[Bug 102262] New: [SNB CI] multi-minute cpu stall when running kms_flip at blt-wf_vblank-vs-dpms|modeset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102262

            Bug ID: 102262
           Summary: [SNB CI] multi-minute cpu stall when running
                    kms_flip at blt-wf_vblank-vs-dpms|modeset
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: daniel at ffwll.ch
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

This bug just for recording for posterity what we found out:

On snb CI shards (gt1, but I managed to kill my gt2 a few times too) the system
can seemingly hard-hang when running the above testcases. This was tested on
igt commits

commit c8811338e8a7723b5e99a303361ed97c092fc270 (HEAD -> master, fdo/master)
Author: Kelvin Gardiner <kelvin.gardiner at intel.com>
Date:   Tue Jun 27 14:04:51 2017 -0700

    intel-ci: Add fast-feedback-simulation.testlist

Kernel integration manifest is roughly

drm-intel drm-intel-fixes 781cc76e0c2469cb7ac12ba238a4ea006978e321
        drm/i915: Avoid the gpu reset vs. modeset deadlock
drm-upstream drm-fixes 46828dc77961d9286e55671c4dd3b6c9effadf1a
        Merge branch 'linux-4.13' of git://github.com/skeggsb/linux into
drm-fixes
drm-intel drm-intel-next-fixes 04941829b0049d2446c7042ab9686dd057d809a6
        drm/i915: Hold RPM wakelock while initializing OA buffer
drm-intel drm-intel-next-queued 4e34935fcf691b2f553fdc34502d649bf979a06f
        drm/i915/cnl: Setup PAT Index.
drm-upstream drm-next 0c697fafc66830ca7d5dc19123a1d0641deaa1f6
        Backmerge tag 'v4.13-rc5' into drm-next
sound-upstream for-next c9480d055e306a855f8a8d2b3b097773cd0d5ad0
        sound: emu8000: constify emu8000_ops
sound-upstream for-linus a8e800fe0f68bc28ce309914f47e432742b865ed
        ALSA: usb-audio: Apply sample rate quirk to Sennheiser headset
drm-intel topic/core-for-CI 01cbe29aa8f8d7ffca23cf6e147a17529fae680e
        e1000e: fix buffer overrun while the I219 is processing DMA
transactions
drm-misc drm-misc-next b9c55b6e2cc4369b0688961fa5de0e057f3ec0c4
        drm/vc4: Continue the switch to drm_*_put() helpers
drm-misc drm-misc-next-fixes 1ed134e6526b1b513a14fba938f6d96aa1c7f3dd
        drm/vc4: Fix VBLANK handling in crtc->enable() path
drm-misc drm-misc-fixes a0ffc51e20e90e0c1c2491de2b4b03f48b6caaba
        drm/atomic: If the atomic check fails, return its value first


I'll attach a netconsole log of a typical death, but tldr is that we stall for
a few minutes (with not even the NMI watchdog being able to do anything) until
eventually the system recovers and the batch completes and the dpms/modeset-off
goes through.

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