linux-kernel - Re: [GIT BISECT] BUG kmalloc-8192: Object already free from kmem_cache

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Date:	Sun, 13 Sep 2009 23:13:05 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Danny Feng <dfeng@...hat.com>
Cc:	cl@...ux-foundation.org, penberg@...helsinki.fi, mingo@...e.hu,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [GIT BISECT] BUG kmalloc-8192: Object already free from
 kmem_cache_destroy

On Mon, 2009-09-14 at 09:52 +0800, Danny Feng wrote:
> On 09/14/2009 07:11 AM, Eric Paris wrote:
> > On Sun, 2009-09-13 at 14:33 -0400, Eric Paris wrote:
> >> 2a38a002fbee06556489091c30b04746222167e4 is first bad commit
> >> commit 2a38a002fbee06556489091c30b04746222167e4
> >> Author: Xiaotian Feng<dfeng@...hat.com>
> >> Date:   Wed Jul 22 17:03:57 2009 +0800
> >>
> >>      slub: sysfs_slab_remove should free kmem_cache when debug is enabled
> >>
> >>      kmem_cache_destroy use sysfs_slab_remove to release the kmem_cache,
> >>      but when CONFIG_SLUB_DEBUG is enabled, sysfs_slab_remove just release
> >>      related kobject, the whole kmem_cache is missed to release and cause
> >>      a memory leak.
> >>
> >>      Acked-by: Christoph Lameer<cl@...ux-foundation.org>
> >>      Signed-off-by: Xiaotian Feng<dfeng@...hat.com>
> >>      Signed-off-by: Pekka Enberg<penberg@...helsinki.fi>
> >>
> >> CONFIG_SLUB_DEBUG=y
> >> CONFIG_SLUB=y
> >> CONFIG_SLUB_DEBUG_ON=y
> >> # CONFIG_SLUB_STATS is not set
> >
> > I also had problems destroying a kmem_cache in a security_initcall()
> > function which had a different backtrace (it's what made me create the
> > module and bisect.)   So be sure to let me know what you find so I can
> > be sure that we fix that place as well   (I believe that was a kref
> > problem rather than a double free)
> >
> > -Eric
> >
> >
> Could you please tell me the tree you're using? I'll debug on it first...

I was looking at the linux-next tree from Sept 11

http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=summary

-Eric

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