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

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Message-ID: <4860365F.5000609@acm.org>
Date:	Mon, 23 Jun 2008 17:48:47 -0600
From:	Zan Lynx <zlynx@....org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	Ryan Hope <rmh3093@...il.com>,
	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

Nick Piggin wrote:
> 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.

I have been running and testing -mm with reiser4 for a couple years now.
 I haven't been able to run -mm recently because I've been hitting the
copy_user bug Linus fixed for AMD64 but Andrew hasn't updated yet (no
complaints, Andrew) and I'm too lazy to manually patch.
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