From: Alexey Dobriyan <adobriyan@gmail.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: akpm@linux-foundation.org, James.Bottomley@hansenpartnership.com,
linux-scsi@vger.kernel.org, axboe@kernel.dk
Subject: Re: 2.6.39-rc6: cdrecord oops
Date: Wed, 4 May 2011 22:45:56 +0300 [thread overview]
Message-ID: <20110504194555.GA4492@p183> (raw)
In-Reply-To: <BANLkTi=-Qv4eUbhS0QGdyX9Q8oQ8VYcD5A@mail.gmail.com>
On Wed, May 04, 2011 at 12:32:50PM -0700, Linus Torvalds wrote:
> On Wed, May 4, 2011 at 12:07 PM, Alexey Dobriyan <adobriyan@gmail.com> wrote:
> > Got one at the very end of burning session (haven't tried to reproduce yet).
> > Apparently happened when cdrecord tried to open the door.
> >
> > __lock_acquire
> > lock_acquire
> > _raw_spin_lock_irq
> > blk_get_request
>
> Hmm. That would be the
>
> spin_lock_irq(q->queue_lock);
>
> in there, I'm not seeing any other spinlock.
>
> > scsi_execute
> > scsi_set_medium_removal
> > sr_lock_door
> > cdrom_release
> > sr_block_release
> > __blk_dev_put
> > blkdev_put
> > blkdev_close
> > fput
> > filp_close
> > sys_close
> >
> > comm: cdrecord
> > RAX was small number like 0x46(?)
> > RBX 6b6b6b6b6b6b6b83
> > RDI 6b6b6b6b6b6b6b83
>
> And that implies that 'q' has been free'd before it's used, and you
> have SLUB-debugging turned on.
>
> > This model is USB device.
>
> Hmm. It looks a bit odd that cdrom_release() does the ->release call
> before it does the ->tray_move thing, but I don't think that's it.
>
> Jens/James: What's the sequence to blk_cleanup_queue() for a SCSI
> CD-ROM? It really does look like we're releasing the queue before
> we're done with it.
Second time, burning finished to the end successfully.
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prev parent reply other threads:[~2011-05-04 19:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-04 19:07 2.6.39-rc6: cdrecord oops Alexey Dobriyan
2011-05-04 19:32 ` Linus Torvalds
2011-05-04 19:45 ` Alexey Dobriyan [this message]
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