System/video freeze on AMD GPU using 5.3.0 kernel

[Ioannis Ramfos]

Following a kernel update on Kubuntu 18.04 from 5.0 to the latest hwe version 5.3.0, the system started "freezing" after a few days of operation (with the system being in suspend mode during most of each day). With kernel 5.0 there was no such problem, even after many months of operation (again with suspend/resume instead of shutting down). This has happened each time I use the 5.3 kernel (4-5 times so far).

The actual behaviour is that the video froze, apart from the mouse cursor that was moving normally but (seemingly) not activating anything. To reboot gracefully, I tested Ctrl-Alt+F[1-3] to try to enable a console (did not show a console), followed by Ctrl-Alt-Del, but it did not work. There seemed to be some disk activity indicated by the LEDs. To reboot the system, I used the SysRq sequence and the filesystem was synced and the system was rebooted.

Additionally, there are some video glitches from time to time, but I cannot find a usage pattern that produces them.

Attached is a dump from syslog showing something that seems like memory leaks from the GPU.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.3.0-40-generic 5.3.0-40.32~18.04.1
ProcVersionSignature: Ubuntu 5.3.0-40.32~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-40-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.11
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Feb 19 20:10:39 2020
InstallationDate: Installed on 2019-02-24 (360 days ago)
InstallationMedia: Kubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

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[Launchpad Janitor (janitor)]

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