linux-kernel - Re: pcspkr lockdep trace.

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Message-ID: <20080517191827.GB8140@cs181133002.pp.htv.fi>
Date:	Sat, 17 May 2008 22:18:27 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Dave Jones <davej@...emonkey.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	stsp@...rs.sourceforge.net
Subject: Re: pcspkr lockdep trace.

On Sat, May 17, 2008 at 01:26:12PM -0400, Dave Jones wrote:
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.26-0.13.rc2.git5.fc10.x86_64 #1
> -------------------------------------------------------
> ksoftirqd/0/4 is trying to acquire lock:
>  (&pcsp_chip.substream_lock){++..}, at: [<ffffffffa0265333>] pcsp_do_timer+0x5a/0x2b3 [snd_pcsp]
> 
> but task is already holding lock:
>  (&cpu_base->lock){++..}, at: [<ffffffff8104e0a8>] hrtimer_interrupt+0x79/0x14f
>...

Known bug:
  http://bugzilla.kernel.org/show_bug.cgi?id=10701

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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