[Bug 90002] New: [BYT]igt/gem_evict_everything at mlocked-hang takes more than 10 minutes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90002

            Bug ID: 90002
           Summary: [BYT]igt/gem_evict_everything at mlocked-hang takes more
                    than 10 minutes
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         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 115041
  --> https://bugs.freedesktop.org/attachment.cgi?id=115041&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure, disabled in old testing. bug 84892

Non-working platforms: 

==kernel==
--------------------------
drm-intel-nightly/631c2f8cb69ecbd7dd0494c37dd3c7fbd04de928
commit 631c2f8cb69ecbd7dd0494c37dd3c7fbd04de928
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Sat Apr 11 00:21:05 2015 +0200

    drm-intel-nightly: 2015y-04m-10d-22h-20m-20s UTC integration manifest

==Bug detailed description==
-----------------------------
It takes 20 minutes on BYT with drm-intel-nightly kernel.

output:
IGT-Version: 1.10-g007ff02 (x86_64) (Linux:
4.0.0-rc7_drm-intel-nightly_631c2f_20150411+ x86_64)
Subtest mlocked-hang: SUCCESS (1249.273s)

real    20m54.155s
user    0m1.518s
sys     2m38.376s

==Reproduce steps==
---------------------------- 
1. time ./gem_evict_everything --run-subtest mlocked-hang

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