[Bug 482] New: slab error in check_poison_obj(): cache `task_struct': object was modified after freeing

From: Martin J. Bligh (mbligh@aracnet.com)
Date: Fri Mar 21 2003 - 12:17:58 EST

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http://bugme.osdl.org/show_bug.cgi?id=482

           Summary: slab error in check_poison_obj(): cache `task_struct':
                    object was modified after freeing
    Kernel Version: 2.5.65
            Status: NEW
          Severity: normal
             Owner: akpm@digeo.com
         Submitter: jochen@jochen.org

Distribution: Debian Sarge
Hardware Environment: IBM Thinkpad 600

Problem Description:

The kernel log contains:
ALSA sound/isa/cs423x/cs4236_lib.c:302: CS4236: [0x538] C1 (version) = 0xe8, ext = 0xe8
Slab corruption: start=c46acd60, expend=c46ad36f, problemat=c46acd68
Data: ********6A
***************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************
*********************************************************************************************************************************************************************************************************************! *************************************************************************************************************************************************************************************************************************************************************************<7>eth0: no IPv6 routers present
*****************************************************************************************************************************************************************************************************************************************************************************************************************A5
Next: 01 00 00 00 00 00 3C C4 04 00 00 00 00 00 00 00 00 00 00 00 FF FF FF FF 7B 00 00 00 78 00 00 00
slab error in check_poison_obj(): cache `task_struct': object was modified after freeing
Call Trace:
[<c0130a7d>] __slab_error+0x21/0x28
[<c0130e6c>] check_poison_obj+0x174/0x180
[<c0131fc9>] kmem_cache_alloc+0x8d/0x128
[<c0116a04>] dup_task_struct+0x70/0xd0
[<c0116a04>] dup_task_struct+0x70/0xd0
[<c0117475>] copy_process+0x99/0xb40
[<c0117f96>] do_fork+0x7a/0x148
[<c01077c0>] sys_fork+0x18/0x28
[<c0108d3b>] syscall_call+0x7/0xb

Steps to reproduce:
This is when booting the system; I've not yet rebooted and will try again.

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