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Date:      Thu, 20 Aug 2020 11:15:46 +0000
From:      bugzilla-noreply@freebsd.org
To:        x11@FreeBSD.org
Subject:   maintainer-feedback requested: [Bug 248777] graphics/drm-devel-kmod: Panic when transcoding a video
Message-ID:  <bug-248777-7141-rH9hSs2XDz@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-248777-7141@https.bugs.freebsd.org/bugzilla/>
References:  <bug-248777-7141@https.bugs.freebsd.org/bugzilla/>

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Bugzilla Automation <bugzilla@FreeBSD.org> has asked freebsd-x11 (Nobody)
<x11@FreeBSD.org> for maintainer-feedback:
Bug 248777: graphics/drm-devel-kmod: Panic when transcoding a video
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248777



--- Description ---
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 fr=
om
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 c=
an
see in the discussion linked above.

Thanks.



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