On Wed, Sep 19, 2007 at 02:36:04PM -0700, Christoph Lameter wrote:
> catting
>
> alloc_calls
>
> and
> free_calls
>
> will perform a global scan over all objects to determine the callers.
> Before we do that we have to flush the per cpu slabs. The trace shows that
> one of the errors was detected in there and the other one probably later.
>
> So I would think that this is an actual memory corruption issue on your
> system and the /sys/slab stuff works fine. slabinfo -v will perform a more
> details scan to help you located the problem.
OK, I do clean boot, ssh to box, then sudo slabinfo -v.
=============================================================================
BUG kmalloc-16: Object padding overwritten
-----------------------------------------------------------------------------
INFO: 0xffff810100fd8998-0xffff810100fd8999. First byte 0xa7 instead of 0x5a
INFO: Allocated in sysfs_new_dirent+0x100/0x120 age=11055 cpu=0 pid=3474
INFO: Freed in kobject_uevent_env+0x123/0x430 age=11055 cpu=0 pid=3474
INFO: Slab 0xffff810004837740 used=28 fp=0xffff810100fd89a0 flags=0x8000000000000083
INFO: Object 0xffff810100fd8948 @offset=2376 fp=0xffff810100fd89a0
Bytes b4 0xffff810100fd8938: f1 f9 fb ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a ñùûÿ....ZZZZZZZZ
Object 0xffff810100fd8948: 73 75 62 73 79 73 74 65 6d 00 6b 6b 6b 6b 6b a5 subsystem.kkkkk¥
Redzone 0xffff810100fd8958: cc cc cc cc cc cc cc cc ÌÌÌÌÌÌÌÌ
Padding 0xffff810100fd8998: a7 5e 5a 5a 5a 5a 5a 5a §^ZZZZZZ
Call Trace:
[<ffffffff802827c8>] check_bytes_and_report+0xb8/0x100
[<ffffffff80282c34>] check_object+0x234/0x270
[<ffffffff80282e51>] validate_slab_slab+0x1e1/0x280
[<ffffffff8028591e>] validate_store+0xde/0x1c0
[<ffffffff802819e7>] slab_attr_store+0x27/0x30
[<ffffffff802cc9da>] sysfs_write_file+0xca/0x140
[<ffffffff80288d2d>] vfs_write+0xad/0xe0
[<ffffffff80289313>] sys_write+0x53/0x90
[<ffffffff8020bcae>] system_call+0x7e/0x83
FIX kmalloc-16: Restoring 0xffff810100fd8998-0xffff810100fd8999=0x5a
=============================================================================
BUG kmalloc-16: Object padding overwritten
-----------------------------------------------------------------------------
INFO: 0xffff810101b45310-0xffff810101b45311. First byte 0xd3 instead of 0x5a
INFO: Allocated in kobject_get_path+0x57/0xc0 age=18405 cpu=1 pid=2006
INFO: Freed in kobject_uevent_env+0x123/0x430 age=18405 cpu=1 pid=2006
INFO: Slab 0xffff81000485f718 used=8 fp=0xffff810101b45318 flags=0x8000000000000083
INFO: Object 0xffff810101b452c0 @offset=704 fp=0xffff810101b45370
Bytes b4 0xffff810101b452b0: db f9 fb ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a Ûùûÿ....ZZZZZZZZ
Object 0xffff810101b452c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk¥
Redzone 0xffff810101b452d0: bb bb bb bb bb bb bb bb »»»»»»»»
Padding 0xffff810101b45310: d3 5e 5a 5a 5a 5a 5a 5a Ó^ZZZZZZ
Call Trace:
[<ffffffff802827c8>] check_bytes_and_report+0xb8/0x100
[<ffffffff80282c34>] check_object+0x234/0x270
[<ffffffff80282dcf>] validate_slab_slab+0x15f/0x280
[<ffffffff8028591e>] validate_store+0xde/0x1c0
[<ffffffff802819e7>] slab_attr_store+0x27/0x30
[<ffffffff802cc9da>] sysfs_write_file+0xca/0x140
[<ffffffff80288d2d>] vfs_write+0xad/0xe0
[<ffffffff80289313>] sys_write+0x53/0x90
[<ffffffff8020bcae>] system_call+0x7e/0x83
FIX kmalloc-16: Restoring 0xffff810101b45310-0xffff810101b45311=0x5a
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