[Bug 92296] New: Xorg crashes with reverse PRIME (intel+nouveau) and OpenGL/VA-API

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92296

            Bug ID: 92296
           Summary: Xorg crashes with reverse PRIME (intel+nouveau) and
                    OpenGL/VA-API
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: mschiffer+misc at universe-factory.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118678
  --> https://bugs.freedesktop.org/attachment.cgi?id=118678&action=edit
Xorg.log for crash 1

I've found various ways to crash Xorg in a reverse PRIME setup; I'm reporting
them as a single bug as the backtraces look similar.

For the tests, I used the xorg-server 1.17.2 Arch Linux packages with recent
git versions of xf86-video-intel and xf86-video-nouveau.

* Crash 1: I setup the (nouveau) reverse PRIME output as primary output. When I
set a GL or VA-API window to fullscreen on the reverse PRIME output, Xorg
segfaults. Might be related to #91491.

* Crash 2: I configure the intel driver to use DRI3. As soon as I open a window
using GL or VA-API on the reverse PRIME output, Xorg segfaults.

* Crash 3: While normally the reverse PRIME setup as primary output would only
make Xorg crash when a fullscreen window was involved, I also got a random
crash in this setup without a fullscreen window.

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