[Bug 81367] [IVB/SNB/BYT/BDW/BSW]igt/kms_flip subcases fail and don't exit testing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81367

--- Comment #16 from Paulo Zanoni <przanoni at gmail.com> ---
Ok, so in addition to the bcs-flip-vs-dpms BDW problem, I found another
problem: if, on HSW, I run:

$ for i in $(seq 2000); do echo; echo === $i; time sudo ./kms_flip
--run-subtest 2x-flip-vs-modeset; done

Then, at some point, the kms_flip command will not exit. It is important to
notice that this only happens once every few hundred times on my machine, not
"always", as implied by QA. Can QA confirm whether this happens every time, or
just sometimes on QA's machines?

And for this specific problem, commit eef768f283466b6d7cb3f08381f72ccf3951dc99
seems to be the root-cause, just like pointed by comment #4.

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