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

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Message-ID: <20061226234045.GC6003@elte.hu>
Date:	Wed, 27 Dec 2006 00:40:45 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
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


* Steven Rostedt <rostedt@...dmis.org> wrote:

> 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?

yeah, it's probably not related, i saw these failures on plain i686 too, 
which definitely has cmpxchg support. The failures i saw happened on a 
hyperthreading CPU, so i guess it must be some sort of narrow race.

	Ingo
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