Subject: Re: 2.6.35-rc2 : OOPS with LTP memcg regression test run.

From: Maciej Rutecki <[email-masked]>
Date: Thu, 10 Jun 2010 22:00:57 +0200

I created a Bugzilla entry at 
https://bugzilla.kernel.org/show_bug.cgi?id=16178
for your bug report, please add your address to the CC list in there, thanks!

On niedziela, 6 czerwca 2010 o 17:06:54 Sachin Sant wrote:
> While executing LTP Controller tests(memcg regression) on
> a POWER6 box came across this following OOPS.
> 
> Memory cgroup out of memory: kill process 9139 (memcg_test_1) score 3 or a
>  child Killed process 9139 (memcg_test_1) vsz:3456kB, anon-rss:448kB,
>  file-rss:1088kB Memory cgroup out of memory: kill process 9140
>  (memcg_test_1) score 3 or a child Killed process 9140 (memcg_test_1)
>  vsz:3456kB, anon-rss:448kB, file-rss:1088kB Unable to handle kernel paging
>  request for data at address 0x720072007200720 Faulting instruction
>  address: 0xc00000000015b778
> Oops: Kernel access of bad area, sig: 11 [#2]
> SMP NR_CPUS=1024 NUMA pSeries
> last sysfs file: /sys/devices/system/cpu/cpu1/cache/index1/shared_cpu_map
> Modules linked in: quota_v2 quota_tree ipv6 fuse loop dm_mod sr_mod cdrom
>  sg sd_mod crc_t10dif ibmvscsic scsi_transport_srp scsi_tgt scsi_mod NIP:
>  c00000000015b778 LR: c00000000015b740 CTR: 0000000000000000
> REGS: c000000009812ff0 TRAP: 0300   Tainted: G      D     
>  (2.6.35-rc2-autotest) MSR: 8000000000009032 <EE,ME,IR,DR>  CR: 44004424 
>  XER: 00000001
> DAR: 0720072007200720, DSISR: 0000000040000000
> TASK = c000000005fb1100[9155] 'umount' THREAD: c000000009810000 CPU: 0
> GPR00: 0000000000000000 c000000009813270 c000000000d3d7a0 0000000000000000
> GPR04: 0000000000008050 0000000000160000 0000000000000027 c00000000f2c6870
> GPR08: 00000000000006a5 c000000000b16870 c000000000cf0140 000000000e7b0000
> GPR12: 0000000024004428 c000000007440000 0000000000008000 fffffffffffff000
> GPR16: 0000000000000000 c0000000098138f0 000000000000002d 0000000000000027
> GPR20: 0000000000000000 0000000000000027 0000000000000000 c000000007063138
> GPR24: ffffffffffffffff 0000000000000000 c00000000019bafc c00000000e02e000
> GPR28: 0000000000000001 0000000000008050 c000000000ca6b00 0720072007200720
> NIP [c00000000015b778] .kmem_cache_alloc+0xb0/0x13c
> LR [c00000000015b740] .kmem_cache_alloc+0x78/0x13c
> Call Trace:
> [c000000009813270] [c00000000015b740] .kmem_cache_alloc+0x78/0x13c
>  (unreliable) [c000000009813310] [c00000000019bafc]
>  .alloc_buffer_head+0x2c/0x78 [c000000009813390] [c00000000019c99c]
>  .alloc_page_buffers+0x60/0x114 [c000000009813450] [c00000000019ca78]
>  .create_empty_buffers+0x28/0x140 [c0000000098134e0] [c00000000019f2ec]
>  .__block_prepare_write+0xe4/0x4f0 [c000000009813610] [c00000000019f94c]
>  .block_write_begin_newtrunc+0xa8/0x120 [c0000000098136d0]
>  [c00000000019fea0] .block_write_begin+0x34/0x8c [c000000009813770]
>  [c00000000022b458] .ext3_write_begin+0x13c/0x298 [c000000009813880]
>  [c000000000117500] .generic_file_buffered_write+0x13c/0x320
>  [c0000000098139b0] [c000000000119c80]
>  .__generic_file_aio_write+0x378/0x3dc [c000000009813ab0]
>  [c000000000119d68] .generic_file_aio_write+0x84/0xfc [c000000009813b60]
>  [c00000000016e460] .do_sync_write+0xac/0x10c
> [c000000009813ce0] [c00000000016f204] .vfs_write+0xd0/0x1dc
> [c000000009813d80] [c00000000016f418] .SyS_write+0x58/0xa0
> [c000000009813e30] [c0000000000085b4] syscall_exit+0x0/0x40
> Instruction dump:
> 38600000 409e0090 38000000 8b8d0212 980d0212 e96d0040 e93b0000 7ce95a14
> 7fe9582a 2fbf0000 419e0014 e81b001a <7c1f002a> 7c09592a 4800001c 7f46d378
> ---[ end trace f24cb0cb5729d2bb ]---
> 
> And few more of these. Previous snapshot release
>  2.6.35-rc1-git5(6c5de280b6...) was good.
> 
> Thanks
> -Sachin
> 

-- 
Maciej Rutecki
http://www.maciek.unixy.pl