[Bug 89527] New: [ILK]igt/gem_mmap_wc/set-cache-level cause not able to be stoped, and reboot after this case was run will faill.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89527

            Bug ID: 89527
           Summary: [ILK]igt/gem_mmap_wc/set-cache-level cause not able to
                    be stoped, and reboot after this case was run will
                    faill.
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hengx.ding at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 114213
  --> https://bugs.freedesktop.org/attachment.cgi?id=114213&action=edit
dmesg

==System Environment==
--------------------------
Regression: No, I can't find a good commit.

Non-working platforms: ILK

==kernel==
--------------------------
origin/drm-intel-nightly: c09a3b7f343bc87a132ef107cb263e57f8246b88(2015-03-10
)

==Bug detailed description==
-----------------------------
run igt/gem_mmap_wc/set-cache-level and this case will not finish, when you
tried to stop it with Ctrl+c or kill -9 xxx, you will get no response.

==Reproduce steps==
---------------------------- 
1. ./gem_mmap_wc --run-subtest set-cache-level
2. try to stop this case pressing Ctrl+c or use kill command
3. try to reboot.

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