[nmglug] Freezing

[Leopoldo Macias]

Brian,

Sounds like a plan. Until we meet, try to jot down when (and if) you 
laptop hangs again. It will help in troubleshooting if it turns out to 
be a chronic issue and if there's a pattern to when the laptop hangs (it 
could lead us to cron jobs if it's a consistent pattern). If there's not 
a pattern, then we can look at hardware logs.


On 6/10/20 9:37 AM, Brian O'Keefe wrote:
>
> Thanks for the info Leopoldo. I ran the command and there is a lot of 
> info! I didn't update swap but I did notice in the log that swap was 
> increased to the 2+GB so that doesn't seem an issue. I did find many 
> lines errors but they seem ubiquitous as the machine powers up. I only 
> found one line in yesterday's log that was a kill command. Perhaps 
> that's my doing a hard shutdown.
>
> Anyway, too much in the logs for me. Perhaps when we can meet 
> physically again I can get some help looking at the logs and figure it 
> out. Fortunately I pretty much stick to simple apps these days (of 
> retirement) and so I don't get in trouble when the machine hangs.
>
> Muchas Gracias
>
> Brian
>
> On 6/7/20 11:49 PM, Leopoldo Macias wrote:
>>
>> I agree with Akkana.. look for the cause,
>>
>> If your system froze, try running the journalctl command (there's 
>> lots of data in that). You can filter the data in many ways so as not 
>> to get overwhelmed. For example:
>>
>> To view the kernel logs (which might have clues to a crash or hang)
>> journalctl -rk
>>
>> the (-r) will print the log in reverse order (meaning newest logs 
>> show up first)
>>
>> the (-k) will only show logs for the kernel (you can choose many 
>> different logs to display with other options)
>>
>> You can scroll down through the logs or type the colon (shift+;) and 
>> q to quit the log.
>>
>> Here is a link for helpful journalctl commands:
>>
>> https://www.thegeekdiary.com/6-useful-journalctl-command-examples-in-centos-rhel-7-cheat-sheet/
>>
>> I tried it on my ubuntu20.04 and I did not have to use sudo to run 
>> the 'journalctl' commands.
>>
>> Usually if a process hung it will be recorded in the kernel logs and 
>> that give a path to follow. Also, has this happened multiple times 
>> prior to the swap update? or did occur only once?
>>
>>
>>
>> On 6/7/20 11:29 AM, Brian O'Keefe wrote:
>>>
>>> Thanks Akkana
>>>
>>> Yeah, can't check much when frozen. I've looked at dmesg but too 
>>> much in there that I don't understand. I'll come running for help if 
>>> this gets worse. It's usually only every couple of days. I do put 
>>> the machine to sleep a lot. Maybe I need to shut down daily or some 
>>> such,
>>>
>>> Best
>>>
>>> Brian
>>>
>>> On 6/7/20 11:07 AM, Akkana Peck wrote:
>>>> Brian O'Keefe writes:
>>>>>     I am loathe to increase the swap memory when it doesn't appear to be a
>>>>>     problem according to System Monitor.
>>>> This. I've seen a lot of discussion about swap, but if there was any
>>>> evidence that swap was the problem, I missed it. If adding swap is
>>>> going to be this hard, maybe put the effort instead into diagnosing
>>>> why the system is freezing?
>>>>
>>>> For instance, do you know if it's X or the kernel that's freezing?
>>>> It would be interesting to try to ssh in from another machine,
>>>> to see if maybe the machine is up but X is locked.
>>>>
>>>> Diagnosing a freeze isn't all that easy, because of course if the
>>>> kernel is hung, then the system has no way to note what went wrong.
>>>> But sometimes you can find out what was happening just before it
>>>> froze. Here's a Google search that gives some starting points:
>>>>
>>>> https://www.google.com/search?client=ubuntu&channel=fs&q=diagnose+why+linux+freezing&ie=utf-8&oe=utf-8
>>>>
>>>>          ...Akkana
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>>>>
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>>
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