[Mesa-dev] [Bug 97766] Multiple EGL displays with multiple window systems leads to a crash

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97766

            Bug ID: 97766
           Summary: Multiple EGL displays with multiple window systems
                    leads to a crash
           Product: Mesa
           Version: 12.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: medium
         Component: EGL
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: legrand.cedric.01 at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

Created attachment 126460
  --> https://bugs.freedesktop.org/attachment.cgi?id=126460&action=edit
mesa-12.0.2-multiple-egl-displays.patch

When opening multiple displays from multiple window systems, an application
will crash. The second display is opened with the first one driver, leading to
a crash. I know this is a side case, but I could not find it forbidden in the
EGL spec.

This may be usefull for example when opening an X11 display and then a Wayland
one to render Wayland applications in X11. I know it can be rendered directly,
but my use case is more complex than this.

This bug was reported against Mir some years ago, but it is still not fixed in
Mesa 12.0.2. You may find the bug here :
https://bugs.launchpad.net/mir/+bug/1122394

I updated the Mir patch to apply against the latest release, please find it
attached. It seems to work after a quick test, but I did not deeply tested it
for the main reason that I don't know how. I don't have a simple example, but I
can make one if needed.

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