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

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Message-Id: <1200307896.5887.42.camel@johannes.berg>
Date:	Mon, 14 Jan 2008 11:51:36 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Dave Young <hidave.darkstar@...il.com>,
	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


> 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.

johannes

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