[Bug 90965] New: With LIBGL_DRI3_DISABLE=1 steam: assertion 'get_private(chain->back)->copy' failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90965

            Bug ID: 90965
           Summary: With LIBGL_DRI3_DISABLE=1 steam: assertion
                    'get_private(chain->back)->copy' failed
           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 116470
  --> https://bugs.freedesktop.org/attachment.cgi?id=116470&action=edit
Xorg.0.log, xz compressed

Using

xorg-server 1.17.1
mesa recent git
xf86-video-intel-git 92a2773 with --with-default-accel=sna and
--with-default-dri=3

starting steam with dri3 works
starting glxgears with LIBGL_DRI3_DISABLE=1 glxgears works
starting steam with LIBGL_DRI3_DISABLE=1 steam crashes the xserver

I only tried with kwin with opengl compositing with "full repaint" vsync so
far.

With a release build the xserver segfaults, with xf86-video-intel with
--enable-debug=full it hits an assertion, see attached full debug log.

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