GPU hang when using VAAPI to decode VP9
Firefox recently implemented VAAPI support on X11 using EGL. The feature is still being developed, and mpv seems to be able to use VAAPI without issue, so the bug may well be in the browser. If that seems to be the case, please let me know and I will open an issue on Mozilla's tracker instead.
System:
Linux 5.8.0-1-amd64 #1 SMP Debian 5.8.7-1 (2020-09-05) x86_64
Attached are the journalctl output and the crash dump. Let me know if you need more information.
Edited by SimonPilkington