:30 bes kernel: [<c1019b8e>] ? do_page_fault+0x33e/0x390 Oct 13 20:57:30 bes kernel: [<c101e6ab>] ? wakeup_preempt_entity+0x3b/0xa0 Oct 13 20:57:30 bes kernel: [<c101e79a>] ? check_preempt_wakeup+0x8a/0xe0 Oct 13 20:57:30 bes kernel: [<c1097675>] ? pollwake+0x65/0x80 Oct 13 20:57:30 bes kernel: [<c1021170>] ? default_wake_function+0x0/0x10 Oct 13 20:57:30 bes kernel: [<c1019850>] ? do_page_fault+0x0/0x390 Oct 13 20:57:30 bes kernel: [<c12bbcf0>] ? error_code+0x58/0x60 Oct 13 20:57:30 bes kernel: [<c1019850>] ? do_page_fault+0x0/0x390 Oct 13 20:57:30 bes kernel: [<c1241674>] ? skb_dequeue+0x24/0x40 Oct 13 20:57:30 bes kernel: [<c1243a94>] ? skb_queue_purge+0x14/0x30 Oct 13 20:57:30 bes kernel: [<f866825b>] ? ppp_destroy_channel+0x1b/0x50 [ppp_generic] Oct 13 20:57:30 bes kernel: [<f86761cb>] ? pppox_unbind_sock+0x1b/0x24 [pppox] Oct 13 20:57:30 bes kernel: [<f8683c97>] ? pppoe_connect+0x87/0x4b0 [pppoe] Oct 13 20:57:30 bes kernel: [<c12ba92d>] ? schedule_timeout+0xfd/0x150 Oct 13 20:57:30 bes kernel: [<c123d4d4>] ? sys_connect+0x84/0xd0 Oct 13 20:57:30 bes kernel: [<c10ba730>] ? do_lock_file_wait+0x30/0xf0 Oct 13 20:57:30 bes kernel: [<c10ba9f9>] ? fcntl_setlk+0x59/0x1b0 Oct 13 20:57:30 bes kernel: [<c123e5a4>] ? sys_socketcall+0x294/0x2c0 Oct 13 20:57:30 bes kernel: [<c1002a10>] ? sysenter_do_call+0x12/0x26 Oct 13 20:57:30 bes kernel: ---[ end trace 4914adf67d1ace27 ]--- Some other information: /proc/version: Linux version 2.6.36-rc7 (root@bes) (gcc version 4.3.2 (Debian 4.3.2-1.1) ) #12 Sun Oct 10 21:12:58 CEST 2010 ver_linux: Linux bes 2.6.36-rc7 #12 Sun Oct 10 21:12:58 CEST 2010 i686 GNU/Linux Gnu C 4.4.5 Gnu make 3.81 binutils 2.20.1 util-linux 2.17.2 mount support module-init-tools 3.12 e2fsprogs 1.41.12 PPP 2.4.5 Linux C Library 2.11.2 Dynamic linker (ldd) 2.11.2 Procps 3.2.8 Net-tools 1.60 Console-tools 0.2.3 Sh-utils 8.5 Modules Loaded cpufreq_conservative cpufreq_userspace cpufreq_powersave fuse ppp_generic slhc ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan i2c_core ehci_hcd button cpuinfo: processor : 0 vendor_id : CentaurHauls cpu family : 6 model : 13 model name : VIA Eden Processor 1600MHz stepping : 0 cpu MHz : 800.000 cache size : 128 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge cmov pat clflush acpi mmx fxsr sse sse2 tm nx pni est tm2 xtpr rng rng_en ace ace_en ace2 ace2_en phe phe_en pmm pmm_en bogomips : 1599.76 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 32 bits virtual power management: If anything else is needed I'd be happy to assist. Thanks.
(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Wed, 13 Oct 2010 19:24:53 GMT bugzilla-daemon@bugzilla.kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=20292 > > Summary: unable to handle kernel NULL pointer dereference in > skb_dequeue > Product: Networking > Version: 2.5 > Kernel Version: 2.6.36-rc7 Thanks. Do you know if this is a regression? Did it work OK on 2.6.35? > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: blocking > Priority: P1 > Component: Other > AssignedTo: acme@ghostprotocols.net > ReportedBy: gvs@zemos.net > Regression: No > > > Created an attachment (id=33512) > --> (https://bugzilla.kernel.org/attachment.cgi?id=33512) > Kernel config (gzipped) > > I was trying to get pppoe working (the 'pon' command seemed to hang) and then > this happened: > > Oct 13 20:57:07 bes kernel: BUG: unable to handle kernel NULL pointer > dereference at (null) > Oct 13 20:57:07 bes kernel: IP: [<c1241674>] skb_dequeue+0x24/0x40 > Oct 13 20:57:07 bes kernel: *pde = 00000000 > Oct 13 20:57:07 bes kernel: Oops: 0002 [#1] > Oct 13 20:57:07 bes kernel: last sysfs file: > /sys/devices/virtual/net/ppp0/uevent > Oct 13 20:57:07 bes kernel: Modules linked in: xt_TCPMSS xt_tcpmss xt_tcpudp > iptable_mangle pppoe pppox ppp_generic slhc cpufreq_conservative > cpufreq_userspace cpufreq_powersave fuse ipt_MASQUERADE iptable_nat nf_nat > nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter > ip_tables > x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan ehci_hcd > button > i2c_core > Oct 13 20:57:07 bes kernel: > Oct 13 20:57:07 bes kernel: Pid: 5495, comm: pppd Not tainted 2.6.36-rc7 #12 > VX800 /VX800 > Oct 13 20:57:07 