[Bug 85311] New: [HSW Regression]igt/kms_setmode/clone-exclusive-crtc causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85311

            Bug ID: 85311
           Summary: [HSW Regression]igt/kms_setmode/clone-exclusive-crtc
                    causes system hang
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisect_pending
          Severity: normal
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108219
  --> https://bugs.freedesktop.org/attachment.cgi?id=108219&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes.
Good commit on -next-queud: b7c0d9df97c10ec5693a838df2fd53058f8e9e96(bug 68463)

Non-working platforms: HSW

==kernel==
--------------------------
origin/drm-intel-nightly: 1e61c930ec1745ec3cfc77be1cdd023c409de26d(works)
    drm-intel-nightly: 2014y-10m-21d-17h-46m-36s UTC integration manifest
origin/drm-intel-next-queued: f3b190654cbceb0788bfc3b67e4f38ad870dfb84(works)
    drm/i915: add runtime PM get/put call in i915_execlists
origin/drm-intel-fixes: f114040e3ea6e07372334ade75d1ee0775c355e1(fails)
    Linux 3.18-rc1

==Bug detailed description==
igt/gem_exec_parse some subcases failigt/kms_setmode/clone-exclusive-crtc
causes system hang


Output:
[root at x-hsw27 tests]# time ./kms_setmode --run-subtest clone-exclusive-crtc
IGT-Version: 1.8-gbba1cd0 (x86_64) (Linux:
3.18.0-rc1_drm-intel-nightly_1e61c9_20141022+ x86_64)
Testing: clone-exclusive-crtc 2 connector combinations
  Test id#1 CRTC count 2
    CRTC[8] [Pipe A] Mode: 1680x1050 at 60Hz Connectors: VGA-1[18]
    CRTC[12] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[21] (NC)



^Z^C

==Reproduce steps==
---------------------------- 
1. ./kms_setmode --run-subtest clone-exclusive-crtc

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