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    SubjectRe: 2.6.17-rc4-mm1
    Hi Andrew

    It seems latest kernels have a problem in kmem_cache_destroy()

    On a dual opteron machine (NUMA), its quite easy do trigger the bug :
    doing a oprofile session like :

    opcontrol --setup --event=CPU_CLK_UNHALTED:100000
    --vmlinux=/usr/src/linux-2.6.17-rc4-mm1/vmlinux
    ...
    opcontrol --dump
    ...
    opcontrol --deinit <<<-- Triggers the bug

    slab error in kmem_cache_destroy(): cache `dcookie_cache': Can't free
    all objects

    Call Trace: <ffffffff80278aa4>{kmem_cache_destroy+212}
    <ffffffff802bc559>{dcookie_unregister+345}
    <ffffffff803bbe7a>{event_buffer_release+26}
    <ffffffff8027cee2>{__fput+98} <ffffffff80279ecd>{filp_close+93}
    <ffffffff8023003e>{put_files_struct+110}
    <ffffffff8023143a>{do_exit+650}
    <ffffffff802f58f1>{__up_write+33}
    <ffffffff80231bb8>{do_group_exit+200}
    <ffffffff802097ce>{system_call+126}

    # grep dcookie_cache /proc/slabinfo
    dcookie_cache 0 0 32 101 1 : tunables 120 60
    8 : slabdata 0 0 0


    This problem is annoying, because in the oprofile case, we must reboot
    the machine to be able to start a new profile session.

    Eric



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