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

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Message-ID: <20070308103508.GD9671@kernel.dk>
Date:	Thu, 8 Mar 2007 11:35:08 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
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>
Subject: Re: qla2xxx BUG: workqueue leaked lock or atomic

On Thu, Mar 08 2007, Andre Noll wrote:
> On 10:36, Jens Axboe wrote:
> > - Edit .config and set CONFIG_DEBUG_INFO=y (near the bottom)
> > - make oldconfig
> > - rm block/cfq-iosched.o
> > - make block/cfq-iosched.o
> > - gdb block/cfq-iosched.o
> > 
> > (gdb) l *cfq_dispatch_insert+0x28
> > 
> > and see what that says. Should not take you more than a minute or so,
> > would appreciate it!
> 
> No problem, here we go:
> 
> # gdb block/cfq-iosched.o
> GNU gdb 6.4-debian
> Copyright 2005 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "x86_64-linux-gnu"...Using host libthread_db library "/lib/libthread_db.so.1".
> 
> (gdb) l *cfq_dispatch_insert+0x28
> 0xcf8 is in cfq_dispatch_insert (block/cfq-iosched.c:865).
> 860     }
> 861
> 862     static void cfq_dispatch_insert(request_queue_t *q, struct request *rq)
> 863     {
> 864             struct cfq_data *cfqd = q->elevator->elevator_data;
> 865             struct cfq_queue *cfqq = RQ_CFQQ(rq);
> 866
> 867             cfq_remove_request(rq);
> 868             cfqq->on_dispatch[rq_is_sync(rq)]++;
> 869             elv_dispatch_sort(q, rq);

Ok, so it's ->next_rq being NULL or invalid. Similar to the report from
Dan last week, that's a bit worrisome. I'll have to look further into
that.

-- 
Jens Axboe

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