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    SubjectRe: 2.6.32-rc6 BUG at mm/slab.c:2869!
    On Thu, Aug 20, 2009 at 02:02:49PM +0200, Vegard Nossum wrote:
    > > I'll try that and kmemcheck next.
    > Hm, I'm afraid kmemcheck gives some known false positives related to
    > bitfields in ext4 code, so in the case that something turned up, it
    > might be hard to distinguish it from those false positives.

    Well I didn't get anything from ext4 so far. I did hit one with

    WARNING: kmemcheck: Caught 32-bit read from freed memory (f34a443c)
    a a a a a a a a a a a a a a a a a a a a a a a a f f f f f f f f

    Pid: 2745, comm: fsck.ext4 Not tainted (2.6.31-rc6 #2) MacBook1,1
    EIP: 0060:[<c10f3656>] EFLAGS: 00010217 CPU: 0
    EIP is at inotify_handle_event+0x76/0xc0
    EAX: f34a443c EBX: f34a4438 ECX: 00000000 EDX: f6732000
    ESI: f6559764 EDI: 00000000 EBP: f6733f0c ESP: c1527450
    DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
    CR0: 8005003b CR2: f6c046d4 CR3: 367fb000 CR4: 000026d0
    DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
    DR6: ffff4ff0 DR7: 00000400
    [<c10f0d78>] fsnotify+0xa8/0x130
    [<c10c5e11>] __fput+0xb1/0x1e0
    [<c10c5f55>] fput+0x15/0x20
    [<c10c2ca7>] filp_close+0x47/0x80
    [<c10c2d54>] sys_close+0x74/0xc0
    [<c1002ec8>] sysenter_do_call+0x12/0x36
    [<ffffffff>] 0xffffffff

    I think that is list_empty() here where %eax is list_head
    and event_list->next is the read location... which definitely
    doesn't look like a pointer, if I'm reading it correctly.


    /* did event_priv get attached? */
    if (list_empty(&fsn_event_priv->event_list))
    143: 8d 43 04 lea 0x4(%ebx),%eax

    event_priv = kmem_cache_alloc(event_priv_cachep, GFP_KERNEL);
    if (unlikely(!event_priv))
    return -ENOMEM;

    fsn_event_priv = &event_priv->fsnotify_event_priv_data;
    146: 39 43 04 cmp %eax,0x4(%ebx) <=== read here
    149: 74 1d je 168 <inotify_handle_event+0x98>

    Bob Copeland %%

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      Last update: 2009-08-21 04:09    [W:0.024 / U:0.808 seconds]
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