linux-kernel - Re: [BUG] Lockless patches cause hardlock under heavy IO

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Message-Id: <200806231229.42943.nickpiggin@yahoo.com.au>
Date:	Mon, 23 Jun 2008 12:29:42 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	"Ryan Hope" <rmh3093@...il.com>
Cc:	"Peter Zijlstra" <peterz@...radead.org>, linux-mm@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Lockless patches cause hardlock under heavy IO

On Monday 23 June 2008 01:18, Ryan Hope wrote:
> Well in the current version of the patchset we are using, one user
> would start playing some game (disabling "Disable Heap Randomization"
> fixed the hardlocks for him... the other user got hardlocks when
> copying an ISO from a reiser4 partition to a reiserfs partition
> (disabling swap fixed the issue for him).

Hmm, nobody has reported such a hang with -mm yet, so maybe it
is another interaction in the patchset. OTOH, probably nobody
much uses -mm and reiser4, and reiser4 does lots of weird fiddling
with pagecache so it could be broken in -mm even.

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