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Date: Wed, 2 Oct 2002 11:45:25 +0200
From: Richard Zidlicky <rz@linux-m68k.org>
To: Daniel Phillips <phillips@arcor.de>
Cc: Jens Axboe <axboe@suse.de>, Rik van Riel <riel@conectiva.com.br>,
       zippel@linux-m68k.org, linux-m68k@lists.linux-m68k.org,
       linux-kernel@vger.kernel.org
Subject: Re: 2.4 mm trouble [possible lru race]
Message-ID: <20021002114524.A237@linux-m68k.org>
References: <Pine.LNX.4.44L.0210011356300.653-100000@duckman.distro.conectiva> <E17wQXN-0005vL-00@starship> <20021001173119.GY3867@suse.de> <E17wRKZ-0005vf-00@starship>
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In-Reply-To: <E17wRKZ-0005vf-00@starship>; from phillips@arcor.de on Tue, Oct 01, 2002 at 08:01:10PM +0200
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On Tue, Oct 01, 2002 at 08:01:10PM +0200, Daniel Phillips wrote:

> Richard, before I go making a test patch for you (it's not completely
> straightforward) can you confirm that your bug comes back when you back
> the lru race patch out?

bad luck, the disappearance of the bug was rather accidental - I have
switched to a different swap partition in the meantime. So backing out
the changes doesn't make the bug reappear, restoring previous IDE
configuration does.

Very likely interrupt related trouble, somewhere a missing spinlock_irqsave 
perhaps. The bug manifests itself so that pages from wrong procesess get 
swapped in for some process, however I have also had the luck to crash the 
kernel (no Oops) so it is not likely to be one of the TLB/cache problems.

What strikes me is that is always related to swap and I 've never got any
strange dmesg so far.

Richard
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