From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: SLUB cifs_request: kmem_cache_destroy called for cache that
 still has objects.
Date: Wed, 16 May 2012 07:02:20 -0400
Message-ID: <20120516070220.3d1d0806@tlielax.poochiereds.net>
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Cc: Steve French <smfrench-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
To: Suresh Jayaraman <sjayaraman-IBi9RG/b67k@public.gmane.org>
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On Wed, 16 May 2012 11:41:39 +0530
Suresh Jayaraman <sjayaraman-IBi9RG/b67k@public.gmane.org> wrote:

> On 05/16/2012 09:30 AM, Steve French wrote:
> > I don't see that on my rc7 system and I have slub debugging and
> > various other debugging options on in my rc7 config.  Let me know if
> > you find a way to reproduce it or want me to try with your config.
> > 
> > On Tue, May 15, 2012 at 7:46 PM, Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> >> I saw this today when unplugging cifs.ko in a stock -rc7 kernel. I
> >> never mounted any cifs mounts, so this is entirely due to module
> >> initialization as far as I can tell:
> >>
> >> [  464.776843] SLUB cifs_request: kmem_cache_destroy called for cache that still has objects.
> >> [  464.779071] Pid: 4738, comm: rmmod Not tainted 3.4.0-0.rc7.git0.1.fc18.x86_64 #1
> >> [  464.780243] Call Trace:
> >> [  464.780433]  [<ffffffff8116b53a>] kmem_cache_destroy+0x2ba/0x360
> >> [  464.780870]  [<ffffffffa00d6469>] cifs_destroy_request_bufs+0x21/0x3b [cifs]
> >> [  464.781397]  [<ffffffffa00d66a6>] exit_cifs+0x30/0x98a [cifs]
> >> [  464.781944]  [<ffffffff810b4a3e>] sys_delete_module+0x16e/0x2d0
> >> [  464.782482]  [<ffffffff8117c186>] ? filp_close+0x66/0xa0
> >> [  464.782903]  [<ffffffff81603769>] system_call_fastpath+0x16/0x1b
> >>
> >> ...any ideas?
> 
> Sounds to me like a slub problem affecting random modules that could be
> fixed by this patch
> 
>   http://comments.gmane.org/gmane.linux.kernel.mm/78106
> 
> If you are able to reliably reproduce, it is worth giving the patch a
> shot. But, I could be totally wrong too...
> 

Thanks for the pointer. That seems to have fixed it. I'll see if I can
reply to the thread and give them a "Tested-by" as well...

Thanks!
-- 
Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>