[Bug 94829] New: X crash when starting minetest with compositing and DRI3 PRIME

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94829

            Bug ID: 94829
           Summary: X crash when starting minetest with compositing and
                    DRI3 PRIME
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: haagch at frickel.club
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 122718
  --> https://bugs.freedesktop.org/attachment.cgi?id=122718&action=edit
segfault backtrace with kwin

xorg-server 1.18.2
xf86-video-intel latest git 90792c9

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Wimbledon XT [Radeon HD 7970M] (rev ff)

When starting "DRI_PRIME=1 minetest", single player mode, right when the
loading screen seems to be finished, x.org crashes, when
* Using dri3 prime offloading AND
* compositing is active (tested with kwin_x11 opengl compositor and compton
--backend glx)

It does NOT crash
* with dri3 offloading when no compositor is running
* with dri2 offloading (DRI_PRIME=1 LIBGL_DRI3_DISABLE=1 minetest)
* starting a compositor after starting the game

I'm getting different backtraces, I'll attach the three I have got so far.

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