linux-kernel - Re: circular locking dependency on shutdown

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Date:	Fri, 30 Jan 2009 15:13:35 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Ingo Molnar <mingo@...e.hu>,
	Manfred Spraul <manfred@...orfullife.com>,
	Peter Zijlstra <peterz@...radead.org>, cpufreq@...r.kernel.org
Subject: Re: circular locking dependency on shutdown

On Friday 30 January 2009 05:20:49 Johannes Berg wrote:
> Hi,
> 
> Every time I shut down my machine with a 2.6.29-rc2 kernel, I get a
> lockdep report that scrolls off.
...
> halt is trying to acquire lock
> 	(&per_cpu(cpu_policy_rwsem, cpu)){---}
> 
> but task is already holding lock
> 	(&cpu_hotplug.lock){--..}

Hi Johannes,

   This looks much like the work_on_cpu()-getting-hotplug-lock problem which caused us to stop work_on_cpu doing that.  -rc3 has that fix; any chance of a re-test?

Thanks,
Rusty.
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