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

From: Thomas Gleixner <[email-masked]>
Date: Tue, 27 Feb 2007 09:21:31 +0100

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 <[email-masked]>
> Handled-By : Thomas Gleixner <[email-masked]>
> 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 <[email-masked]>
> Handled-By : Thomas Gleixner <[email-masked]>
>              Ingo Molnar <[email-masked]>
> Status     : problem is being debugged

Patch available, not confirmed yet.

	tglx