[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 #17 from Guo Jinxian <jinxianx.guo at intel.com> ---
(In reply to comment #16)
> 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?
> 
I tried 10 times on BDW, and can reproduce this every time.

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

On the parent commit of eef768f2 (b6ed9fb0d9a68cd3e07154b80e78e60778a4887b),
this error unable to reproduce.

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