What's causing my PC to freeze up?

[jglen490]

I had similar experience a while back. I found that I had selected "Suspend" in the Power Management -> Energy Saving system setting. When I turned that off, my laptop's awake experience was uneventful. I just let the time out settings or laptop lid closing do what they do. I know you aren't talking about a laptop. Sometimes power, timeout, and sleep settings can conflict

[Qqmike]

Memtest86+
I ran it for almost 2 hours, two full passes (10 tests each pass).
No errors.

S-K:

You had three user applications open again - the Firefox Snap, Dolphin and LibreOffice - when the freeze-up occured?

-- Yep.

jglen: Thanks. On the PC, "Suspend" is not selected. But I'll keep the idea in mind (about possible conflicting settings).

[Schwarzer Kater]

If you cannot find anything in the log files (or jglen490's suggestions lead to nothing), I have two more thoughts:
- try the 5.19 kernel
- don't use (the Firefox) Snap
and see if these make any difference…

And df -hT does show enough free space on your partitions, doesn't it?

[Qqmike]

Oh, yes, I am not using much space here (deleting the tmpfs, all at 1%):

~$ df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda2 ext4 46G 13G 31G 30% /
/dev/sda3 ext4 183G 8.8G 165G 6% /home
/dev/sda1 vfat 197M 6.1M 191M 4% /boot/efi

It happens quite infrequently, so re-booting is not much of a problem. And I can always keep trying to see something in the log files or elsewhere.
You know, the guys in another thread were talking about Firefox snap doing this ... so maybe it is that, although I thought updates were to fix that, I can't recall.
I use Firefox snap because it's there, provided, convenient, I don't have to do anything special to install/maintain. Did a lot of installing & maintaining in the past, just another PITA (on top of maintaining the cell phones, tablets, laptop, dishwasher & appliances, the house, the car, the health ... )

I was, though, a little concerned about a possible memory module issue. Usually a main culprit in freeze-ups. I've got two 16 GB Crucial memory modules, and it's a good brand. Luckily, memtest+ isn't seeing the usual, 'most likely' problems with it, after two completed full passes.

Thanks for your time and ideas. I'll keep posting anything new that comes up.

[Snowhog]

IF firefox is the cause of your freezes (Why might that be? Firefox has had, nearly forever, and I believe still has, a memory leakage problem that has been complained about, again, nearly forever), launch Konsole and make it always visible and type top and press Enter.

Then press the letter o and type: COMMAND=firefox

This will limit the output of top to just the running instance of firefox. You can observe how it is utilizing memory, and you can observe how overall system memory is being used.

[Qqmike]

Thanks, Snowhog, will try that.