linux-kernel - Re: Strange soft lockup detected message (looks like spin

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Message-ID: <20070504153438.GE24769@slug>
Date:	Fri, 4 May 2007 17:34:38 +0200
From:	Frederik Deweerdt <deweerdt@...e.fr>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Strange soft lockup detected message (looks like spin_lock bug in pcnet32)

On Fri, May 04, 2007 at 11:19:34AM -0400, Lennart Sorensen wrote:
> On Fri, May 04, 2007 at 04:33:26PM +0200, Frederik Deweerdt wrote:
> > On Fri, May 04, 2007 at 10:10:24AM -0400, Lennart Sorensen wrote:
> > > On Thu, May 03, 2007 at 04:31:43PM -0400, Lennart Sorensen wrote:
> > [...]
> > > Should line 2563 be a spin_lock_irqsave instead along with the
> > > appropriate unluck later?
> > IIRC, when you enable lockdep, it will complain about spinlocks used in
> > an invalid context.
> 
> What is lockdep and how do I enable it?
For the "what" part, see Documentation/lockdep-design.txt. You'll enable
it by with SPINLOCK_DEBUG, indeed.
> 
> I enabled SPINLOCK_DEBUG and am going to try that kernel now (except it
> hit the bug before I could even log in and install the kernel this time,
> so another reboot first).
> 
> --
> Len Sorensen
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