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Date: Mon, 14 Aug 2006 14:46:52 -0700
From: Andrew Morton <akpm@osdl.org>
To: Dave Jones <davej@redhat.com>
Cc: Ben Buxton <kernel@bb.cactii.net>,
       Maciej Rutecki <maciej.rutecki@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.18-rc4-mm1
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On Mon, 14 Aug 2006 16:20:04 -0400
Dave Jones <davej@redhat.com> wrote:

> On Mon, Aug 14, 2006 at 01:55:56PM +0200, Ben Buxton wrote:
>  
>  > > > Also, whenever I echo anything to "scaling_governor", I get the
>  > > > following kernel message:
>  > > > 
>  > > > [  734.156000] BUG: warning at kernel/cpu.c:38/lock_cpu_hotplug()
>  > > > [  734.156000]  [<c013c3ec>] lock_cpu_hotplug+0x7c/0x90
>  > > > [  734.156000]  [<c01327f4>] __create_workqueue+0x44/0x140
>  > > > [  734.156000]  [<c02dcf7b>] mutex_lock+0xb/0x20
>  > > > [  734.156000]  [<e01f2665>] cpufreq_governor_dbs+0x2b5/0x310 [cpufreq_ondemand]
>  > > 
>  > > This makes no sense at all, because in -mm __create_workqueue doesn't
>  > > call lock_cpu_hotplug().
>  > > 
>  > > Are you sure this was from a tree with -mm1 applied ?
>  > 
>  > Definitely 2.6.18-rc4-mm1, and I've done a clean rebuild + removal of
>  > all modules under /lib/modules beforehand.
> 
> It's a real mystery.  Andrew ?
> 

I'm suspecting it's just stack gunk.  If Ben could send some more such
traces that'd clear things up.  Also, turning on CONFIG_UNWIND_INFO,
CONFIG_STACK_UNWIND and perhaps CONFIG_FRAME_POINTER might give us a
cleaner backtrace.

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