Ubuntu 16.04.5 LTS: desktop freeze

[Paolo Pisati]

Description: Ubuntu 16.04.5 LTS
Release: 16.04

I'm experiencing random dekstop lockup, in particular when maxing out build jobs.
Sometimes, the desktop freeze for a moment but then it recovers and i was able to capture some dmesg output (see attached pics).
Others, it just solid freeze (and numlock + scroll lock lights on my keyboard blinks).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-39-generic 4.15.0-39.42~16.04.1
ProcVersionSignature: Ubuntu 4.15.0-39.42~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-39-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Nov 13 12:09:22 2018
InstallationDate: Installed on 2016-11-15 (727 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)