linux-kernel - Re: btrfs triggered lockdep WARN.

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Message-ID: <20130627153857.14981.14731@localhost.localdomain>
Date:	Thu, 27 Jun 2013 11:38:57 -0400
From:	Chris Mason <chris.mason@...ionio.com>
To:	Dave Jones <davej@...hat.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	<linux-btrfs@...r.kernel.org>
Subject: Re: btrfs triggered lockdep WARN.

Quoting Dave Jones (2013-06-27 11:19:22)
> On Thu, Jun 27, 2013 at 11:01:30AM -0400, Chris Mason wrote:
>  > Quoting Dave Jones (2013-06-27 10:58:24)
>  > > Another bug caused by this script. https://github.com/kernelslacker/io-tests/blob/master/setup.sh
>  > 
>  > I'm still struggling to reproduce that one here.  I've tried every
>  > variation I can think of but I'll try again.
>  
> Note that this is a different trace to the other post about that script.

Yeah, but I haven't hit anything unusual at all yet.

> 
>  > I really hope you don't already have CONFIG_DEBUG_PAGE_ALLOC turned on,
>  > maybe it will catch this?
> 
> I do. Though given this is lockdep complaining about what looks like
> memory corruption, it's probably not related.

Ok, could you please try this with some heavy memory pressure?  I'm
hoping to trigger a use-after-free that points us in the right
direction.

-chris

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