[mythtv-users] a new type of error

[Jim Abernathy]

On 03/09/2018 06:52 AM, Michael T. Dean wrote:
> On 03/08/2018 06:31 PM, James Abernathy 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]
>>
>> 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??
>
> Power issue?  Unless it's a bug in a kernel or a misconfigured virtual 
> machine, it could be caused by anything from a failing CPU (not too 
> common) to a failing PSU (pretty common) or a failing motherboard 
> (generally having issues delivering power/providing a stable vcore).

My backend is connected to a APC UPS, but the power hasn't qlitched here 
for months.  In my experience a PSU will cause issues that bring down a 
system or cause it to lock up.  If I don't go looking for this problem, 
it keeps running mythbackend and records programs

Jim A

>
> Mike
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