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

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Message-Id: <1200306902.5887.39.camel@johannes.berg>
Date:	Mon, 14 Jan 2008 11:35:02 +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


> > 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.

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

johannes

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