[nmglug] Freezing

Brian O'Keefe okeefe at cybermesa.com
Wed Jun 10 08:37:42 PDT 2020

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


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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