linux-kernel - Re: 2.6.19.1-rt15: BUG in __tasklet

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Date:	Wed, 20 Dec 2006 22:19:11 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Robert Crocombe <rcrocomb@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.19.1-rt15: BUG in __tasklet_action at kernel/softirq.c:568

On Wed, 2006-12-20 at 20:50 +0100, Ingo Molnar wrote:
> * Robert Crocombe <rcrocomb@...il.com> wrote:
> 
> > On 12/19/06, Ingo Molnar <mingo@...e.hu> wrote:
> > >yeah. This is something that triggers very rarely on certain boxes. Not
> > >fixed yet, and it's been around for some time.
> > 
> > Is there anything you would like me to do to help diagnose this?
> 
> to figure out what the bug is :-/ Below is the tasklet redesign patch - 
> the bug must be in there somewhere.

> +static inline int tasklet_tryunlock(struct tasklet_struct *t)
> +{
> +	return cmpxchg(&t->state, TASKLET_STATEF_RUN, 0) == TASKLET_STATEF_RUN;
> +}
> +

This probably isn't it, but is cmpxchg available on all archs now?

-- Steve


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