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Subject: Re: 2.6.24-rc7 lockdep warning when poweroff
From: Johannes Berg <johannes@sipsolutions.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Dave Young <hidave.darkstar@gmail.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>
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	 <1200302644.7415.6.camel@twins>
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Date: Mon, 14 Jan 2008 11:35:02 +0100
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> > When I "halt -p", lockdep warnings triggered as following (hand copy):
> >=20
> > WARNING : at kernel/lockdep.c: 700 lookup_lock_class()
> >=20
> > <snip>
> > lock_acquire
> > cleanup_workqueue_thread
> > workqueue_cpu_callback
> > notifier_call_chain
> > __raw_notifier_call_chain
> > raw_notifier_call_chain
> > __cpu_down
> > disable_nonboot_cpus
> > kernel_power_off
> > sys_reboot
> > <snip>
>=20
> My first guess would be a __create_workqueue_key() where a key is
> re-used with a different workqueue name.

Hm, can you elaborate how you got there from the trace above? I don't
think I'm following.

johannes

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