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

    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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