linux-kernel - Re: qla2xxx BUG: workqueue leaked lock or atomic

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Message-Id: <20070307114525.08265c33.akpm@linux-foundation.org>
Date:	Wed, 7 Mar 2007 11:45:25 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andre Noll <maan@...temlinux.org>
Cc:	Andrew Vasquez <andrew.vasquez@...gic.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	James Bottomley <James.Bottomley@...elEye.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Alasdair G Kergon <agk@...hat.com>,
	Adrian Bunk <bunk@...sta.de>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: qla2xxx BUG: workqueue leaked lock or atomic

On Wed, 7 Mar 2007 18:09:55 +0100 Andre Noll <maan@...temlinux.org> wrote:

> On 20:39, Andrew Morton wrote:
> > On Wed, 28 Feb 2007 16:37:22 +0100 Andre Noll <maan@...temlinux.org> wrote:
> > 
> > > On 16:18, Andre Noll wrote:
> > > 
> > > > With 2.6.21-rc2 I am unable to reproduce this BUG message. However,
> > > > writing to both raid systems at the same time via lvm still locks up
> > > > the system within minutes.
> > > 
> > > Screenshot of the resulting kernel panic:
> > > 
> > > 	http://systemlinux.org/~maan/shots/kernel-panic-21-rc2-huangho2.png
> > > 
> > 
> > It died in CFQ.  Please try a different IO scheduler.  Use something
> > like
> > 
> > 	echo deadline > /sys/block/sda/queue/scheduler
> > 
> > This could still be the old qla2xxx bug, or it could be a new qla2xxx bug,
> > or it could be a block bug, or it could be an LVM bug.
> 
> OK. I'm running with deadline right now. But I guess this kernel
> panic was caused by an LVM bug because lockdep reported problems with
> LVM. Nobody responded to my bug report on the LVM mailing list (see
> http://www.redhat.com/archives/linux-lvm/2007-February/msg00102.html).
> 
> Non-working snapshots and no help from the mailing list convinced me
> to ditch the lvm setup [1] in favour of linear software raid. This
> means I can't do lvm-related tests any more.

Sigh.

> BTW: Are ext3 filesystem sizes greater than 8T now officially
> supported?

I think so, but I don't know how much 16TB testing developers and
distros are doing - perhaps the linux-ext4 denizens can tell us?
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