linux-kernel - Re: [linux-next] possible circular locking dependency for cryptsetup

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Message-ID: <20081107124023.GA12021@gondor.apana.org.au>
Date:	Fri, 7 Nov 2008 20:40:23 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Markus Dahms <mad@...omagically.de>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-next] possible circular locking dependency for
	cryptsetup

On Fri, Nov 07, 2008 at 08:37:50PM +1100, Stephen Rothwell wrote:
>
> > =======================================================
> > [ INFO: possible circular locking dependency detected ]
> > 2.6.28-rc3-next-20081106-mad-1 #2
> > -------------------------------------------------------
> > cryptsetup/2554 is trying to acquire lock:
> >  (&cpu_hotplug.lock){--..}, at: [<c012cd32>] get_online_cpus+0x22/0x40
> > 
> > but task is already holding lock:
> >  (&mm->mmap_sem){----}, at: [<c018b98e>] sys_mlockall+0x5e/0xd0

I don't see anything in the back-trace that's crypto related
or even dm related.  Therefore I suspect the problem is in core
sysfs, mm or CPU hot plugging.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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