lkml.org 
[lkml]   [2014]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: eventpoll __list_del_entry corruption
    On 05/15/2014 02:11 PM, Peter Zijlstra wrote:
    > On Mon, May 12, 2014 at 11:42:33AM -0400, Sasha Levin wrote:
    >> Hi all,
    >>
    >> While fuzzing with trinity inside a KVM tools guest running the latest -next
    >> kernel I've stumbled on the following spew. Maybe related to the very recent
    >> change in freeing on task exit?
    >>
    >
    > While fuzzing to reproduce; I hit this one, is it a known one or should
    > I go poke the right people about it?
    >
    > ---
    > [ 5823.689985] ------------[ cut here ]------------
    > [ 5823.690004] WARNING: CPU: 3 PID: 2508 at /usr/src/linux-2.6/lib/list_debug.c:59 __list_del_entry+0xa1/0xd0()
    > [ 5823.690004] list_del corruption. prev->next should be ffff880131111de0, but was 6b6b6b6b6b6b6b6b
    > [ 5823.690004] Modules linked in:
    > [ 5823.690004] CPU: 3 PID: 2508 Comm: trinity-main Not tainted 3.15.0-rc5-01700-g505011124ad0-dirty #1072
    > [ 5823.690004] Hardware name: Supermicro X8DTN/X8DTN, BIOS 4.6.3 01/08/2010
    > [ 5823.690004] 0000000000000009 ffff880432709ca8 ffffffff81681aa2 ffff880432709cf0
    > [ 5823.690004] ffff880432709ce0 ffffffff8109807c ffff880131111de0 ffff880131111dc8
    > [ 5823.690004] 0000000000000286 ffff8800b9dd5618 ffff88023699b720 ffff880432709d40
    > [ 5823.690004] Call Trace:
    > [ 5823.690004] [<ffffffff81681aa2>] dump_stack+0x4e/0x7a
    > [ 5823.690004] [<ffffffff8109807c>] warn_slowpath_common+0x8c/0xc0
    > [ 5823.690004] [<ffffffff8109816c>] warn_slowpath_fmt+0x4c/0x50
    > [ 5823.690004] [<ffffffff810ec8bf>] ? do_raw_spin_lock+0x13f/0x160
    > [ 5823.690004] [<ffffffff8138c661>] __list_del_entry+0xa1/0xd0
    > [ 5823.690004] [<ffffffff8138c69d>] list_del+0xd/0x30
    > [ 5823.690004] [<ffffffff810dfa71>] remove_wait_queue+0x31/0x50
    > [ 5823.690004] [<ffffffff812152aa>] ep_unregister_pollwait.isra.9+0x6a/0xb0
    > [ 5823.690004] [<ffffffff81215268>] ? ep_unregister_pollwait.isra.9+0x28/0xb0
    > [ 5823.690004] [<ffffffff8121531f>] ep_remove+0x2f/0xe0
    > [ 5823.690004] [<ffffffff81215705>] eventpoll_release_file+0x65/0xa0
    > [ 5823.690004] [<ffffffff811cf259>] __fput+0x1d9/0x1e0
    > [ 5823.690004] [<ffffffff811cf2ae>] ____fput+0xe/0x10
    > [ 5823.690004] [<ffffffff810b91f4>] task_work_run+0xc4/0xe0
    > [ 5823.690004] [<ffffffff8109a544>] do_exit+0x2d4/0xa90
    > [ 5823.690004] [<ffffffff813825c4>] ? lockdep_sys_exit_thunk+0x35/0x67
    > [ 5823.690004] [<ffffffff8109ae2c>] do_group_exit+0x4c/0xc0
    > [ 5823.690004] [<ffffffff8109aeb7>] SyS_exit_group+0x17/0x20
    > [ 5823.690004] [<ffffffff8168a2c2>] system_call_fastpath+0x16/0x1b
    > [ 5823.690004] ---[ end trace 515b7fa3169c0906 ]---
    >

    Dave reported something similar to that last year(!) and that never got fixed
    AFAIK: https://lkml.org/lkml/2013/10/14/353.


    Thanks,
    Sasha

    [unhandled content-type:application/pgp-signature]
    \
     
     \ /
      Last update: 2014-05-15 21:01    [W:4.168 / U:0.048 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site