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KWin was able to get NULL-context in the call intelUnbindContext. But a call _mesa_glthread_finish is not resistent to such case. Case can be catched with steps: 1. Create both glx and egl contexts 2. Make glx as current 3. Make egl as current 4. Reset glx context 5. Make egl as current Solution adds proper finishing of glthread-context (context will be taken from the requested dri-context for unbinding, but not from the saved current context). Piglit-test: piglit!87 Cc: 19.1 19.2 <mesa-stable@lists.freedesktop.org> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110814 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111271 Fixes: dca36d55 (i965: Implement threaded GL support) Signed-off-by: Sergii Romantsov <sergii.romantsov@globallogic.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> (cherry picked from commit 1dce75c1)
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