I just tested from latest linus' git and with this latest patch and I do see the problem still.

I had nothing in dmesg when the problem triggered since I didn't apply the debug patch provided some time ago. However, I did have an error that might or might not be related to the patch (I can just say that git from about a week ago didn't show this error):

[   23.764976] kbuildsycoca4 used greatest stack depth: 6028 bytes left
[   75.535185] [drm:i915_gem_execbuffer] *ERROR* Object f638f3c0 appears more than once in object list
[   75.602287] [drm:i915_gem_execbuffer] *ERROR* Object f6160060 appears more than once in object list
[   75.617678] [drm:i915_gem_execbuffer] *ERROR* Object f6160060 appears more than once in object list
[   75.671562] [drm:i915_gem_execbuffer] *ERROR* Object f638f420 appears more than once in object list
[   75.818337] [drm:i915_gem_execbuffer] *ERROR* Object f638f480 appears more than once in object list
[   75.881663] [drm:i915_gem_execbuffer] *ERROR* Object f638f4e0 appears more than once in object list
[   75.901713] [drm:i915_gem_execbuffer] *ERROR* Object f638f4e0 appears more than once in object list
[   76.150701] [drm:i915_gem_execbuffer] *ERROR* Object f638f300 appears more than once in object list
[   76.170042] [drm:i915_gem_execbuffer] *ERROR* Object f638f300 appears more than once in object list
[   76.242343] [drm:i915_gem_execbuffer] *ERROR* Object f638f540 appears more than once in object list
[   76.306192] [drm:i915_gem_execbuffer] *ERROR* Object f638f420 appears more than once in object list
[   76.312373] [drm:i915_gem_execbuffer] *ERROR* Object f638f420 appears more than once in object list
[   76.317394] [drm:i915_gem_execbuffer] *ERROR* Object f638f420 appears more than once in object list
[   76.451448] [drm:i915_gem_execbuffer] *ERROR* Object f638f540 appears more than once in object list
[   76.455672] [drm:i915_gem_execbuffer] *ERROR* Object f638f540 appears more than once in object list
[   76.471548] [drm:i915_gem_execbuffer] *ERROR* Object f638f540 appears more than once in object list
[   76.552370] [drm:i915_gem_execbuffer] *ERROR* Object f638f3c0 appears more than once in object list
[   76.567279] [drm:i915_gem_execbuffer] *ERROR* Object f638f3c0 appears more than once in object list
[   76.614682] [drm:i915_gem_execbuffer] *ERROR* Object f638f300 appears more than once in object list
[   76.627649] [drm:i915_gem_execbuffer] *ERROR* Object f638f300 appears more than once in object list
[   76.697832] [drm:i915_gem_execbuffer] *ERROR* Object f638f660 appears more than once in object list
[   76.711030] [drm:i915_gem_execbuffer] *ERROR* Object f638f660 appears more than once in object list
[   76.845556] [drm:i915_gem_execbuffer] *ERROR* Object f638f300 appears more than once in object list
[   76.862304] [drm:i915_gem_execbuffer] *ERROR* Object f638f300 appears more than once in object list
[   77.228811] [drm:i915_gem_execbuffer] *ERROR* Object f638f600 appears more than once in object list
[   77.241402] [drm:i915_gem_execbuffer] *ERROR* Object f638f600 appears more than once in object list
[   77.298431] [drm:i915_gem_execbuffer] *ERROR* Object f638f3c0 appears more than once in object list
[   77.318427] [drm:i915_gem_execbuffer] *ERROR* Object f638f3c0 appears more than once in object list
[   77.446953] [drm:i915_gem_execbuffer] *ERROR* Object f638f5a0 appears more than once in object list
[   77.462289] [drm:i915_gem_execbuffer] *ERROR* Object f638f5a0 appears more than once in object list
[   77.601891] [drm:i915_gem_execbuffer] *ERROR* Object f638f3c0 appears more than once in object list
[   77.614703] [drm:i915_gem_execbuffer] *ERROR* Object f638f3c0 appears more than once in object list
[  187.018764] kio_thumbnail used greatest stack depth: 5644 bytes left

Let me know if I should try something else with this patch or another.