Bug 248777 - graphics/drm-devel-kmod: Panic when transcoding a video
Summary: graphics/drm-devel-kmod: Panic when transcoding a video
Status: New
Alias: None
Product: Ports & Packages
Classification: Unclassified
Component: Individual Port(s) (show other bugs)
Version: Latest
Hardware: amd64 Any
: --- Affects Only Me
Assignee: freebsd-x11 (Nobody)
URL:
Keywords: panic
Depends on:
Blocks:
 
Reported: 2020-08-20 11:15 UTC by Alex Levy
Modified: 2020-09-17 09:55 UTC (History)
1 user (show)

See Also:
bugzilla: maintainer-feedback? (x11)


Attachments
Backtrace of the generated crash dump (3.43 KB, text/plain)
2020-08-20 11:15 UTC, Alex Levy
no flags Details
Extract of /var/log/messages when the panic happened (1.19 KB, text/plain)
2020-08-20 11:17 UTC, Alex Levy
no flags Details

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

Hi,

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.

Thanks.
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 ?