On Thu, May 18, 2017 at 1:04 PM, Pete Biggs <pete@xxxxxxxxxxxx> wrote:
>
>>
>> kernel: BUG: soft lockup - CPU#5 stuck for 67s! [khungtaskd]
>> kernel: BUG: soft lockup - CPU#7 stuck for 67s! [khugepaged]
>>
>> These messages started appearing today around 7 AM, which is when
>> users started reporting the slowdown. They are still occurring
>> periodically and the system is still slow. Are these messages caused
>> by the slowdown or are they the reason for it? Are they useful in
>> tracking down the problem?
>
> They are what is causing it to appear to run slow.
>
> The soft lockup is when a CPU is spending a lot of time in kernel mode.
> The cause can be a number of things, including overloading or a bug in
> the kernel - or sometimes a hardware issue.
>
> Are you seeing any other possibly hardware related errors in the logs?
>
> Do you have the 'sensors' package installed and configured - is
> everything OK? (An overclocked CPU or a low voltage/bad PSU can cause
> this sort of thing.)
Sorry for the delay in responding, but that system was down until
today for other reasons. Indeed it was a bad power supply that was
making it run slow. Never would have guessed that. Thanks so much for
the suggestion. Had it replaced and it's running fine now.
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