bes kernel: EIP: 0060:[<c1241674>] EFLAGS: 00010046 CPU: 0 > Oct 13 20:57:07 bes kernel: EIP is at skb_dequeue+0x24/0x40 > Oct 13 20:57:07 bes kernel: EAX: 00000000 EBX: 00000202 ECX: f6ba4cc0 EDX: > 00000000 > Oct 13 20:57:07 bes kernel: ESI: f6c93bc0 EDI: f6adfee4 EBP: f6ade000 ESP: > f6adfe68 > Oct 13 20:57:07 bes kernel: DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 > Oct 13 20:57:07 bes kernel: Process pppd (pid: 5495, ti=f6ade000 > task=f70f2200 > task.ti=f6ade000) > Oct 13 20:57:07 bes kernel: Stack: > Oct 13 20:57:07 bes kernel: f68836c4 c1243a94 f68836c0 f866825b 00000000 > f72e4a00 f72e4a00 f86761cb > Oct 13 20:57:07 bes kernel: <0> f72e4a00 f8683c97 c143ea14 ffffffea c12ba92d > 00000286 f68f7d7c f6adfee4 > Oct 13 20:57:07 bes kernel: <0> f68f7bfc 00000286 00000000 00000000 00000000 > f68f7b9c f6adff68 f6adff64 > Oct 13 20:57:07 bes kernel: Call Trace: > Oct 13 20:57:07 bes kernel: [<c1243a94>] ? skb_queue_purge+0x14/0x30 > Oct 13 20:57:07 bes kernel: [<f866825b>] ? ppp_destroy_channel+0x1b/0x50 > [ppp_generic] > Oct 13 20:57:07 bes kernel: [<f86761cb>] ? pppox_unbind_sock+0x1b/0x24 > [pppox] > Oct 13 20:57:07 bes kernel: [<f8683c97>] ? pppoe_connect+0x87/0x4b0 [pppoe] > Oct 13 20:57:07 bes kernel: [<c12ba92d>] ? schedule_timeout+0xfd/0x150 > Oct 13 20:57:07 bes kernel: [<c123d4d4>] ? sys_connect+0x84/0xd0 > Oct 13 20:57:07 bes kernel: [<c10ba730>] ? do_lock_file_wait+0x30/0xf0 > Oct 13 20:57:07 bes kernel: [<c10ba9f9>] ? fcntl_setlk+0x59/0x1b0 > Oct 13 20:57:07 bes kernel: [<c123e5a4>] ? sys_socketcall+0x294/0x2c0 > Oct 13 20:57:07 bes kernel: [<c1002a10>] ? sysenter_do_call+0x12/0x26 > Oct 13 20:57:07 bes kernel: Code: 81 a8 00 00 00 5b c3 53 9c 5b fa 8b 08 39 > c8 > 74 25 85 c9 74 1b 83 68 08 01 8b 11 8b 41 04 c7 01 00 00 00 00 c7 41 04 00 00 > 00 00 <89> 10 89 42 04 53 9d 89 c8 5b c3 31 c9 eb f6 8d b6 00 00 00 00 > Oct 13 20:57:07 bes kernel: EIP: [<c1241674>] skb_dequeue+0x24/0x40 SS:ESP > 0068:f6adfe68 > Oct 13 20:57:07 bes kernel: CR2: 0000000000000000 > Oct 13 20:57:07 bes kernel: ---[ end trace 4914adf67d1ace25 ]--- > > Oct 13 20:57:30 bes kernel: BUG: unable to handle kernel NULL pointer > dereference at (null) > Oct 13 20:57:30 bes kernel: IP: [<c1241674>] skb_dequeue+0x24/0x40 > Oct 13 20:57:30 bes kernel: *pde = 00000000 > Oct 13 20:57:30 bes kernel: Oops: 0002 [#2] > Oct 13 20:57:30 bes kernel: last sysfs file: > /sys/devices/virtual/net/ppp0/uevent > Oct 13 20:57:30 bes kernel: Modules linked in: xt_TCPMSS xt_tcpmss xt_tcpudp > iptable_mangle pppoe pppox ppp_generic slhc cpufreq_conservative > cpufreq_userspace cpufreq_powersave fuse ipt_MASQUERADE iptable_nat nf_nat > nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter > ip_tables > x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan ehci_hcd > button > i2c_core > Oct 13 20:57:30 bes kernel: > Oct 13 20:57:30 bes kernel: Pid: 5445, comm: pppd Tainted: G D > 2.6.36-rc7 #12 VX800 /VX800 > Oct 13 20:57:30 bes kernel: EIP: 0060:[<c1241674>] EFLAGS: 00010046 CPU: 0 > Oct 13 20:57:30 bes kernel: EIP is at skb_dequeue+0x24/0x40 > Oct 13 20:57:30 bes kernel: EAX: 00000000 EBX: 00000202 ECX: f6ae7200 EDX: > 00000000 > Oct 13 20:57:30 bes kernel: ESI: f6c99080 EDI: f7161ee4 EBP: f7160000 ESP: > f7161e68 > Oct 13 20:57:30 bes kernel: DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 > Oct 13 20:57:30 bes kernel: Process pppd (pid: 5445, ti=f7160000 > task=f7107280 > task.ti=f7160000) > Oct 13 20:57:30 bes kernel: Stack: > Oct 13 20:57:30 bes kernel: f6883344 c1243a94 f6883340 f866825b 00000000 > f72e4c00 f72e4c00 f86761cb > Oct 13 20:57:30 bes kernel: <0> f72e4c00 f8683c97 c143ea14 ffffffea c12ba92d > 00000286 f68f73bc f7161ee4 > Oct 13 20:57:30 bes kernel: <0> f68f753c 00000286 00000000 00000000 00000000 > f68f759c f7161f68 f7161f64 > Oct 13 20:57:30 bes kernel: [<c1243a94>] ? skb_queue_purge+0x14/0x30 > Oct 13 20:57:30 bes kernel: [<f866825b>] ? ppp_destroy_channel+0x1b/0x50 > [ppp_generic] > Oct 13 20:57:30 bes kernel: [<f86761cb>] ? pppox_unbind_sock+0x1b/0x24 > [pppox] > Oct 13 20:57:30 bes kernel: [<f8683c97>] ? pppoe_connect+0x87/0x4b0 [pppoe] > Oct 13 20:57:30 bes kernel: [<c12ba92d>] ? schedule_timeout+0xfd/0x150 > Oct 13 