linux-kernel - Re: [BUG RT] 2.6.25.8-rt7 on 8-way

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Date:	Mon, 30 Jun 2008 08:37:25 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sven-Thorsten Dietrich <sven@...bigcorporation.com>
cc:	Noah Watkins <noahwatkins@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: [BUG RT] 2.6.25.8-rt7 on 8-way


On Sun, 29 Jun 2008, Sven-Thorsten Dietrich wrote:

>
> On Sun, 2008-06-29 at 16:32 -0500, Noah Watkins wrote:
> > My kernel is very, very noisy with the following bug:
> >
> > - Full dmesg below
> > - Please CC me
> >
>
> I found this as well (adding Paul).
>
> If you disable CONFIG_PREEMPT_RCU_BOOST, does it go away?
>

Turning off CONFIG_RCU_TRACE will also make it go away. The bug is that
the tracing of the RCU boost code uses smp_processor_id while the RCU
boost code is not in an atomic section.

Paul has a fix for this already, and will be out in the next releases.

-- Steve
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