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From: Rusty Russell <rusty@rustcorp.com.au>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	Ingo Molnar <mingo@elte.hu>,
	Manfred Spraul <manfred@colorfullife.com>,
	Peter Zijlstra <peterz@infradead.org>,
	cpufreq@vger.kernel.org
Subject: Re: circular locking dependency on shutdown
Date: Fri, 30 Jan 2009 15:13:35 +1030	[thread overview]
Message-ID: <200901301513.36002.rusty@rustcorp.com.au> (raw)
In-Reply-To: <1233255049.4067.12.camel@johannes.local>

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.

      parent reply	other threads:[~2009-01-30  4:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-29 18:50 circular locking dependency on shutdown Johannes Berg
2009-01-29 19:54 ` Johannes Berg
2009-01-29 20:27   ` Ingo Molnar
2009-01-30  4:43 ` Rusty Russell [this message]

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