netdev - Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

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Date:	Tue, 22 Nov 2011 09:36:30 +0100
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"Alex,Shi" <alex.shi@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, tj@...nel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

On 2011.11.21 at 17:34 +0100, Markus Trippelsdorf wrote:
> On 2011.11.21 at 17:10 +0100, Markus Trippelsdorf wrote:
> > On 2011.11.21 at 16:48 +0100, Eric Dumazet wrote:
> > > Le lundi 21 novembre 2011 à 16:36 +0100, Markus Trippelsdorf a écrit :
> > > > On 2011.11.21 at 15:16 +0100, Eric Dumazet wrote:
> > > > > Le lundi 21 novembre 2011 à 14:15 +0100, Markus Trippelsdorf a écrit :
> > > > > 
> > > > > > I've enabled CONFIG_SLUB_DEBUG_ON and this is what happend:
> > > > > > 
> > > > > 
> > > > > Thanks
> > > > > 
> > > > > Please continue to provide more samples.
> > > > > 
> > > > > There is something wrong somewhere, but where exactly, its hard to say.
> > > > 
> > > > New sample. This one points to lib/idr.c:
> > > > 
> > > > =============================================================================
> > > > BUG idr_layer_cache: Poison overwritten
> > > > -----------------------------------------------------------------------------
> > > 
> > > Thanks, could you now add "CONFIG_DEBUG_PAGEALLOC=y" in your config as
> > > well ?
> > 
> > Sure. This one happend with CONFIG_DEBUG_PAGEALLOC=y:
> > 
> > =============================================================================
> > BUG task_struct: Poison overwritten
> > -----------------------------------------------------------------------------
> 
> And sometimes this one that I've reported earlier already:
> 
> (see: http://thread.gmane.org/gmane.linux.kernel/1215023 )
> 
>  ------------[ cut here ]------------
>  WARNING: at fs/sysfs/sysfs.h:195 sysfs_get_inode+0x136/0x140()
>  Hardware name: System Product Name
>  Pid: 1876, comm: slabinfo Not tainted 3.2.0-rc2-00274-g6fe4c6d #72
>  Call Trace:
>  [<ffffffff8106cac5>] warn_slowpath_common+0x75/0xb0
>  [<ffffffff8106cbc5>] warn_slowpath_null+0x15/0x20
>  [<ffffffff81163236>] sysfs_get_inode+0x136/0x140
>  [<ffffffff81164cef>] sysfs_lookup+0x6f/0x110
>  [<ffffffff811173f9>] d_alloc_and_lookup+0x39/0x80
>  [<ffffffff81118774>] do_lookup+0x294/0x3a0
>  [<ffffffff8111798a>] ? inode_permission+0x7a/0xb0
>  [<ffffffff8111a3f7>] do_last.isra.46+0x137/0x7f0
>  [<ffffffff8111ab76>] path_openat+0xc6/0x370
>  [<ffffffff81117606>] ? getname_flags+0x36/0x230
>  [<ffffffff810ec852>] ? handle_mm_fault+0x192/0x290
>  [<ffffffff8111ae5c>] do_filp_open+0x3c/0x90
>  [<ffffffff81127c8c>] ? alloc_fd+0xdc/0x120
>  [<ffffffff8110ce77>] do_sys_open+0xe7/0x1c0
>  [<ffffffff8110cf6b>] sys_open+0x1b/0x20
>  [<ffffffff814ccb7b>] system_call_fastpath+0x16/0x1b
>  ---[ end trace b1377eb8b131d37d ]---

Hm, the "sysfs: use rb-tree" thing hit again during boot. Could this be
the root cause of this all?

I wrote down the following:

RIP : rb_next

Trace:
 sysfs_dir_pos
 sysfs_readdir
 ? sys_ioctl
 vfs_readdir
 sys_getdents

-- 
Markus
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