linux-kernel - Re: next-20081119: general protection fault: get_next_timer

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Message-ID: <20081125000902.GA24251@us.ibm.com>
Date:	Mon, 24 Nov 2008 16:09:02 -0800
From:	malahal@...ibm.com
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Mike Anderson <andmike@...ux.vnet.ibm.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Alexander Beregalov <a.beregalov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-next@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, linux-scsi@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: next-20081119: general protection fault:
	get_next_timer_interrupt()

Thomas Gleixner [tglx@...utronix.de] wrote:
> On Mon, 24 Nov 2008, Mike Anderson wrote:
> > Thomas Gleixner <tglx@...utronix.de> wrote:
> > > Yeah, block could it be as well. Jens, Mike ?
> > 
> > I added a comment to bug 12020 on Thursday about a few other systems that
> > where seeing the signature shown in bug 12020. It appeared from debug that
> > there where a few paths that where adding timers for requests that where
> > not expected.
> > 
> > http://bugzilla.kernel.org/show_bug.cgi?id=12020
> > 
> > It would be good to know if the debug patch below effects your problem as while.
> > 
> > If it does we need to investigated a solution to resolve not adding a
> > timer for these requests.

The block timer code calls del_timer(), should it call del_timer_sync()?
It is possible although unlikely that you are hitting del_timer_sync vs
del_timer problem in the block timeout code. Can only be seen on SMP
systems though!

--Malahal.
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