linux-kernel - Re: 2.6.33: ftrace triggers soft lockup

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Message-ID: <1268669763.4471.810.camel@gandalf.stny.rr.com>
Date:	Mon, 15 Mar 2010 12:16:03 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Li Zefan <lizf@...fujitsu.com>
Subject: Re: 2.6.33: ftrace triggers soft lockup

On Mon, 2010-03-15 at 10:39 -0400, Steven Rostedt wrote:

> > As I said in the offline mail, this warning is caused by global trace_clock,
> > and I sent a fix sometime ago:
> > 
> > http://lkml.org/lkml/2009/12/21/4
> 
> Ah, I was waiting for a final Acked-by: from Peter Zijlstra.
> 
> Peter,
> 
> Should I pull in that patch? I don't see anything wrong with converting
> a raw_local_irq_save() to a local_irq_save() in the tracing code. I'll
> apply it locally and see if it fixes the warn on that I see.

Peter,

I ran the stress test for an hour without any lockdep warnings with Li's
patch. Normally it would trigger in a second. Can I get your acked-by?

Thanks,

-- Steve


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