[Bug 84855] [ILK regression]igt kms_rotation_crc/sprite-rotatio causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84855

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #16 from lu hua <huax.lu at intel.com> ---
I bisect it again. I test it on kernel(drm-intel-next-queued
2014_11_10,0b5492d6b5325), it works well. Test it on
kernel(drm-intel-next-queued 2014_11_15, cf3d262e39941d8),it fails. So select
0b5492d6b5325 as good commit and cf3d262e39941d8 as bad commit.
bisect log:
git bisect start 'drivers/gpu/drm'
# good: [0b5492d6b53251acab99b1906a328fac56e08be3] drm/i915: Add gen to the gpu
hang ecode
git bisect good 0b5492d6b53251acab99b1906a328fac56e08be3
# bad: [cf3d262e39941d8f148148e840c00fcbc35a8e6f] drm/i915: Fix comments about
CHV snoop behaviour
git bisect bad cf3d262e39941d8f148148e840c00fcbc35a8e6f
# bad: [b900b949674464d6ede123fb352d3a63690e31ab] drm/i915: move rps irq
enable/disable to i915_irq.c
git bisect bad b900b949674464d6ede123fb352d3a63690e31ab
# bad: [1f9e14baa9139fce2265206746fe5491be7726e9] Merge tag
'topic/core-stuff-2014-11-05' of git://anongit.freedesktop.org/drm-intel into
drm-next
git bisect bad 1f9e14baa9139fce2265206746fe5491be7726e9
# bad: [5a1cbdb0fb6748a52a33f4ccd5d49486d7479fbb] gpu: drm: Fix warning caused
by a parameter description in drm_crtc.c
git bisect bad 5a1cbdb0fb6748a52a33f4ccd5d49486d7479fbb
# bad: [32197aab0425dbecc38462a91bc5c8acf70b2036] gpu:drm: Fix typo in
Documentation/DocBook/drm.xml
git bisect bad 32197aab0425dbecc38462a91bc5c8acf70b2036
# bad: [a1f1a79c51fd493887bb66d932ee66a23f8b1527] drm: drm_err: Remove
unnecessary __func__ argument
git bisect bad a1f1a79c51fd493887bb66d932ee66a23f8b1527
# bad: [bd008e5b2953186fc0c6633a885ade95e7043800] drm: Implement O_NONBLOCK
support on /dev/dri/cardN
git bisect bad bd008e5b2953186fc0c6633a885ade95e7043800
# first bad commit: [bd008e5b2953186fc0c6633a885ade95e7043800] drm: Implement
O_NONBLOCK support on /dev/dri/cardN

bisect result shows: bd008e5b2953186fc0c6633a885ade95e7043800 is the first bad
commit.
commit bd008e5b2953186fc0c6633a885ade95e7043800
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Oct 7 14:13:51 2014 +0100

    drm: Implement O_NONBLOCK support on /dev/dri/cardN

Then I test it on 528a82b41fda78435976c905546c3329c86bb264, the result is skip.
Re-build commit 0b5492d6b53251acab99, it fails.

Test on commit 0b5492d6b5325 which built on 2014_11_10, it works well. But I
re-build commit 0b5492d6b5325, it fails. I guess this fail doesn't caused by
kernel source, maybe kernel config or any other things from 2014_11_10 to
2014_11_15.

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