Bug 248777

Summary: graphics/drm-devel-kmod: Panic when transcoding a video
Product: Ports & Packages Reporter: Alex Levy <a13xlevy>
Component: Individual Port(s)Assignee: freebsd-x11 (Nobody) <x11>
Status: New ---    
Severity: Affects Only Me CC: grahamperrin, manu
Priority: --- Keywords: panic
Version: LatestFlags: bugzilla: maintainer-feedback? (x11)
Hardware: amd64   
OS: Any   
Description Flags
Backtrace of the generated crash dump
Extract of /var/log/messages when the panic happened none

Description Alex Levy 2020-08-20 11:15:46 UTC
Created attachment 217372 [details]
Backtrace of the generated crash dump


I'm running 13.0-CURRENT r364031 with latest drm-devel-kmod installed as I needed support for the graphics chipset of my Celeron G5900.

The kernel reliably panics when transcoding a certain video with Plex which leverages libva (hence the graphics chipset).

I have an ongoing discussion about it : https://lists.freebsd.org/pipermail/freebsd-current/2020-August/076728.html

The interesting part is that the panic never happen when I plug a screen on HDMI port and happens all the time when no screen plugged. The frame #17 from the backtrace refers to intel_plane_can_remap() so there might be hint in there.

I dumped the content of structures from several backtrace frames that you can see in the discussion linked above.

Comment 1 Alex Levy 2020-08-20 11:17:42 UTC
Created attachment 217373 [details]
Extract of /var/log/messages when the panic happened
Comment 2 Emmanuel Vadot freebsd_committer 2020-09-17 09:55:29 UTC
Is this still relevant ?
Comment 3 Graham Perrin 2021-07-08 02:29:04 UTC
(In reply to Alex Levy from comment #0)

Is this reproducible with 5.5.0.g20210707?