20:57:30 bes kernel: [<c123d4d4>] ? sys_connect+0x84/0xd0 > Oct 13 20:57:30 bes kernel: [<c10ba730>] ? do_lock_file_wait+0x30/0xf0 > Oct 13 20:57:30 bes kernel: [<c10ba9f9>] ? fcntl_setlk+0x59/0x1b0 > Oct 13 20:57:30 bes kernel: [<c123e5a4>] ? sys_socketcall+0x294/0x2c0 > Oct 13 20:57:30 bes kernel: [<c1002a10>] ? sysenter_do_call+0x12/0x26 > Oct 13 20:57:30 bes kernel: Code: 81 a8 00 00 00 5b c3 53 9c 5b fa 8b 08 39 > c8 > 74 25 85 c9 74 1b 83 68 08 01 8b 11 8b 41 04 c7 01 00 00 00 00 c7 41 04 00 00 > 00 00 <89> 10 89 42 04 53 9d 89 c8 5b c3 31 c9 eb f6 8d b6 00 00 00 00 > Oct 13 20:57:30 bes kernel: EIP: [<c1241674>] skb_dequeue+0x24/0x40 SS:ESP > 0068:f7161e68 > Oct 13 20:57:30 bes kernel: CR2: 0000000000000000 > Oct 13 20:57:30 bes kernel: ---[ end trace 4914adf67d1ace26 ]--- > Oct 13 20:57:30 bes kernel: ------------[ cut here ]------------ > Oct 13 20:57:30 bes kernel: WARNING: at kernel/softirq.c:143 > local_bh_enable+0x60/0x90() > Oct 13 20:57:30 bes kernel: Hardware name: VX800 > Oct 13 20:57:30 bes kernel: Modules linked in: xt_TCPMSS xt_tcpmss xt_tcpudp > iptable_mangle pppoe pppox ppp_generic slhc cpufreq_conservative > cpufreq_userspace cpufreq_powersave fuse ipt_MASQUERADE iptable_nat nf_nat > nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter > ip_tables > x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan ehci_hcd > button > i2c_core > Oct 13 20:57:30 bes kernel: Pid: 5445, comm: pppd Tainted: G D > 2.6.36-rc7 #12 > Oct 13 20:57:30 bes kernel: Call Trace: > Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 > Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 > Oct 13 20:57:30 bes kernel: [<c1023a1e>] ? warn_slowpath_common+0x7e/0xc0 > Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 > Oct 13 20:57:30 bes kernel: [<c1023a7b>] ? warn_slowpath_null+0x1b/0x20 > Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 > Oct 13 20:57:30 bes kernel: [<c12a5bb5>] ? unix_release_sock+0x45/0x1f0 > Oct 13 20:57:30 bes kernel: [<c123dc4a>] ? sock_release+0x1a/0x80 > Oct 13 20:57:30 bes kernel: [<c123dcbf>] ? sock_close+0xf/0x30 > Oct 13 20:57:30 bes kernel: [<c1089cd9>] ? fput+0xb9/0x200 > Oct 13 20:57:30 bes kernel: [<c1086f7e>] ? filp_close+0x3e/0x70 > Oct 13 20:57:30 bes kernel: [<c10254b2>] ? put_files_struct+0x62/0xb0 > Oct 13 20:57:30 bes kernel: [<c1026c47>] ? do_exit+0x567/0x630 > Oct 13 20:57:30 bes kernel: [<c12ba037>] ? printk+0x17/0x20 > Oct 13 20:57:30 bes kernel: [<c1005477>] ? oops_end+0x87/0x90 > Oct 13 20:57:30 bes kernel: [<c12ba037>] ? printk+0x17/0x20 > Oct 13 20:57:30 bes kernel: [<c10194a2>] ? no_context+0xc2/0x160 > Oct 13 20:57:30 bes kernel: [<c10195a5>] ? __bad_area_nosemaphore+0x65/0x180 > Oct 13 20:57:30 bes kernel: [<c1249a3b>] ? dev_txq_stats_fold+0x8b/0xf0 > Oct 13 20:57:30 bes kernel: [<c117dc80>] ? __nla_reserve+0x40/0x60 > Oct 13 20:57:30 bes kernel: [<c1255c33>] ? rtnl_fill_ifinfo+0x413/0x8d0 > Oct 13 20:57:30 bes kernel: [<c101971a>] ? bad_area+0x3a/0x50 > Oct 13 20:57:30 bes kernel: [<c1019b8e>] ? do_page_fault+0x33e/0x390 > Oct 13 20:57:30 bes kernel: [<c101e6ab>] ? wakeup_preempt_entity+0x3b/0xa0 > Oct 13 20:57:30 bes kernel: [<c101e79a>] ? check_preempt_wakeup+0x8a/0xe0 > Oct 13 20:57:30 bes kernel: [<c1097675>] ? pollwake+0x65/0x80 > Oct 13 20:57:30 bes kernel: [<c1021170>] ? default_wake_function+0x0/0x10 > Oct 13 20:57:30 bes kernel: [<c1019850>] ? do_page_fault+0x0/0x390 > Oct 13 20:57:30 bes kernel: [<c12bbcf0>] ? error_code+0x58/0x60 > Oct 13 20:57:30 bes kernel: [<c1019850>] ? do_page_fault+0x0/0x390 > Oct 13 20:57:30 bes kernel: [<c1241674>] ? skb_dequeue+0x24/0x40 > Oct 13 20:57:30 bes kernel: [<c1243a94>] ? skb_queue_purge+0x14/0x30 > Oct 13 20:57:30 bes kernel: [<f866825b>] ? ppp_destroy_channel+0x1b/0x50 > [ppp_generic] > Oct 13 20:57:30 bes kernel: [<f86761cb>] ? pppox_unbind_sock+0x1b/0x24 > [pppox] > Oct 13 20:57:30 bes kernel: [<f8683c97>] ? pppoe_connect+0x87/0x4b0 [pppoe] > Oct 13 20:57:30 bes kernel: [<c12ba92d>] ? schedule_timeout+0xfd/0x150 > Oct 13 20:57:30 bes kernel: [<c123d4d4>] ? sys_connect+0x84/0xd0 > Oct 13 20:57:30 bes kernel: [<c10ba730>] ? do_lock_file_wait+0x30/0xf0 > Oct 13 20:57:30 bes kernel: [<c10ba9f9>] ? fcntl_setlk+0x59/0x1b0 > Oct 13 20:57:30 bes kernel: [<c123e5a4>] ? sys_socketcall+0x294/0x2c0 > Oct 13 20:57:30 bes kernel: [<c1002a10>] ? sysenter_do_call+0x12/0x26 > Oct 13 20:57:30 bes kernel: ---[ end trace 4914adf67d1ace27 ]--- > > Some other information: > /proc/version: > Linux version 2.6.36-rc7 (root@bes) (gcc version 4.3.2 (Debian 4.3.2-1.1) ) > #12 > Sun Oct 10 21:12:58 CEST 2010 > > ver_linux: > Linux bes 2.6.36-rc7 #12 Sun Oct 10 21:12:58 CEST 2010 i686 GNU/Linux > > Gnu C 4.4.5 > Gnu make 3.81 > binutils 2.20.1 > util-linux 2.17.2 > mount support > module-init-tools 3.12 > e2fsprogs 1.41.12 > PPP 2.4.5 > Linux C Library 2.11.2 > Dynamic linker (ldd) 2.11.2 > Procps 3.2.8 > Net-tools 1.60 > Console-tools 0.2.3 > Sh-utils 8.5 > Modules Loaded cpufreq_conservative cpufreq_userspace > cpufreq_powersave > fuse ppp_generic slhc ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 > nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables loop > sd_mod usb_storage usblp i2c_viapro uhci_hcd fan i2c_core ehci_hcd button > > cpuinfo: > processor : 0 > vendor_id : CentaurHauls > cpu family : 6 > model : 13 > model name : VIA Eden Processor 1600MHz > stepping : 0 > cpu MHz : 800.000 > cache size : 128 KB > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 1 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge cmov > pat > clflush acpi mmx fxsr sse sse2 tm nx pni est tm2 xtpr rng rng_en ace ace_en > ace2 ace2_en phe phe_en pmm pmm_en > bogomips : 1599.76 > clflush size : 64 > cache_alignment : 64 > address sizes : 36 bits physical, 32 bits virtual > power management: > > If anything else is needed I'd be happy to assist. >
I had no problems getting it to work properly in 2.6.35.7. However, when I booted back into rc7 I was unable to reproduce the problem. I believe I was running multiple pppd's that failed to authenticate at the time the bug occured. I'll leave it running rc7 and see if everything stays stable. gvs On Wed, Oct 13, 2010 at 12:33:32PM -0700, Andrew Morton wrote: > > (switched to email. Please respond via emailed reply-to-all, not via the > bugzilla web interface). > > On Wed, 13 Oct 2010 19:24:53 GMT > bugzilla-daemon@bugzilla.kernel.org wrote: > > > https://bugzilla.kernel.org/show_bug.cgi?id=20292 > > > > Summary: unable to handle kernel NULL pointer dereference in > > skb_dequeue > > Product: Networking > > Version: 2.5 > > Kernel Version: 2.6.36-rc7 > > Thanks. Do you know if this is a regression? Did it work OK on 2.6.35? > > > Platform: All > > OS/Version: Linux > > Tree: Mainline > > Status: NEW > > Severity: blocking > > Priority: P1 > > Component: Other > > AssignedTo: acme@ghostprotocols.net > > ReportedBy: gvs@zemos.net > > Regression: No > > > > > > Created an attachment (id=33512) > > --> (https://bugzilla.kernel.org/attachment.cgi?id=33512) > > Kernel config (gzipped) > > > > I was trying to get pppoe working (the 'pon' command seemed to hang) and > then > > this happened: > > > > Oct 13 20:57:07 bes kernel: BUG: unable to handle kernel NULL pointer > > dereference at (null) > > Oct 13 20:57:07 bes kernel: IP: [<c1241674>] skb_dequeue+0x24/0x40 > > Oct 13 20:57:07 bes kernel: *pde = 00000000 > > Oct 13 20:57:07 bes kernel: Oops: 0002 [#1] > > Oct 13 20:57:07 bes kernel: last sysfs file: > > /sys/devices/virtual/net/ppp0/uevent > > Oct 13 20:57:07 bes kernel: Modules linked in: xt_TCPMSS xt_tcpmss > xt_tcpudp > > iptable_mangle pppoe pppox ppp_generic slhc cpufreq_conservative > > cpufreq_userspace cpufreq_powersave fuse ipt_MASQUERADE iptable_nat nf_nat > > nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter > ip_tables > > x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan ehci_hcd > button > > i2c_core > > Oct 13 20:57:07 bes kernel: > > Oct 13 20:57:07 bes kernel: Pid: 5495, comm: pppd Not tainted 2.6.36-rc7 > #12 > > VX800 /VX800 > > Oct 13 20:57:07 bes kernel: EIP: 0060:[<c1241674>] EFLAGS: 00010046 CPU: 0 > > Oct 13 20:57:07 bes kernel: EIP is at skb_dequeue+0x24/0x40 > > Oct 13 20:57:07 bes kernel: EAX: 00000000 EBX: 00000202 ECX: f6ba4cc0 EDX: > > 00000000 > > Oct 13 20:57:07 bes kernel: ESI: f6c93bc0 EDI: f6adfee4 EBP: f6ade000 ESP: > > f6adfe68 > > Oct 13 20:57:07 bes kernel: DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 > > Oct 13 20:57:07 bes kernel: Process pppd (pid: 5495, ti=f6ade000 > task=f70f2200 > > task.ti=f6ade000) > > Oct 13 20:57:07 bes kernel: Stack: > > Oct 13 20:57:07 bes kernel: f68836c4 c1243a94 f68836c0 f866825b 00000000 > > f72e4a00 f72e4a00 f86761cb > > Oct 13 20:57:07 bes kernel: <0> f72e4a00 f8683c97 c143ea14 ffffffea > c12ba92d > > 00000286 f68f7d7c f6adfee4 > > Oct 13 20:57:07 bes kernel: <0> f68f7bfc 00000286 00000000 00000000 > 00000000 > > f68f7b9c f6adff68 f6adff64 > > Oct 13 20:57:07 bes kernel: Call Trace: > > Oct 13 20:57:07 bes kernel: [<c1243a94>] ? skb_queue_purge+0x14/0x30 > > Oct 13 20:57:07 bes kernel: [<f866825b>] ? ppp_destroy_channel+0x1b/0x50 > > [ppp_generic] > > Oct 13 20:57:07 bes kernel: [<f86761cb>] ? pppox_unbind_sock+0x1b/0x24 > [pppox] > > Oct 13 20:57:07 bes kernel: [<f8683c97>] ? pppoe_connect+0x87/0x4b0 [pppoe] > > Oct 13 20:57:07 bes kernel: [<c12ba92d>] ? schedule_timeout+0xfd/0x150 > > Oct 13 20:57:07 bes kernel: [<c123d4d4>] ? sys_connect+0x84/0xd0 > > Oct 13 20:57:07 bes kernel: [<c10ba730>] ? do_lock_file_wait+0x30/0xf0 > > Oct 13 20:57:07 bes kernel: [<c10ba9f9>] ? fcntl_setlk+0x59/0x1b0 > > Oct 13 20:57:07 bes kernel: [<c123e5a4>] ? sys_socketcall+0x294/0x2c0 > > Oct 13 20:57:07 bes kernel: [<c1002a10>] ? sysenter_do_call+0x12/0x26 > > Oct 13 20:57:07 bes kernel: Code: 81 a8 00 00 00 5b c3 53 9c 5b fa 8b 08 39 > c8 > > 74 25 85 c9 74 1b 83 68 08 01 8b 11 8b 41 04 c7 01 00 00 00 00 c7 41 04 00 > 00 > > 00 00 <89> 10 89 42 04 53 9d 89 c8 5b c3 31 c9 eb f6 8d b6 00 00 00 00 > > Oct 13 20:57:07 bes kernel: EIP: [<c1241674>] skb_dequeue+0x24/0x40 SS:ESP > > 0068:f6adfe68 > > Oct 13 20:57:07 bes kernel: CR2: 0000000000000000 > > Oct 13 20:57:07 bes kernel: ---[ end trace 4914adf67d1ace25 ]--- > > > > Oct 13 20:57:30 bes kernel: BUG: unable to handle kernel NULL pointer > > dereference at (null) > > Oct 13 20:57:30 bes kernel: IP: [<c1241674>] skb_dequeue+0x24/0x40 > > Oct 13 20:57:30 bes kernel: *pde = 00000000 > > Oct 13 20:57:30 bes kernel: Oops: 0002 [#2] > > Oct 13 20:57:30 bes kernel: last sysfs file: > > /sys/devices/virtual/net/ppp0/uevent > > Oct 13 20:57:30 bes kernel: Modules linked in: xt_TCPMSS xt_tcpmss > xt_tcpudp > > iptable_mangle pppoe pppox ppp_generic slhc cpufreq_conservative > > cpufreq_userspace cpufreq_powersave fuse ipt_MASQUERADE iptable_nat nf_nat > > nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter > ip_tables > > x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan ehci_hcd > button > > i2c_core > > Oct 13 20:57:30 bes kernel: > > Oct 13 20:57:30 bes kernel: Pid: 5445, comm: pppd Tainted: G D > > 2.6.36-rc7 #12 VX800 /VX800 > > Oct 13 20:57:30 bes kernel: EIP: 0060:[<c1241674>] EFLAGS: 00010046 CPU: 0 > > Oct 13 20:57:30 bes kernel: EIP is at skb_dequeue+0x24/0x40 > > Oct 13 20:57:30 bes kernel: EAX: 00000000 EBX: 00000202 ECX: f6ae7200 EDX: > > 00000000 > > Oct 13 20:57:30 bes kernel: ESI: f6c99080 EDI: f7161ee4 EBP: f7160000 ESP: > > f7161e68 > > Oct 13 20:57:30 bes kernel: DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 > > Oct 13 20:57:30 bes kernel: Process pppd (pid: 5445, ti=f7160000 > task=f7107280 > > task.ti=f7160000) > > Oct 13 20:57:30 bes kernel: Stack: > > Oct 13 20:57:30 bes kernel: f6883344 c1243a94 f6883340 f866825b 00000000 > > f72e4c00 f72e4c00 f86761cb > > Oct 13 20:57:30 bes kernel: <0> f72e4c00 f8683c97 c143ea14 ffffffea > c12ba92d > > 00000286 f68f73bc f7161ee4 > > Oct 13 20:57:30 bes kernel: <0> f68f753c 00000286 00000000 00000000 > 00000000 > > f68f759c f7161f68 f7161f64 > > Oct 13 20:57:30 bes kernel: [<c1243a94>] ? skb_queue_purge+0x14/0x30 > > Oct 13 20:57:30 bes kernel: [<f866825b>] ? ppp_destroy_channel+0x1b/0x50 > > [ppp_generic] > > Oct 13 20:57:30 bes kernel: [<f86761cb>] ? pppox_unbind_sock+0x1b/0x24 > [pppox] > > Oct 13 20:57:30 bes kernel: [<f8683c97>] ? pppoe_connect+0x87/0x4b0 [pppoe] > > Oct 13 20:57:30 bes kernel: [<c12ba92d>] ? schedule_timeout+0xfd/0x150 > > Oct 13 20:57:30 bes kernel: [<c123d4d4>] ? sys_connect+0x84/0xd0 > > Oct 13 20:57:30 bes kernel: [<c10ba730>] ? do_lock_file_wait+0x30/0xf0 > > Oct 13 20:57:30 bes kernel: [<c10ba9f9>] ? fcntl_setlk+0x59/0x1b0 > > Oct 13 20:57:30 bes kernel: [<c123e5a4>] ? sys_socketcall+0x294/0x2c0 > > Oct 13 20:57:30 bes kernel: [<c1002a10>] ? sysenter_do_call+0x12/0x26 > > Oct 13 20:57:30 bes kernel: Code: 81 a8 00 00 00 5b c3 53 9c 5b fa 8b 08 39 > c8 > > 74 25 85 c9 74 1b 83 68 08 01 8b 11 8b 41 04 c7 01 00 00 00 00 c7 41 04 00 > 00 > > 00 00 <89> 10 89 42 04 53 9d 89 c8 5b c3 31 c9 eb f6 8d b6 00 00 00 00 > > Oct 13 20:57:30 bes kernel: EIP: [<c1241674>] skb_dequeue+0x24/0x40 SS:ESP > > 0068:f7161e68 > > Oct 13 20:57:30 bes kernel: CR2: 0000000000000000 > > Oct 13 20:57:30 bes kernel: ---[ end trace 4914adf67d1ace26 ]--- > > Oct 13 20:57:30 bes kernel: ------------[ cut here ]------------ > > Oct 13 20:57:30 bes kernel: WARNING: at kernel/softirq.c:143 > > local_bh_enable+0x60/0x90() > > Oct 13 20:57:30 bes kernel: Hardware name: VX800 > > Oct 13 20:57:30 bes kernel: Modules linked in: xt_TCPMSS xt_tcpmss > xt_tcpudp > > iptable_mangle pppoe pppox ppp_generic slhc cpufreq_conservative > > cpufreq_userspace cpufreq_powersave fuse ipt_MASQUERADE iptable_nat nf_nat > > nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter > ip_tables > > x_tables loop sd_mod usb_storage usblp i2c_viapro uhci_hcd fan ehci_hcd > button > > i2c_core > > Oct 13 20:57:30 bes kernel: Pid: 5445, comm: pppd Tainted: G D > > 2.6.36-rc7 #12 > > Oct 13 20:57:30 bes kernel: Call Trace: > > Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 > > Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 > > Oct 13 20:57:30 bes kernel: [<c1023a1e>] ? warn_slowpath_common+0x7e/0xc0 > > Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 > > Oct 13 20:57:30 bes kernel: [<c1023a7b>] ? warn_slowpath_null+0x1b/0x20 > > Oct 13 20:57:30 bes kernel: [<c1028640>] ? local_bh_enable+0x60/0x90 > > Oct 13 20:57:30 bes kernel: [<c12a5bb5>] ? unix_release_sock+0x45/0x1f0 > > Oct 13 20:57:30 bes kernel: [<c123dc4a>] ? sock_release+0x1a/0x80 > > Oct 13 20:57:30 bes kernel: [<c123dcbf>] ? sock_close+0xf/0x30 > > Oct 13 20:57:30 bes kernel: [<c1089cd9>] ? fput+0xb9/0x200 > > Oct 13 20:57:30 bes kernel: [<c1086f7e>] ? filp_close+0x3e/0x70 > > Oct 13 20:57:30 bes kernel: [<c10254b2>] ? put_files_struct+0x62/0xb0 > > Oct 13 20:57:30 bes kernel: [<c1026c47>] ? do_exit+0x567/0x630 > > Oct 13 20:57:30 bes kernel: [<c12ba037>] ? printk+0x17/0x20 > > Oct 13 20:57:30 bes kernel: [<c1005477>] ? oops_end+0x87/0x90 > > Oct 13 20:57:30 bes kernel: [<c12ba037>] ? printk+0x17/0x20 > > Oct 13 20:57:30 bes kernel: [<c10194a2>] ? no_context+0xc2/0x160 > > Oct 13 20:57:30 bes kernel: [<c10195a5>] ? > __bad_area_nosemaphore+0x65/0x180 > > Oct 13 20:57:30 bes kernel: [<c1249a3b>] ? dev_txq_stats_fold+0x8b/0xf0 > > Oct 13 20:57:30 bes kernel: [<c117dc80>] ? __nla_reserve+0x40/0x60 > > Oct 13 20:57:30 bes kernel: [<c1255c33>] ? rtnl_fill_ifinfo+0x413/0x8d0 > > Oct 13 20:57:30 bes kernel: [<c101971a>] ? bad_area+0x3a/0x50 > > Oct 13 20:57:30 bes kernel: [<c1019b8e>] ? do_page_fault+0x33e/0x390 > > Oct 13 20:57:30 bes kernel: [<c101e6ab>] ? wakeup_preempt_entity+0x3b/0xa0 > > Oct 13 20:57:30 bes kernel: [<c101e79a>] ? check_preempt_wakeup+0x8a/0xe0 > > Oct 13 20:57:30 bes kernel: [<c1097675>] ? pollwake+0x65/0x80 > > Oct 13 20:57:30 bes kernel: [<c1021170>] ? default_wake_function+0x0/0x10 > > Oct 13 20:57:30 bes kernel: [<c1019850>] ? do_page_fault+0x0/0x390 > > Oct 13 20:57:30 bes kernel: [<c12bbcf0>] ? error_code+0x58/0x60 > > Oct 13 20:57:30 bes kernel: [<c1019850>] ? do_page_fault+0x0/0x390 > > Oct 13 20:57:30 bes kernel: [<c1241674>] ? skb_dequeue+0x24/0x40 > > Oct 13 20:57:30 bes kernel: [<c1243a94>] ? skb_queue_purge+0x14/0x30 > > Oct 13 20:57:30 bes kernel: [<f866825b>] ? ppp_destroy_channel+0x1b/0x50 > > [ppp_generic] > > Oct 13 20:57:30 bes kernel: [<f86761cb>] ? pppox_unbind_sock+0x1b/0x24 > [pppox] > > Oct 13 20:57:30 bes kernel: [<f8683c97>] ? pppoe_connect+0x87/0x4b0 [pppoe] > > Oct 13 20:57:30 bes kernel: [<c12ba92d>] ? schedule_timeout+0xfd/0x150 > > Oct 13 20:57:30 bes kernel: [<c123d4d4>] ? sys_connect+0x84/0xd0 > > Oct 13 20:57:30 bes kernel: [<c10ba730>] ? do_lock_file_wait+0x30/0xf0 > > Oct 13 20:57:30 bes kernel: [<c10ba9f9>] ? fcntl_setlk+0x59/0x1b0 > > Oct 13 20:57:30 bes kernel: [<c123e5a4>] ? sys_socketcall+0x294/0x2c0 > > Oct 13 20:57:30 bes kernel: [<c1002a10>] ? sysenter_do_call+0x12/0x26 > > Oct 13 20:57:30 bes kernel: ---[ end trace 4914adf67d1ace27 ]--- > > > > Some other information: > > /proc/version: > > Linux version 2.6.36-rc7 (root@bes) (gcc version 4.3.2 (Debian 4.3.2-1.1) ) > #12 > > Sun Oct 10 21:12:58 CEST 2010 > > > > ver_linux: > > Linux bes 2.6.36-rc7 #12 Sun Oct 10 21:12:58 CEST 2010 i686 GNU/Linux > > > > Gnu C 4.4.5 > > Gnu make 3.81 > > binutils 2.20.1 > > util-linux 2.17.2 > > mount support > > module-init-tools 3.12 > > e2fsprogs 1.41.12 > > PPP 2.4.5 > > Linux C Library 2.11.2 > > Dynamic linker (ldd) 2.11.2 > > Procps 3.2.8 > > Net-tools 1.60 > > Console-tools 0.2.3 > > Sh-utils 8.5 > > Modules Loaded cpufreq_conservative cpufreq_userspace > cpufreq_powersave > > fuse ppp_generic slhc ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 > > nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables loop > > sd_mod usb_storage usblp i2c_viapro uhci_hcd fan i2c_core ehci_hcd button > > > > cpuinfo: > > processor : 0 > > vendor_id : CentaurHauls > > cpu family : 6 > > model : 13 > > model name : VIA Eden Processor 1600MHz > > stepping : 0 > > cpu MHz : 800.000 > > cache size : 128 KB > > fdiv_bug : no > > hlt_bug : no > > f00f_bug : no > > coma_bug : no > > fpu : yes > > fpu_exception : yes > > cpuid level : 1 > > wp : yes > > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge cmov > pat > > clflush acpi mmx fxsr sse sse2 tm nx pni est tm2 xtpr rng rng_en ace ace_en > > ace2 ace2_en phe phe_en pmm pmm_en > > bogomips : 1599.76 > > clflush size : 64 > > cache_alignment : 64 > > address sizes : 36 bits physical, 32 bits virtual > > power management: > > > > If anything else is needed I'd be happy to assist. > > >
Created attachment 37362 [details] kernel config Same/similar issue here: 2.6.36 (with gentoo patchset http://gentoo-portage.com/sys-kernel/gentoo-sources ) The issue seem to only appear if the connection is terminated by the other side (24h forced disconnect) Nov 15 23:09:04 [pppd] LCP terminated by peer Nov 15 23:09:04 [pppd] Connect time 1440.0 minutes. Nov 15 23:09:04 [pppd] Sent 49976877 bytes, received 465887239 bytes. Nov 15 23:09:07 [pppd] Connection terminated. Nov 15 23:09:07 [kernel] BUG: unable to handle kernel NULL pointer dereference at 00000004 Nov 15 23:09:07 [kernel] IP: [<c12b7418>] skb_dequeue+0x28/0x40 Nov 15 23:09:07 [kernel] *pde = 00000000 Nov 15 23:09:07 [kernel] Modules linked in: ipv6 xt_TCPMSS btrfs crc32c libcrc32c Nov 15 23:09:07 [kernel] Pid: 7927, comm: pppd Not tainted 2.6.36-gentoo #1 DR742/Equium 3100M Nov 15 23:09:07 [kernel] EIP: 0060:[<c12b7418>] EFLAGS: 00010046 CPU: 0 Nov 15 23:09:07 [kernel] EIP is at skb_dequeue+0x28/0x40 Nov 15 23:09:07 [kernel] EAX: cf1e9bc0 EBX: 00000000 ECX: 00000202 EDX: 00000000 Nov 15 23:09:07 [kernel] ESI: ce1ac9a0 EDI: c136d9e0 EBP: c64a3e58 ESP: c64a3e54 Nov 15 23:09:07 [kernel] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 Nov 15 23:09:07 [kernel] ce1ac964 c64a3e64 c12b9d8c ce1ac960 c64a3e78 c124740e 00000000 ce1ac960 Nov 15 23:09:07 [kernel] <0> ce1ac960 c64a3e8c c1249437 00000000 cf3d3000 ffffffea c64a3e98 c124d4ac Nov 15 23:09:07 [kernel] <0> cf3d3000 c64a3ed0 c124e1f7 c10b9034 00000000 00000000 00000000 cf282adc Nov 15 23:09:07 [kernel] [<c12b9d8c>] ? skb_queue_purge+0x1c/0x30 Nov 15 23:09:07 [kernel] [<c124740e>] ? ppp_destroy_channel+0x1e/0x50 Nov 15 23:09:07 [kernel] [<c1249437>] ? ppp_unregister_channel+0xb7/0xd0 Nov 15 23:09:07 [kernel] [<c124d4ac>] ? pppox_unbind_sock+0x1c/0x30 Nov 15 23:09:07 [kernel] [<c124e1f7>] ? pppoe_connect+0x87/0x430 Nov 15 23:09:07 [kernel] [<c10b9034>] ? __posix_lock_file+0x114/0x5f0 Nov 15 23:09:07 [kernel] [<c12b34bd>] ? sys_connect+0x5d/0x90 Nov 15 23:09:07 [kernel] [<c10b9638>] ? do_lock_file_wait+0x38/0xf0 Nov 15 23:09:07 [kernel] [<c101e7b3>] ? do_page_fault+0x193/0x3c0 Nov 15 23:09:07 [kernel] [<c12b43f0>] ? sys_socketcall+0x250/0x270 Nov 15 23:09:07 [kernel] [<c10029d0>] ? sysenter_do_call+0x12/0x26 Nov 15 23:09:07 [kernel] ---[ end trace 5b353b73335be30f ]---
