linux-kernel - Re: INFO: possible circular locking dependency at cleanup_workqueue

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Date:	Sun, 24 May 2009 20:48:10 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Johannes Berg <johannes@...solutions.net>,
	Alan Stern <stern@...land.harvard.edu>,
	Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: INFO: possible circular locking dependency at
 cleanup_workqueue_thread

On Sun, 24 May 2009 13:09:13 +0200
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> On Sunday 24 May 2009, Ming Lei wrote:
> > 于 Sun, 24 May 2009 01:20:29 +0200
> > "Rafael J. Wysocki" <rjw@...k.pl> wrote:

> > [lm@...ux-lm linux-2.6]$ patch -p1
> > <  ../patch_rx/INFO_possible_circular_locking_dependency_at_cleanup_workqueue_thread.patch
> > patching file kernel/power/disk.c Hunk #1 succeeded at 215 with
> > fuzz 2. Hunk #3 succeeded at 278 with fuzz 1.
> > Hunk #4 FAILED at 343.
> > Hunk #5 succeeded at 396 with fuzz 2 (offset -4 lines).
> > Hunk #6 FAILED at 454.
> > Hunk #7 succeeded at 485 with fuzz 2.
> > 2 out of 7 hunks FAILED -- saving rejects to file
> > kernel/power/disk.c.rej patching file kernel/power/main.c
> > Hunk #1 succeeded at 289 with fuzz 1 (offset 18 lines).
> > patching file drivers/base/power/main.c
> > Hunk #3 succeeded at 616 with fuzz 2.
> > Hunk #4 succeeded at 625 with fuzz 2.
> > patching file kernel/kexec.c
> > Hunk #1 succeeded at 1451 with fuzz 2.
> > Hunk #2 succeeded at 1488 with fuzz 2.
> 
> The patch applies to the mainline, since it'll be a 2.6.30 candidate
> if it's confirmed to fix the problem.

After applying the patch against 2.6.30-rc7, my dell d630 box can resume
from suspend(s2ram) or hibernation successfully, and lockdep does not 
complain with the kind of message in

	http://bugzilla.kernel.org/show_bug.cgi?id=13245.

Another thing, during resume from hibernation, I can find the following
messages:

	[    1.849584] device: 'network_throughput': device_add
	[    1.849630] PM: Adding info for No Bus:network_throughput
	[    1.849788] PM: Resume from disk failed.
 
I do not known if there is really something wrong in PM, after all my
box can work as before. Attachment is the dmesg info.

Thanks.

-- 
Lei Ming

Download attachment "dmesg.tar.gz" of type "application/x-gzip" (58118 bytes)