Re: PPro arch_cpu_idle: NMI watchdog: Watchdog detected hard LOCKUP on cpu 1

Thomas Gleixner
2017-03-02T01:35:21Z

On Thu, 2 Mar 2017, Meelis Roos wrote:

> > > This is on my trusty IBM PC365, dual Pentium Pro. 4.10 worked fine,
> > > 4.10.0-09686-g9e314890292c and 4.10.0-10770-g2d6be4abf514 exhibit a
> > > problem. Ocassionally NMI watchdog kicks in and discovers one of the
> > > CPUs in LOCKUP. The system keeps running fine. The first lockup was
> > > different, all the others were from arch_cpu_idle. Sometime ecey couple
> > > of seconds (after some activity), sometimes nothing for a long time
> > > (idle, no SSH logins).
> >
> > The only watchdog related patch which hit after 4.10 is:
> >
> > 8dcde9def5a1 kernel/watchdog.c: do not hardcode CPU 0 as the initial thread
> >
> > Can you try to revert that for a start? I'm not seeing why it should be the
> > culprit from a quick glance, but ...
>
> Reverting this patch does not help.

I did not expect that, but excluding it was a valid shot in the
dark. Thanmks for trying.

To be honest, I have no idea what causes that at the moment, but I will
come back to you tomorrow after thinking it through (with brain awake) how
to debug this.

Thanks,

tglx