linux-kernel - Re: 2.6.24-rc7 lockdep warning when poweroff

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Message-ID: <20080115012402.GA2780@darkstar.te-china.tietoenator.com>
Date:	Tue, 15 Jan 2008 09:24:02 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.24-rc7 lockdep warning when poweroff

On Tue, Jan 15, 2008 at 08:31:48AM +0800, Dave Young wrote:
> On Jan 14, 2008 6:51 PM, Johannes Berg <johannes@...solutions.net> wrote:
> >
> > > The warning that triggered (lockdep.c:700) means that one class (key)
> > > was used with more than one name.
> >
> > Right.
> >
> > > Looking at cleanup_workqueue_thread(), the lock_acquire() there works on
> > > wq->lockdep_map, and that is only initialized at one spot:
> > > __create_workqueue_key(), thus it stands to reason that that was
> > > mis-used.
> >
> > Oh ok, yes, makes sense. Maybe something is generating a workqueue with
> > a name that's passed in but the key is statically from that place. I'll
> > try to find it.
> 
> I add some debug printk and found the names :
> 
> block_osm/exec_osm
> 
> in drivers/message/i2o
> 
> maybe this helps.

Not sure right or not, the following patch fixed the problem:

diff -upr linux/include/linux/workqueue.h linux.new/include/linux/workqueue.h
--- linux/include/linux/workqueue.h	2008-01-15 08:49:08.000000000 +0800
+++ linux.new/include/linux/workqueue.h	2008-01-15 08:49:42.000000000 +0800
@@ -154,7 +154,7 @@ __create_workqueue_key(const char *name,
 #ifdef CONFIG_LOCKDEP
 #define __create_workqueue(name, singlethread, freezeable)	\
 ({								\
-	static struct lock_class_key __key;			\
+	struct lock_class_key __key;			\
 								\
 	__create_workqueue_key((name), (singlethread),		\
 			       (freezeable), &__key);		\
> 
> Regards
> dave
> 
> >
> > johannes
> >
--
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