[Bug 109218] New: PresentPixmap doesn't work with XSync fences, and crashes server

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109218

            Bug ID: 109218
           Summary: PresentPixmap doesn't work with XSync fences, and
                    crashes server
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: yshuiv7 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

In an experimental branch of compton, I tried using PresentPixmap with xrender
to achieve tear free display. I discovered that the XSync fence passed to
PresentPixmap never gets triggered, and when I kill compton, the whole server
crashes.

I don't have a stack trace, but X server crashed in a function called
AttendClient trying to dereference 0x28.

Maybe intel driver only supports fences created via DRI3FenceFromFD. That
should've been made clear somewhere (where?), and X server definitely shouldn't
crash.

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