Comment 15 for bug 1553328

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Gerry Boland (gerboland) wrote : Re: Mir/Unity8 crashes/freezes on nouveau (nv50) in pushbuf_kref() especially with multiple monitors, webbrowser-app or system settings

I have Qt configured (in QtUbuntu/QtMir) to use multi-threaded GL rendering, so we're probably hitting Nouveau's limitations here.

As workaround, I can add code to QtUbuntu/QtMir use single-threaded GL for Nouveau.

If this is easily reproduced, can you try

initctl set-env --global QSG_RENDER_LOOP=basic

and see if everything is more stable? If so, the workaround should do the trick