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

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Message-ID: <9a8748490611220255v53bc667y74b05e2b69281f25@mail.gmail.com>
Date:	Wed, 22 Nov 2006 11:55:08 +0100
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Jens Axboe" <jens.axboe@...cle.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 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.

-- 
Jesper Juhl <jesper.juhl@...il.com>
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