[Bug 111136] [CI][SHARDS] igt at kms_flip@absolute-wf_vblank - fail - select timed out or error (ret 0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111136

--- Comment #2 from Ankit <ankit.k.nautiyal at intel.com> ---
Assessment:

Reproducible: 1.7% http://gfx-ci.fi.intel.com/cibuglog-ng/. No failures in
recent history: bug_history
:http://gfx-ci.fi.intel.com/cibuglog-ng/results/all?query=test_name%3D%27igt%40kms_flip%40absolute-wf_vblank%27

Impact: Low

What does the sub-test do: The sub-test absolute-wf_vblank tests a set no. of
vblanks after doing a flip and checks if the vblank events are received by the
userspace in a tolerable limit of time. This is one of many sub-tests that
check various combination of flip done and vblank events and make sure that the
events are received timely.

The sub-test does a flip and waits for flip-done event, before going to the
actual test for absolute vblanks. After receiving the flip-done event, the
sub-test runs in a tight loop for a given  'n' seconds. In 'n' seconds, it
repeatedly waits for 10 vblanks and checks if the time in which these are
received is less than some tolerable limit in msecs. This is repeated for each
Pipe and (connected) Connector combination.

The issue: The issue is quite rare, and difficult to reproduce. After the flip,
the test waits for flip-done event using select command on the drm_fd,  but is
not able to get the event. Finally the test times out, resulting in the
failure.

Since the reproducible rate is very less, and the test is not seen to fail in
recent history for all platforms, this issue is suggested to be closed.

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