[Bug 77511] New: [ILK SNB IVB BYT HSW BDW]igt/drv_module_reload cause system random hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77511

          Priority: medium
            Bug ID: 77511
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [ILK SNB IVB BYT HSW BDW]igt/drv_module_reload cause
                    system random hang
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 97450
  --> https://bugs.freedesktop.org/attachment.cgi?id=97450&action=edit
drv_module_reload hang

System Environment:
--------------------------
Platform: ILK SNB IVB BYT HSW BDW
kernel:   (drm-intel-nightly)8c7da4ebd7c0aa6f24a558634f6f59204cf65c0b

Bug detailed description:
----------------------------
System random hung while run drv_module_reload.

The hung rate about 1 out of 3.

output:
module successfully unloaded


Reproduce steps:
---------------------------- 
1.  ./drv_module_reload

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