2.6.28-rc3 mem_cgroup panic

[Badari Pulavarty]

Hi Balbir,

I was running memory remove/add tests in a continuous loop.
I get following panic in mem_cgroup migration code. 

Is this a known issue ?

Thanks,
Badari


Unable to handle kernel paging request for data at address 0x027d7d80
Faulting instruction address: 0xc000000000105334
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=32 NUMA pSeries
Modules linked in:
NIP: c000000000105334 LR: c000000000105314 CTR: c0000000000bf6d0
REGS: c0000000e446b410 TRAP: 0300   Not tainted  (2.6.28-rc3)
MSR: 8000000000009032 <EE,ME,IR,DR>  CR: 24000448  XER: 00000020
DAR: 00000000027d7d80, DSISR: 0000000040000000
TASK = c0000000e4526cc0[4823] 'drmgr' THREAD: c0000000e4468000 CPU: 0
GPR00: 0000000000000001 c0000000e446b690 c000000000b33f10 00000000027d7d80 
GPR04: c000000000105314 c0000000000bf6d0 c0000000eafded40 0000000000000000 
GPR08: c000000000bd7fc0 0000000000000008 00000000027d7d80 c000000000bd7000 
GPR12: 0000000000004000 c000000000b58300 00000000200957bc 0000000000000000 
GPR16: 0000000000000000 c0000000e446b8f8 0000000000000000 c000000000adba20 
GPR20: 0000000000000000 0000000000000000 c0000000e4937cb8 00000000000ff000 
GPR24: 0000000000000000 00000000000000f2 fffffffffffffff4 c0000000ea10d748 
GPR28: c0000000e4937c80 c0000000e4937c80 c000000000aa9bc0 c0000000e446b690 
NIP [c000000000105334] .mem_cgroup_prepare_migration+0x70/0x160
LR [c000000000105314] .mem_cgroup_prepare_migration+0x50/0x160
Call Trace:
[c0000000e446b690] [c000000000105314] .mem_cgroup_prepare_migration+0x50/0x160 (unreliable)
[c0000000e446b730] [c000000000102770] .migrate_pages+0x12c/0x62c
[c0000000e446b880] [c000000000100558] .offline_pages+0x398/0x5ac
[c0000000e446b990] [c0000000001007b0] .remove_memory+0x44/0x60
[c0000000e446ba20] [c0000000003fdb90] .memory_block_change_state+0x198/0x230
[c0000000e446bad0] [c0000000003fe2b0] .store_mem_state+0xcc/0x144
[c0000000e446bb70] [c0000000003f0eb8] .sysdev_store+0x74/0xa4
[c0000000e446bc10] [c000000000172d54] .sysfs_write_file+0x128/0x1a4
[c0000000e446bcd0] [c000000000109330] .vfs_write+0xf0/0x1c4
[c0000000e446bd80] [c000000000109ccc] .sys_write+0x6c/0xb8
[c0000000e446be30] [c00000000000852c] syscall_exit+0x0/0x40
Instruction dump:
2f800000 409e00f0 7f83e378 48000871 60000000 48000018 7c210b78 7c421378 
e8030000 780907e1 4082fff0 38000001 <7d6018a8> 7d690378 7d2019ad 40a2fff4 
---[ end trace 719565d8677c8ae0 ]---
Unable to handle kernel paging request for data at address 0x027d7dd0
Faulting instruction address: 0xc0000000001040f0
Oops: Kernel access of bad area, sig: 11 [#2]
SMP NR_CPUS=32 NUMA pSeries
Modules linked in:
NIP: c0000000001040f0 LR: c0000000001040e4 CTR: c0000000000bf6d0
REGS: c0000000e446aa10 TRAP: 0300   Tainted: G      D     (2.6.28-rc3)
MSR: 8000000000009032 <EE,ME,IR,DR>  CR: 48000428  XER: 00000006
DAR: 00000000027d7dd0, DSISR: 0000000040000000
TASK = c0000000e4526cc0[4823] 'drmgr' THREAD: c0000000e4468000 CPU: 0
GPR00: c0000000001040e4 c0000000e446ac90 c000000000b33f10 00000000027d7dd0 
GPR04: c0000000001040e4 c0000000000bf6d0 0000001fdfe40797 0000000000000000 
GPR08: c000000000bd7fc0 0000000000000008 00000000027d7dd0 c000000000bd7000 
GPR12: c0000000e446ace0 c000000000b58300 c0000000e4382800 00000000100d0000 
GPR16: 00000000100d0000 fffffffffffffffb 0000000000000000 00000000100d0000 
GPR20: 000000000035eee6 c0000000e7c67b88 c000000000bf2f68 0000000000000000 
GPR24: 0000001fdfe40797 c0000000e42ab400 000000001002f000 0000000000000001 
GPR28: c0000000e4937cf0 00000000027d7dd0 c000000000aa9bc0 c0000000e446ac90 
NIP [c0000000001040f0] .__mem_cgroup_uncharge_common+0x60/0x20c
LR [c0000000001040e4] .__mem_cgroup_uncharge_common+0x54/0x20c
Call Trace:
[c0000000e446ac90] [c0000000001040e4] .__mem_cgroup_uncharge_common+0x54/0x20c (unreliable)
[c0000000e446ad30] [c0000000001045a0] .mem_cgroup_uncharge_page+0x50/0x68
[c0000000e446adc0] [c0000000000e50f0] .page_remove_rmap+0x190/0x1d4
[c0000000e446ae50] [c0000000000da8c8] .unmap_vmas+0x528/0x8f4
[c0000000e446af90] [c0000000000e0890] .exit_mmap+0xf0/0x1cc
[c0000000e446b040] [c0000000000640b0] .mmput+0x78/0x164
[c0000000e446b0e0] [c00000000006983c] .exit_mm+0x1a8/0x1d0
[c0000000e446b190] [c00000000006b6c8] .do_exit+0x22c/0x880
[c0000000e446b260] [c0000000000294d0] .die+0x1d0/0x1d4
[c0000000e446b310] [c0000000000312d8] .bad_page_fault+0xc8/0xe8
[c0000000e446b3a0] [c000000000005198] handle_page_fault+0x3c/0x5c
--- Exception: 300 at .mem_cgroup_prepare_migration+0x70/0x160
    LR = .mem_cgroup_prepare_migration+0x50/0x160
[c0000000e446b730] [c000000000102770] .migrate_pages+0x12c/0x62c
[c0000000e446b880] [c000000000100558] .offline_pages+0x398/0x5ac
[c0000000e446b990] [c0000000001007b0] .remove_memory+0x44/0x60
[c0000000e446ba20] [c0000000003fdb90] .memory_block_change_state+0x198/0x230
[c0000000e446bad0] [c0000000003fe2b0] .store_mem_state+0xcc/0x144
[c0000000e446bb70] [c0000000003f0eb8] .sysdev_store+0x74/0xa4
[c0000000e446bc10] [c000000000172d54] .sysfs_write_file+0x128/0x1a4
[c0000000e446bcd0] [c000000000109330] .vfs_write+0xf0/0x1c4
[c0000000e446bd80] [c000000000109ccc] .sys_write+0x6c/0xb8
[c0000000e446be30] [c00000000000852c] syscall_exit+0x0/0x40
Instruction dump:
7c9b2378 4bf04d99 60000000 e93e8018 80090060 2f800000 409e019c 7f83e378 
48001aa1 60000000 7c7d1b79 41820188 <e81d0000> 7809f7e3 40a2001c 48000178 
---[ end trace 719565d8677c8ae0 ]---
Fixing recursive fault but reboot is needed!


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