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0e1f616
(Get the code!)
Just my 2 cents: we had the same problem here after the Firefox 51.0.1 update (just one machine is affected anyway, the others updated with no problem). The error message is NOT related to python, but I get graphics errors like the ones seen in bug #1643200:
[GFX1]: Failed 2 buffer db=0 dw=0 for 0, 0, 1920, 876
[GFX1]: Failed 2 buffer db=0 dw=0 for 0, 0, 1920, 876
[GFX1]: Failed 2 buffer db=0 dw=0 for 0, 0, 1920, 876
Anyway, excluding Firefox from Apparmor (as with the OP's first suggestion) works around the problem. My suspect is bad interaction with the driver for the videocard of that specific machine on which we have the problem.