[mythtv-users] mythbackend lockup/crash

[Anthony Giggins]

On 27 February 2017 at 13:02, Stephen Worthington <stephen_agent at jsw.gen.nz>
wrote:

> On Sun, 26 Feb 2017 19:27:36 -0600, you wrote:
>
> >On Sun, Feb 26, 2017 at 5:01 PM, Martin Gallant <martyg at goodbit.net>
> wrote:
> >
> >> Before you start pulling you hair out over the software, suggest you
> >> inspect your machines for plugged up fans and heatsinks.
> >>
> >> What you describe could be consistent with a thermal/overheating issue,
> >> especially if the system has been stable a long time.
> >>
> >> snip
> >>
> >
> >
> >I should have included more information but my backend is a KVM vm, the
> >linux host is fuly operational when mythbackend stops responding, thats
> the
> >best way to describe it.  Mythweb doesn't work and anything that tries to
> >connect to the backend times out.  The process is still running but it
> just
> >stops responding to anything.
> >
> >I created a cron script to check on connectivity to the backend every
> >minute and restart it if it finds it not responding.  I will probably also
> >create a cron to nightly restart mythbackend and that really will prolly
> >due it but never have had to do that in the past.
> >
> >For the most part it just works but something hangs it in an odd way.
>
> If it is only happening when you start LiveTV, then I think I get that
> too in 0.28-fixes.  It is quite reproducible for me - if I use LiveTV
> to manually test all of my tuners (3 x DVB-T, 2 x DVB-S2), then it is
> likely to lock up at some point.  Since I do not use LiveTV except for
> testing tuners, I have not bothered to try to track down the problem
> yet.
>
>
Check dmesg on both the KVM guest and the host, I've seen issues with kvm
before, especially under high load

ie.

BUG: soft lockup - CPU#2 stuck for 306s! [irqbalance:1438]


Cheers,


Anthony
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