linux-kernel - Re: 2.6.20-git15 BUG: soft lockup detected on CPU#0!

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Date:	Fri, 23 Feb 2007 08:32:03 +0100
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Michal Piotrowski <michal.k.k.piotrowski@...glemail.com>,
	tglx@...utronix.de, LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.20-git15 BUG: soft lockup detected on CPU#0! - timers?

On Fri, 2007-02-23 at 07:08 +0100, Ingo Molnar wrote:

> Index: linux/kernel/sched.c
> ===================================================================
> --- linux.orig/kernel/sched.c
> +++ linux/kernel/sched.c
> @@ -4689,6 +4689,7 @@ int __sched cond_resched_softirq(void)
>  	BUG_ON(!in_softirq());
>  
>  	if (need_resched() && system_state == SYSTEM_RUNNING) {
> +		WARN_ON(current->state != TASK_RUNNING);
>  		raw_local_irq_disable();
>  		_local_bh_enable();
>  		raw_local_irq_enable();

I'm getting NOHZ: local_softirq_pending 02 or 10 every few seconds if
the box is doing anything, and the WARN_ON() has yet to trigger.

	-Mike

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