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

From: Zan Lynx
Date: Mon Jun 23 2008 - 20:14:26 EST


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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