Similar problem here, vanilla 2.6.36. Happened twice on a ppp disconnect by the other side now, however it started to appear since i've been using JDownloader to download some stuff, so the problem might be caused when the disconnect happens when there's traffic on the line. Worked without problems for a month, and i get a disconnect every 24h. Nov 20 09:06:03 wz1 pppd[2417]: LCP terminated by peer Nov 20 09:06:03 wz1 pppd[2417]: Connect time 1440.0 minutes. Nov 20 09:06:03 wz1 pppd[2417]: Sent 431867576 bytes, received 134588524 bytes. Nov 20 09:06:07 wz1 pppd[2417]: Connection terminated. Nov 20 09:06:07 wz1 kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 Nov 20 09:06:07 wz1 kernel: IP: [<ffffffff8135d09f>] skb_dequeue+0x4f/0x80 Nov 20 09:06:07 wz1 kernel: PGD 11e60d067 PUD 11e60e067 PMD 0 Nov 20 09:06:07 wz1 kernel: Oops: 0002 [#1] SMP Nov 20 09:06:07 wz1 kernel: last sysfs file: /sys/devices/platform/it87.656/temp2_input Nov 20 09:06:07 wz1 kernel: CPU 1 Nov 20 09:06:07 wz1 kernel: Modules linked in: vfat fat xt_mac xt_ipp2p ipt_set ipt_SET compat_xtables ip_set snd_seq_midi snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_midi_event snd_seq_midi_emul nvidia(P) b2c2_flexcop_pci b2c2_flexcop s5h1420 mt352 itd1000 bcm3510 dvb_pll stv0297 nxt200x isl6421 tuner_simple tuner_types cx24113 mt312 cx24123 snd_emu10k1 snd_rawmidi snd_ac97_codec lgdt330x ac97_bus snd_pcm stv0299 snd_page_alloc dvb_core snd_util_mem snd_hwdep floppy i2c_i801 pcspkr Nov 20 09:06:07 wz1 kernel: Nov 20 09:06:07 wz1 kernel: Pid: 2417, comm: pppd Tainted: P W 2.6.36 #2 P35-DS3/P35-DS3 Nov 20 09:06:07 wz1 kernel: RIP: 0010:[<ffffffff8135d09f>] [<ffffffff8135d09f>] skb_dequeue+0x4f/0x80 Nov 20 09:06:07 wz1 kernel: RSP: 0018:ffff88011e565db8 EFLAGS: 00010046 Nov 20 09:06:07 wz1 kernel: RAX: 0000000000000286 RBX: ffff8801108c889c RCX: 0000000000000000 Nov 20 09:06:07 wz1 kernel: RDX: 0000000000000000 RSI: 0000000000000286 RDI: ffff8801108c889c Nov 20 09:06:07 wz1 kernel: RBP: ffff88011e565dd8 R08: 0000000000000000 R09: dead000000200200 Nov 20 09:06:07 wz1 kernel: R10: dead000000100100 R11: 0000000000000246 R12: ffff88011c4fe880 Nov 20 09:06:07 wz1 kernel: R13: ffff8801108c8888 R14: 00007fff4c92de20 R15: 0000000000000000 Nov 20 09:06:07 wz1 kernel: FS: 00007fd391a0b700(0000) GS:ffff880001900000(0000) knlGS:0000000000000000 Nov 20 09:06:07 wz1 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Nov 20 09:06:07 wz1 kernel: CR2: 0000000000000008 CR3: 000000011ced6000 CR4: 00000000000006e0 Nov 20 09:06:07 wz1 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Nov 20 09:06:07 wz1 kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Nov 20 09:06:07 wz1 kernel: Process pppd (pid: 2417, threadinfo ffff88011e564000, task ffff88011fec52d0) Nov 20 09:06:07 wz1 kernel: Stack: Nov 20 09:06:07 wz1 kernel: 0000000000000286 ffff8801108c8888 ffff88011ed03e24 ffff8801108c8918 Nov 20 09:06:07 wz1 kernel: <0> ffff88011e565df8 ffffffff8135de10 ffff88011e565e18 ffff8801108c8880 Nov 20 09:06:07 wz1 kernel: <0> ffff88011e565e18 ffffffff812b47e3 00007fff4c92de20 ffff8801108c8880 Nov 20 09:06:07 wz1 kernel: Call Trace: Nov 20 09:06:07 wz1 kernel: [<ffffffff8135de10>] skb_queue_purge+0x20/0x30 Nov 20 09:06:07 wz1 kernel: [<ffffffff812b47e3>] ppp_destroy_channel+0x23/0x50 Nov 20 09:06:07 wz1 kernel: [<ffffffff812b6b50>] ppp_unregister_channel+0x110/0x130 Nov 20 09:06:07 wz1 kernel: [<ffffffff812b9490>] pppox_unbind_sock+0x20/0x30 Nov 20 09:06:07 wz1 kernel: [<ffffffff812ba308>] pppoe_connect+0xa8/0x4c0 Nov 20 09:06:07 wz1 kernel: [<ffffffff813557f0>] sys_connect+0x70/0xa0 Nov 20 09:06:07 wz1 kernel: [<ffffffff810c2420>] ? sys_fcntl+0x1a0/0x5b0 Nov 20 09:06:07 wz1 kernel: [<ffffffff8100232b>] system_call_fastpath+0x16/0x1b Nov 20 09:06:07 wz1 kernel: Code: 8b 65 00 4d 39 e5 74 4c 4d 85 e4 74 25 41 ff 4d 10 49 8b 0c 24 49 8b 54 24 08 49 c7 04 24 00 00 00 00 49 c7 44 24 08 00 00 00 00 <48> 89 51 08 48 89 0a 48 89 c6 48 89 df e8 1f df 0f 00 4c 89 e0 Nov 20 09:06:07 wz1 kernel: RIP [<ffffffff8135d09f>] skb_dequeue+0x4f/0x80 Nov 20 09:06:07 wz1 kernel: RSP <ffff88011e565db8> Nov 20 09:06:07 wz1 kernel: CR2: 0000000000000008 Nov 20 09:06:07 wz1 kernel: ---[ end trace 77b6047e11514c90 ]---
Please check this http://marc.info/?l=linux-kernel&m=129138181231513&w=2