linux-kernel - Re: 2.6.20-git13 kernel BUG at /mnt/md0/devel/linux-git/kernel/time/tick-sched.c:168

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Date:	Fri, 16 Feb 2007 22:22:19 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.20-git13 kernel BUG at
	/mnt/md0/devel/linux-git/kernel/time/tick-sched.c:168

On Fri, 2007-02-16 at 21:38 +0100, Michal Piotrowski wrote:
> Hi,
> 
> This looks like a tickless stuff

Yup.

> 0xc0139ea0 is in tick_nohz_stop_sched_tick (/mnt/md0/devel/linux-git/kernel/time/tick-sched.c:168).
> 163
> 164             if (need_resched())
> 165                     goto end;
> 166
> 167             cpu = smp_processor_id();
> 168             BUG_ON(local_softirq_pending());

Hmm, the BUG_ON is inside of an interrupt disabled region, so we should
have bailed out early in the need_resched() check above (because we are
in the idle task context according to the stack trace).

Is this reproducible ?

	tglx


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