After this has happened more often that I would've liked, I connected to this machine through SSH a few times, when I would get this freeze. Looking at htop, I noticed that Xorg was using a CPU core to the max, and I wouldn't be able to kill it, not even with root privileges.
Looking at the Xorg logs didn't bring anything useful, except a few lines similar to this, involving the keyboard and mouse:
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(EE) event3 - USB OPTICAL MOUSE: client bug: event processing lagging behind by 15ms, your system is too slow
I've noticed this tends to happen more often when I run emulation/virtualisation software (DOSBox, VirtualBox).
Does anyone know any way of diagnosing this issue, so that I could fix it, or perhaps send a bug report if it's appropriate?
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$ inxi -SG
System:
Kernel: 5.10.0-1-amd64 x86_64 bits: 64 Desktop: GNOME
Distro: Debian GNU/Linux bullseye/sid
Graphics:
Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics
driver: i915 v: kernel
Display: x11 server: X.Org 1.20.10 driver: intel resolution: 1366x768~60Hz
OpenGL: renderer: Mesa DRI Intel HD Graphics 4600 (HSW GT2)
v: 4.5 Mesa 20.3.2