[Bug 67813] New: [HSW Regression]igt/module_reload causes [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 44004 and system hang with headless

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67813

          Priority: high
            Bug ID: 67813
                CC: xunx.fang at intel.com, yangweix.shui at intel.com
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW Regression]igt/module_reload causes
                    [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write
                    to 44004 and system hang with headless
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 83695
  --> https://bugs.freedesktop.org/attachment.cgi?id=83695&action=edit
dmesg

System Environment:
--------------------------
Platform: Haswell
Kernel: (drm-intel-fixes)61c2542b3b8e70fc1b82880c3ef7e2f930875b97

Bug detailed description:
-----------------------------
It happens on Haswell with -fixes ,-queued, -nightly kernel.
Run ./module_reload, system hang.No output info.
If connect VGA or DP or HDMI, It works well.

The latest known good commit:19b2dbde5732170a03bd82cc8bd442cf88d856f7
The latest known bad commit: d4eead50eb206b875f54f66cc0f6ec7d54122c28

Reproduce steps:
----------------------------
1. ./module_reload

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