CPU freezes and system reboots

[Manu]

CPU freezes and system reboots due to "zram (lzo): Decompression failed! err=-22, page=XXXXX" after upgrade to linux-image-5.4.0-51-generic.

Previous version, linux-image-5.4.0-48-generic, works without problems.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.4.0-51-generic (not installed)
ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
Date: Fri Oct 16 18:06:11 2020
InstallationDate: Installed on 2016-01-25 (1726 days ago)
InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed-hwe-5.4
Summary: CPU freezes and system reboots due to "zram (lzo): Decompression failed! err=-22, page=XXXXX" after upgrade to linux-image-5.4.0-51-generic - previous version linux-image-5.4.0-48-generic works.
UpgradeStatus: Upgraded to bionic on 2019-02-23 (600 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Michele Primavera (michyprima)]

I can confirm one of my VPS with linux-image-5.4.0-51-generic kept hanging, reverting back to -48 fixed the issue.

The issue seems to happen at random. At boot, right after boot, after 5 minutes from boot... but it always crashes sooner or later.

Sadly I was not able to get a log out of the crash.

[Manu (maxnu00)]

This issue seems also affect to Ubuntu 20.04 installer (ubuntu-20.04.1-desktop-amd64.iso). When enter in try mode, system freezes randomly.

[Sylvain Falardeau (sylvainf)]

Same problem for me on Ubuntu 20.04.1 with kernel linux-image-5.4.0-54-generic. I will try to
swapoff -a for now to see if it mitigate the problem. I gave the VM 2 more gigabytes of RAM
to reduce the need for swapping.

[H.P.J. Groeneweg (groenewe)]

Not sure if it helps, but I have a hunch this might have to do something with the CPU on which the kernel is running (CPU bugfixes maybe? spectre/meltdown and newer problems) In my case, I've not seen this problem with recent 5.4 kernels on CPU type 06-3c-03 (Intel(R) Core(TM) i7-4720HQ CPU @ 2.60GHz), not on a CPU 06-9e-09 (Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz), but it does occur on older CPUs of type 06-25-05 and 06-2a-07 when running kernel 5.4.0 generic.

Recently tested kernels on Bionic/Focal, apt up-to-date and using most recent available microcode:
Linux version 5.4.0-65-generic 20.04 - CPU 06-2a-07 (16GB RAM) - bad blocks on zram when swapping.
Linux version 5.4.0-64-lowlatency 18.04 - CPU 06-9e-09 (16GB RAM) - no zram bad blocks.

Notes: I've seen the issue with recent 5.4 kernels for a while now, the bisecting Michele Primavera did seems plausible to me, so it's not 64=>65. Kernel 4.15 (Bionic) does not seem to cause zram corruption at all. I haven't tested Focal's kernel 5.8 yet...