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From: Johannes Berg <johannes@sipsolutions.net>
To: Linux Kernel list <linux-kernel@vger.kernel.org>
Cc: 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: circular locking dependency on shutdown
Date: Thu, 29 Jan 2009 19:50:49 +0100	[thread overview]
Message-ID: <1233255049.4067.12.camel@johannes.local> (raw)

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Hi,

Every time I shut down my machine with a 2.6.29-rc2 kernel, I get a
lockdep report that scrolls off. I tried capturing it on video, the
relevant frames are here:
http://johannes.sipsolutions.net/files/shutdown-lockdep-images.tar.bz2

Some info I transscribed:

halt is trying to acquire lock
	(&per_cpu(cpu_policy_rwsem, cpu)){---}

but task is already holding lock
	(&cpu_hotplug.lock){--..}

which already yadda yadda

lock chain:
#1	(&cpu_hotplug.lock){--..}
	...
	get_online_cpus
#0	(&per_cpu(cpu_policy_rwsem, cpu))
	...
	disable_nonboot_cpus

stacktrace:
	down_write
	lock_policy_rwsem_write
	cpufreq_cpu_callback
	notifier_call_chain
	disable_nonboot_cpus
	kernel_power_off
	...


johannes

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             reply	other threads:[~2009-01-29 18:51 UTC|newest]

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

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