Message-ID: <4860365F.5000609@acm.org>
Date: Mon, 23 Jun 2008 17:48:47 -0600
From: Zan Lynx <zlynx@acm.org>
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To: Nick Piggin <nickpiggin@yahoo.com.au>
CC: Ryan Hope <rmh3093@gmail.com>, Peter Zijlstra <peterz@infradead.org>,
       linux-mm@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] Lockless patches cause hardlock under heavy IO
References: <48f7fe350806181415l4eba61b3i1d206de03147575e@mail.gmail.com> <1214147244.3223.307.camel@lappy.programming.kicks-ass.net> <48f7fe350806220818n52cc36e9v28bdc6cf2c4cf841@mail.gmail.com> <200806231229.42943.nickpiggin@yahoo.com.au>
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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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