[Bug 248777] graphics/drm-devel-kmod: Panic when transcoding a video

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248777

            Bug ID: 248777
           Summary: graphics/drm-devel-kmod: Panic when transcoding a
                    video
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: a13xlevy at gmail.com
          Assignee: x11 at FreeBSD.org
             Flags: maintainer-feedback?(x11 at FreeBSD.org)

Created attachment 217372
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=217372&action=edit
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.

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