linux-kernel - Re: linux-next: slab shrinkers: BUG at mm/list

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Message-Id: <20130708140419.d9079dd67111090beb6cef3d@linux-foundation.org>
Date:	Mon, 8 Jul 2013 14:04:19 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Dave Chinner <david@...morbit.com>,
	Glauber Costa <glommer@...il.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: slab shrinkers: BUG at mm/list_lru.c:92

On Mon, 8 Jul 2013 14:53:52 +0200 Michal Hocko <mhocko@...e.cz> wrote:

> > Good news! The test was running since morning and it didn't hang nor
> > crashed. So this really looks like the right fix. It will run also
> > during weekend to be 100% sure. But I guess it is safe to say
> 
> Hmm, it seems I was too optimistic or we have yet another issue here (I
> guess the later is more probable).
> 
> The weekend testing got stuck as well. 
> 
> The dmesg shows there were some hung tasks:

That looks like the classic "we lost an IO completion" trace.

I think it would be prudent to defer these patches into 3.12.
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