[Bug 83916] New: [BYT ppgtt]webglc cases sporadically cause GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83916

          Priority: high
            Bug ID: 83916
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT ppgtt]webglc cases sporadically cause GPU hang
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 106358
  --> https://bugs.freedesktop.org/attachment.cgi?id=106358&action=edit
dmesg

System Environment:
--------------------------
Platform: BYT
Libdrm:    (master)libdrm-2.4.56-21-g8c2ae1695913990cbe6c6a8aa294f354eba33bd0
Mesa:    (master)dbc2d81d2ba12354876eb67c79e8a71e57e97f3c
Xserver:(master)xorg-server-1.16.0-176-gd3427717f2c6a473dc3d20631dff653e4e37228e
Xf86_video_intel:(master)2.99.916-39-g11444619457aa8121efc937291f1d944ac42265d
Libva:    (master)e0d25ece01e7aba819c910e98c4fb4706cdab055
Libva_intel_driver:(master)bc2e06ef0f89b264fe968fbff4f06e425385c3d8
Kernel:   (drm-intel-nightly)43df30da20447e2856b2761215ff274886a9f931

Bug detailed description:
---------------------------
Run all Webglc cases, GPU hang appears sporadically. It happens on different
case when run multiple cycles. Fail rate:2/3. 
If this issue occurs, run reboot, system is no response. 
Add i915.enable_ppgtt=1 on latest nightly kernel, run 3 cycles, it works well.

Reproduce steps:
-------------------------
1. xinit
2. go to
https://www.khronos.org/registry/webgl/conformance-suites/1.0.2/webgl-conformance-tests.html
run all webglc cases.

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