WARNING: CPU: 2 PID: 4415 at lib/idr.c:527 idr_remove.part.6+0x243/0x250()

[Tejun Heo]

On Wed, Feb 12, 2014 at 09:33:23AM +0100, poma wrote:
> 
> Ahoy!
> 
> My trace is the last one, therefore per LIFO I am sending this report to
> you.
> 
>  ------------[ cut here ]------------
>  WARNING: CPU: 2 PID: 4415 at lib/idr.c:527 idr_remove.part.6+0x243/0x250()
>  idr_remove called for id=136 which is not allocated.
>  CPU: 2 PID: 4415 Comm: systemd Not tainted 3.12.10-300.fc20.x86_64 #1
>  Call Trace:
>   [<ffffffff81667ed5>] dump_stack+0x45/0x56
>   [<ffffffff8106903d>] warn_slowpath_common+0x7d/0xa0
>   [<ffffffff810690ac>] warn_slowpath_fmt+0x4c/0x50
>   [<ffffffff81304073>] idr_remove.part.6+0x243/0x250
>   [<ffffffff811c458c>] ? d_walk+0xdc/0x2a0
>   [<ffffffff8130408d>] idr_remove+0xd/0x10
>   [<ffffffff810defa6>] cgroup_destroy_css_killed+0x46/0x70
>   [<ffffffff810e1c98>] cgroup_destroy_locked+0x2d8/0x310
>   [<ffffffff810e1cf2>] cgroup_rmdir+0x22/0x40
>   [<ffffffff811bc108>] vfs_rmdir+0xa8/0x100
>   [<ffffffff811bc2dd>] do_rmdir+0x17d/0x1d0
>   [<ffffffff81087b6c>] ? task_work_run+0xac/0xe0
>   [<ffffffff81012a21>] ? do_notify_resume+0x61/0xa0
>   [<ffffffff811bf616>] SyS_rmdir+0x16/0x20
>   [<ffffffff81676ea9>] system_call_fastpath+0x16/0x1b
>  ---[ end trace 4ebc2893b27b190d ]---

Sounds simliar to the issue fixed by the following patch.

  http://lkml.kernel.org/g/52F9D9DA.7040108@huawei.com

Thanks.

-- 
tejun