linux-kernel - Re: [2.6.33-rc5] Weird deadlock when shutting down

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Date:	Fri, 26 Mar 2010 12:22:02 +0000
From:	David Howells <dhowells@...hat.com>
To:	=?UTF-8?Q?Am=C3=A9rico_Wang?= 
	<xiyou.wangcong@...il.com>, torvalds@...l.org,
	akpm@...ux-foundation.org
Cc:	dhowells@...hat.com,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: [2.6.33-rc5] Weird deadlock when shutting down

Américo Wang <xiyou.wangcong@...il.com> wrote:

> > =======================================================
> > [ INFO: possible circular locking dependency detected ]
> > 2.6.34-rc2-cachefs #115
> > -------------------------------------------------------
> > halt/2291 is trying to acquire lock:
> >  (s_active#31){++++.+}, at: [<ffffffff81104950>] sysfs_addrm_finish+0x31/0x5a
> >
> > but task is already holding lock:
> >  (&per_cpu(cpu_policy_rwsem, cpu)){+++++.}, at: [<ffffffff812a3a92>] lock_policy_rwsem_write+0x4a/0x7b
> >
> > which lock already depends on the new lock.
> >
> 
> 
> I already send a patch for this:
> 
> https://patchwork.kernel.org/patch/83558/
> 
> It is still in -mm tree, I think.

Tested-by: David Howells <dhowells@...hat.com>
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