[Bug 85541] New: [HSW]igt/kms_setmode/clone-exclusive-crtc causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85541

            Bug ID: 85541
           Summary: [HSW]igt/kms_setmode/clone-exclusive-crtc causes
                    system hang
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108551
  --> https://bugs.freedesktop.org/attachment.cgi?id=108551&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure, it also has bug 68463
Test on drm-intel-next-queued/6e47e3f097cc6c4cb470a805a3fa07a8e8376dab, it also
has this issue.

Non-working platforms: HSW

==kernel==
--------------------------
drm-intel-nightly/32cefad9992e67b4ee7487adf465bd7e189c9c1c

==Bug detailed description==
Run this case, it causes system hang, It happens only one HSW machine.

output:
IGT-Version: 1.8-g15972aa (x86_64) (Linux:
3.18.0-rc2_drm-intel-nightly_32cefa_20141028+ x86_64)
Testing: clone-exclusive-crtc 2 connector combinations
  Test id#1 CRTC count 2
    CRTC[8] [Pipe A] Mode: 640x480 at 60Hz Connectors: VGA-1[18] (NC)

lspci:
00:00.0 Host bridge: Intel Corporation Haswell DRAM Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation Haswell Integrated
Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Haswell HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation Lynx Point USB xHCI Host Controller
(rev 04)
00:16.0 Communication controller: Intel Corporation Lynx Point MEI Controller
#1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-V (rev
04)
00:1a.0 USB controller: Intel Corporation Lynx Point USB Enhanced Host
Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation Lynx Point High Definition Audio
Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #1 (rev
d4)
00:1c.2 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #3 (rev
d4)
00:1c.3 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #4 (rev
d4)
00:1c.4 PCI bridge: Intel Corporation Lynx Point PCI Express Root Port #5 (rev
d4)
00:1d.0 USB controller: Intel Corporation Lynx Point USB Enhanced Host
Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation Lynx Point LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation Lynx Point 6-port SATA Controller 1
[AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation Lynx Point SMBus Controller (rev 04)
01:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA Controller
(rev 01)
02:00.0 PCI bridge: Integrated Technology Express, Inc. Device 8892 (rev 41)
03:02.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22A IEEE-1394a-2000
Controller (PHY/Link) [iOHCI-Lynx]
04:00.0 PCI bridge: PLX Technology, Inc. PEX 8606 6 Lane, 6 Port PCI Express
Gen 2 (5.0 GT/s) Switch (rev ba)
05:07.0 PCI bridge: PLX Technology, Inc. PEX 8606 6 Lane, 6 Port PCI Express
Gen 2 (5.0 GT/s) Switch (rev ba)
06:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection
(rev 03)

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

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