linux-kernel - Re: [origin tree SLAB corruption #2] BUG kmalloc-64: Poison overwritten, INFO: Allocated in bdi_alloc

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Date:	Tue, 15 Sep 2009 09:51:00 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Eric Paris <eparis@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	James Morris <jmorris@...ei.org>, Thomas Liu <tliu@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [origin tree SLAB corruption #2] BUG kmalloc-64: Poison
	overwritten, INFO: Allocated in bdi_alloc_work+0x2b/0x100 age=175
	cpu=1 pid=3514

On Tue, Sep 15 2009, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> > > trying to pull in:
> > > 
> > >   git://git.kernel.dk/linux-2.6-block.git writeback
> > > 
> > > and see if it reproduces there? That path has been cleaned up 
> > > considerably there.
> > 
> > I gave it a test-pull - and the bug does not trigger anymore.
> > 
> > Note, that may not mean much: your tree is based on a fresh upstream 
> > tree so it pulled a lot of new stuff into -tip that i have yet to 
> > test/validate. It also changed the kernel image size/layout 
> > considerably and this bug seems to be a very narrow to hit race of 
> > sorts.
> 
> Btw., is there anything in your cleanups that could explain this bug? 
> Some list handling bug? A double free? Uninitialized memory? Race 
> between block IRQs and process context?

No that that I noticed, it was just a thought since that path has been
cleaned up and I have been looking at the newer tree only. I'll take a
good look at the current -git situation.

-- 
Jens Axboe

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