linux-kernel - Re: Simple script that locks up my box with recent kernels

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Message-ID: <20061122105703.GZ8055@kernel.dk>
Date:	Wed, 22 Nov 2006 11:57:03 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jesper Juhl <jesper.juhl@...il.com>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: Simple script that locks up my box with recent kernels

On Wed, Nov 22 2006, Jesper Juhl wrote:
> On 22/11/06, Jens Axboe <jens.axboe@...cle.com> wrote:
> >On Tue, Nov 21 2006, Linus Torvalds wrote:
> >> I don't think we use any irq-disable locking in the VM itself, but I 
> >could
> >> imagine some nasty situation with the block device layer getting into a
> >> deadlock with interrupts disabled when it runs out of queue entries and
> >> cannot allocate more memory..
> >
> >Not likely. Request allocation is done with GFP_NOIO and backed by a
> >memory pool, so as long the vm doesn't go totally nuts because
> >__GFP_WAIT is set, we should be safe there. If it did go crazy, I
> >suspect a sysrq-t would still work.
> >
> >If bouncing is involved for swap, we do have a potential deadlock issue
> >that isn't fixed yet. I just whipped up this completely untested patch,
> >it should shed some light on that issue.
> >
> Thanks Jens, I'll apply that later tonight and force a few lockups and
> see if I get any extra details with that patch.

Can you post a full dmesg too, as well as clarify which device holds the
swap space?

-- 
Jens Axboe

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