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Date: Wed, 1 Feb 2006 12:02:28 +0100
From: Jens Axboe <axboe@suse.de>
To: Dave Jones <davej@redhat.com>, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: more cfq spinlock badness
Message-ID: <20060201110228.GS4215@suse.de>
References: <20060131063938.GA1876@redhat.com> <20060131090944.GU4215@suse.de> <20060131173601.GA7204@redhat.com>
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On Tue, Jan 31 2006, Dave Jones wrote:
> On Tue, Jan 31, 2006 at 10:09:45AM +0100, Jens Axboe wrote:
>  > On Tue, Jan 31 2006, Dave Jones wrote:
>  > > Not seen this break for a while, but I just hit it again in 2.6.16rc1-git4.
>  > > 
>  > > 		Dave
>  > > 
>  > > BUG: spinlock bad magic on CPU#0, pdflush/1128
>  > >  lock: ffff81003a219000, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
>  > > 
>  > > Call Trace: <ffffffff80206edc>{spin_bug+177} <ffffffff80207045>{_raw_spin_lock+25}
>  > >        <ffffffff801fea4a>{cfq_exit_single_io_context+85} <ffffffff801ff9a6>{cfq_exit_io_context+24}
>  > >        <ffffffff801f79b0>{exit_io_context+137} <ffffffff80135fbc>{do_exit+182}
>  > >        <ffffffff8010ba49>{child_rip+15} <ffffffff80146087>{keventd_create_kthread+0}
>  > >        <ffffffff8014629c>{kthread+0} <ffffffff8010ba3a>{child_rip+0}
>  > > Kernel panic - not syncing: bad locking
>  > 
>  > Again, which devices have you used?
> 
> nothing special (Ie, no usb bits, just the onboard ata_piix SATA)
> 
>  > Did it happen at shutdown, or?
> 
> whislt starting up a bunch of gnome panel applets.
> 
>  > Did the ub bug get fixed
> 
> yes
> 
>  > if you are using that? The bug above has in the
>  > past always been able to be explained by a driver destroying a structure
>  > embedding the queue lock before the queue is dead.
> 
> as there were no ub devices plugged in at the time, I think
> Pete is off the hook for this one.

The ub fix hasn't been merged yet. Just trying to be absolutely certain
that you didn't have that loaded?

-- 
Jens Axboe

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