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

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Message-Id: <1200302644.7415.6.camel@twins>
Date:	Mon, 14 Jan 2008 10:24:04 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: 2.6.24-rc7 lockdep warning when poweroff


On Mon, 2008-01-14 at 17:04 +0800, Dave Young wrote:
> Hi,
> 
> When I "halt -p", lockdep warnings triggered as following (hand copy):
> 
> WARNING : at kernel/lockdep.c: 700 lookup_lock_class()
> 
> <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>

My first guess would be a __create_workqueue_key() where a key is
re-used with a different workqueue name.

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