linux-kernel - Re: 2.6.19-rc6 -- dm: possible recursive locking detected

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Message-ID: <20061117194303.GB4409@agk.surrey.redhat.com>
Date:	Fri, 17 Nov 2006 19:43:03 +0000
From:	Alasdair G Kergon <agk@...hat.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com
Subject: Re: 2.6.19-rc6 -- dm: possible recursive locking detected

On Fri, Nov 17, 2006 at 04:30:03PM +0100, Heiko Carstens wrote:
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.19-rc6-g1b9bb3c1 #28
> ---------------------------------------------
> kpartx/945 is trying to acquire lock:
>  (&md->io_lock){----}, at: [<00000000001f8faa>] dm_request+0x42/0x24c
> 
> but task is already holding lock:
>  (&md->io_lock){----}, at: [<00000000001f8faa>] dm_request+0x42/0x24c
 
Known problem - nobody's written a patch to fix it yet to my knowledge,
but I don't recall any reports of real world lock-ups related to this - just
several reports of the debug warning messages:-)

Simply ignore the message for now - or submit a patch that fixes the
underlying problem:-)

Alasdair
-- 
agk@...hat.com
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