From: Ming Lei <tom.leiming@gmail.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Oleg Nesterov <oleg@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Zdenek Kabelac <zdenek.kabelac@gmail.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: INFO: possible circular locking dependency at cleanup_workqueue_thread
Date: Wed, 20 May 2009 15:09:20 +0800 [thread overview]
Message-ID: <d82e647a0905200009pc894d4yed0f81c83443a0ee@mail.gmail.com> (raw)
In-Reply-To: <1242802064.31350.12.camel@johannes.local>
2009/5/20 Johannes Berg <johannes@sipsolutions.net>:
> On Wed, 2009-05-20 at 11:36 +0800, Ming Lei wrote:
>
>> > Anyway, you can have a deadlock like this:
>> >
>> > CPU 3 CPU 2 CPU 1
>> > suspend/hibernate
>> > something:
>> > rtnl_lock() device_pm_lock()
>> > -> mutex_lock(&dpm_list_mtx)
>> >
>> > mutex_lock(&dpm_list_mtx)
>>
>> Would you give a explaination why mutex_lock(&dpm_list_mtx) runs in CPU2
>> and depends on rtnl_lock?
>
> Why not? Something is registering a hotplugged netdev.
I see. I just feel a bit curious how lockdep may build the dependency
of dpm_list_mtx on rtnl_lock, and it is certainly related with
lockdep internal.
--
Lei Ming
next prev parent reply other threads:[~2009-05-20 7:09 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-12 7:59 INFO: possible circular locking dependency at cleanup_workqueue_thread Zdenek Kabelac
2009-05-17 7:18 ` Ingo Molnar
2009-05-17 10:42 ` Ming Lei
2009-05-17 11:18 ` Johannes Berg
2009-05-17 13:10 ` Ingo Molnar
2009-05-18 19:47 ` Oleg Nesterov
2009-05-18 20:00 ` Peter Zijlstra
2009-05-18 20:16 ` Oleg Nesterov
2009-05-18 20:40 ` Peter Zijlstra
2009-05-18 22:14 ` Oleg Nesterov
2009-05-19 9:13 ` Peter Zijlstra
2009-05-19 10:49 ` Peter Zijlstra
2009-05-19 14:53 ` Oleg Nesterov
2009-05-19 8:51 ` Johannes Berg
2009-05-19 12:00 ` Oleg Nesterov
2009-05-19 15:33 ` Johannes Berg
2009-05-19 16:09 ` Oleg Nesterov
2009-05-19 16:27 ` Johannes Berg
2009-05-19 18:51 ` Oleg Nesterov
2009-05-22 10:46 ` Johannes Berg
2009-05-22 22:23 ` Rafael J. Wysocki
2009-05-23 8:21 ` Johannes Berg
2009-05-23 23:20 ` Rafael J. Wysocki
2009-05-24 3:29 ` Ming Lei
2009-05-24 11:09 ` Rafael J. Wysocki
2009-05-24 12:48 ` Ming Lei
2009-05-24 19:09 ` Rafael J. Wysocki
2009-05-24 14:30 ` Alan Stern
2009-05-24 19:06 ` Rafael J. Wysocki
2009-05-20 3:36 ` Ming Lei
2009-05-20 6:47 ` Johannes Berg
2009-05-20 7:09 ` Ming Lei [this message]
2009-05-20 7:12 ` Johannes Berg
2009-05-20 8:21 ` Ming Lei
2009-05-20 8:45 ` Johannes Berg
2009-05-22 8:03 ` Ming Lei
2009-05-22 8:11 ` Johannes Berg
2009-05-20 12:18 ` Peter Zijlstra
2009-05-20 13:18 ` Oleg Nesterov
2009-05-20 13:44 ` Peter Zijlstra
2009-05-20 13:55 ` Oleg Nesterov
2009-05-20 14:12 ` Peter Zijlstra
2009-05-24 18:58 ` Peter Zijlstra
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