[mythtv-users] a new type of error

[Greg Oliver]

On Thu, Mar 8, 2018 at 5:31 PM, James Abernathy <jfabernathy at gmail.com>
wrote:

> I’ve setup my mythtv backend to daily optimize and backup the database.  I
> have it email me with the results.  So when I don’t get the 2 emails at
> 7:35am each day, I go looking for problems. The system still records
> problems and the frontends work for viewing.
>
> What I’ve seen lately is I can’t ssh or login at the PC console of the
> backend, and I get errors on the console like:
> Mar  7 12:11:47 mythbuntu kernel: [317584.873671] NMI watchdog: BUG: soft
> lockup - CPU#4 stuck for 22s! [TFWWrite:25774]
> Mar  7 12:12:15 mythbuntu kernel: [317612.872998] NMI watchdog: BUG: soft
> lockup - CPU#4 stuck for 23s! [TFWWrite:25774]
> Mar  7 12:12:55 mythbuntu kernel: [317652.872033] NMI watchdog: BUG: soft
> lockup - CPU#4 stuck for 23s! [TFWWrite:25774]
> Mar  7 12:13:23 mythbuntu kernel: [317680.871359] NMI watchdog: BUG: soft
> lockup - CPU#4 stuck for 22s! [TFWWrite:25774]
>
>

​90+ % of the time, these errors are hardware related.  Looks like you may
have added too many peripherals to the power supply in the system..?
Today, they add so many huge capacitors on the motherboards to assure you
get "optimal and clean" power to the CPUs, they can often compensate for
surges when needed, but it ends up sometimes doing this exact thing
described and failing at some point.

I had a system with a 450 "green" PSU that would undeliver hugely at times
and I had to put a clamp meter on the connectors to figure out it was not
delivering close to what it advertised.



> The Host name is mythbuntu.  It’s a Ubuntu 16.04 system
>
> Once I reboot, the system works fine and I get my optimize emails after a
> short time.  But a day or so later I notice this problem again.  I have not
> changed anything, but I have done some updating using:  apt update and apt
> upgrade.
>
> Any ideas??
>
> Jim Abernathy
> jfabernathy at gmail.com
>
>
>
>
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