Trying to isolate random freezes in Ubuntu 20.04

Parker Davis

11/28/22, 9:53 PM

I'm new to Ubuntu/Linux but an experienced if not expert Windows user. I've set up Ubuntu 20.04 on an older PC with an Asus a8N32-SLI Deluxe (nvidia nforce4 chipset) motherboard and a Radeon HD 7850 as a retro gaming machine for my kids. I have a triple boot with XP, Vista and Ubuntu all loading perfectly. Ubuntu runs fine for a while but crashes periodically with no specific pattern (sometimes while browsing in Chrome or Firefox, typing in search box, starting to install an app, or just idling). I'm using the stock Radeon driver because that's the only thing that supports the old gpu on 20.04. This PC has only 4 GB RAM, but I'm pretty sure it's not running out of memory because it didn't crash when I deliberately loaded the memory running lots of apps, including Chrome and Firefox with multiple tabs, and the swapfile seemed to work fine.

I found some ACPI errors in the logs, e.g.: PI BIOS Error (bug): AE_AML_PACKAGE_LIMIT, Index (0x0FFFFFFFF) is beyond end of object (length 0x5) (20200528/exoparg2-393)

One article suggested disabling APIC in the bios, but I can't or my Windows won't boot, so I disabled APIC by adding "noapic" to the kernel boot options.

I also find the following highlighted in red in kern.log when it froze: \00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00Jul 28 13:31:59 Minas-Morgul kernel: [ 0.000000] Linux version 5.8.0-63-generic (buildd@lgw01-amd64-035) (gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #71~20.04.1-Ubuntu SMP Thu Jul 15 17:46:08 UTC 2021 (Ubuntu 5.8.0-63.71~20.04.1-generic 5.8.18)

Jul 28 13:31:59 Minas-Morgul kernel: [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.8.0-63-generic root=UUID=3de49449-3f64-4c79-9cc0-4d6572ade883 ro quiet splash crashkernel=512M-:192M vt.handoff=7

Can anyone suggest where to look in the logs to identify and fix this issue?

Thanks! Parker

138

1 + 0

acpi

kernel

freeze

logs

crash

Score:0

Ubuntu

waltinator

11/29/22, 3:26 AM

After a "sudden shutdown", aka "system crash", and reboot, the terminal command sudo journalctl -b -1 -e will show you the end of the previous boot's log's. If there is no hint there, suspect power/ overheating.

Read man journalctl to see how to extract information from the logs.

You can find how I make use of journalctl easier at https://askubuntu.com/users/25618/waltinator.

0 + 1

Parker Davis

11/29/22, 5:35 PM

Thanks so much, I'll give that a try and get back with an update!

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Trying to isolate random freezes in Ubuntu 20.04

TH: Trying to isolate random freezes in Ubuntu 20.04

RO: Trying to isolate random freezes in Ubuntu 20.04

RU: Trying to isolate random freezes in Ubuntu 20.04

VI: Trying to isolate random freezes in Ubuntu 20.04

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