linux-kernel - Re: 2.6.21-rc1: known regressions (v2) (part 2)

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Message-Id: <1172564491.3709.5.camel@chaos>
Date:	Tue, 27 Feb 2007 09:21:31 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"David P. Reed" <dpreed@...d.com>,
	Ayaz Abdulla <aabdulla@...dia.com>, jgarzik@...ox.com,
	netdev@...r.kernel.org,
	Albert Hopkins <kernel@...duk.letterboxes.org>,
	Bob Tracy <rct@...rkin.frus.com>,
	Mark Brown <broonie@...ena.org.uk>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Ingo Molnar <mingo@...e.hu>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: 2.6.21-rc1: known regressions (v2) (part 2)

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@...il.com>
> Handled-By : Thomas Gleixner <tglx@...utronix.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@...il.com>
> Handled-By : Thomas Gleixner <tglx@...utronix.de>
>              Ingo Molnar <mingo@...e.hu>
> Status     : problem is being debugged

Patch available, not confirmed yet.

	tglx


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