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

From: Sachin Sant <[email-masked]>
Date: Sun, 06 Jun 2010 20:36:54 +0530

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

-- 

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Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
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