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

[Michal Piotrowski]

On 16/02/07, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> 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 ?

Yes.

>         tglx

Regards,
Michal

--
Michal K. K. Piotrowski
LTG - Linux Testers Group (PL)
(http://www.stardust.webpages.pl/ltg/)
LTG - Linux Testers Group (EN)
(http://www.stardust.webpages.pl/linux_testers_group_en/)
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