Re: amdgpu hard freeze with Firefox MOZ_ACCELERATED/MOZ_WEBRENDER

On Mon, Jun 01, 2026 at 07:53:15AM -0400, Donald Pellegrino wrote:

> 	I can hard-freeze a system when Firefox is run with graphics
> 	acceleration and WebRender enabled. The system becomes
> 	completely unresponsive. The mouse pointer stops and
> 	Ctrl+Alt+F1 does not switch consoles. I have to hard
> 	power-cycle the machine. After reboot, fsck is required.
[...]
> 	This same hardware, config, and user workload had run reliably
> 	for many months on OpenBSD 7.8. This issue appeared after the
> 	upgrade from 7.8 to 7.9.

I've had intermittent hard crashes on my amdgpu machine too, starting at
some point between 7.8 and 7.9 (and, at first, I ascribed it to another
cause, so I didn't really note when it started happening). I now _think_
it's caused by programs -- including, but not only Firefox -- that use
hardware acceleration (in my case e.g. Alacritty). Unfortunately I have
absolutely no idea why and given how big amdgpu and friends are, debugging
this must be a nightmare.

If you have the ability to do so, you could bisect snapshots (e.g. using
[1]) and see when the problem was introduced. If that narrows it down, it
might make a big difference to fixing things.


Laurie

[1] https://ftp.hostserver.de/archive/