Subject: Re: 2.6.21-rc1: known regressions (v2) (part 2)
From: Thomas Gleixner <tglx@linutronix.de>
To: Adrian Bunk <bunk@stusta.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       "David P. Reed" <dpreed@reed.com>, Ayaz Abdulla <aabdulla@nvidia.com>,
       jgarzik@pobox.com, netdev@vger.kernel.org,
       Albert Hopkins <kernel@marduk.letterboxes.org>,
       Bob Tracy <rct@gherkin.frus.com>, Mark Brown <broonie@sirena.org.uk>,
       "Michael S. Tsirkin" <mst@mellanox.co.il>, Ingo Molnar <mingo@elte.hu>,
       Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
In-Reply-To: <20070226220521.GB29575@stusta.de>
References: <Pine.LNX.4.64.0702202043280.4043@woody.linux-foundation.org>
	 <20070226220521.GB29575@stusta.de>
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Date: Tue, 27 Feb 2007 09:21:31 +0100
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Adrian,

On Mon, 2007-02-26 at 23:05 +0100, Adrian Bunk wrote:
> Subject    : kernel BUG at kernel/time/tick-sched.c:168  (CONFIG_NO_HZ)
> References : http://lkml.org/lkml/2007/2/16/346
> Submitter  : Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
> Handled-By : Thomas Gleixner <tglx@linutronix.de>
> Status     : problem is being debugged

The BUG_ON() was replaced by a warning printk(). The BUG_ON() exposed a
problem with the SMT scheduler. See below.

> Subject    : BUG: soft lockup detected on CPU#0
>              NOHZ: local_softirq_pending 20  (SMT scheduler)
> References : http://lkml.org/lkml/2007/2/20/257
> Submitter  : Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
> Handled-By : Thomas Gleixner <tglx@linutronix.de>
>              Ingo Molnar <mingo@elte.hu>
> Status     : problem is being debugged

Patch available, not confirmed yet.

	tglx


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