[Bug 80701] [BYT Bisected]igt/kms_flip subcases cause "WARNING: CPU: 0 PID: 3943 at drivers/gpu/drm/i915/intel_dp.c:3092 intel_dp_complete_link_train+0x100/0x27f [i915]()" sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80701

Imre Deak <imre.deak at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |73037

--- Comment #4 from Imre Deak <imre.deak at gmail.com> ---
(In reply to comment #3)
> (In reply to comment #2)
> > This looks like a duplicate of bug 73037. Could you double-check that the
> > bisect result is correct, that is you can't reproduce the bug on the parent
> > commit (a497c3ba1d97)?
> 
> Another bug 81367 reproduced on the parent commit(a497c3ba1d97), and can not
> find CallTrace on this commit.
> 
> root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_flip
> --run-subtest plain-flip-fb-recreate-interruptible
> IGT-Version: 1.7-g4d4f4b2 (x86_64) (Linux:
> 3.16.0-rc2_kcloud_a497c3_20140722+ x86_64)
> Test assertion failure function kmstest_force_connector, file igt_kms.c:461:
> Failed assertion: debugfs_fd != -1
> Last errno: 2, No such file or directory
> Subtest plain-flip-fb-recreate-interruptible: FAIL

This is most probably timing related, so you'd need to run the test multiple
times on each commit. In any case the same WARN is present in bug 73037 on a
kernel much older than the bisected commit here, so as a minimum let's set that
bug as a dependency.

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