[Bug 87575] New: [IVB/BYT]igt/gem_ctx_thrash/threads sporadically takes more than 10 minutes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87575

            Bug ID: 87575
           Summary: [IVB/BYT]igt/gem_ctx_thrash/threads sporadically 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 111143
  --> https://bugs.freedesktop.org/attachment.cgi?id=111143&action=edit
dmesg

==System Environment==
--------------------------
Regression: no, new case

Non-working platforms: IVB/BYT

==kernel==
--------------------------
drm-intel-nightly/4fa23142a15526f4a4b5df61f26eacdd558a849a
commit 4fa23142a15526f4a4b5df61f26eacdd558a849a
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Fri Dec 19 15:33:33 2014 +0100

    drm-intel-nightly: 2014y-12m-19d-14h-33m-07s UTC integration manifest

==Bug detailed description==
-----------------------------
It sporadically takes more than 10 minutes, It happens 1 in 3 runs.

output:
[root at x-ivb9 tests]# time ./gem_ctx_thrash --run-subtest threads
IGT-Version: 1.9-gc537cdb (x86_64) (Linux:
3.18.0_drm-intel-nightly_4fa231_20141
Creating 49152 contexts (assuming of size 65536)
Creating 3072 surfaces (of size 1048576)
Subtest threads: SUCCESS (512.432s)

real    8m32.463s
user    1m54.617s
sys     12m51.291s
[root at x-ivb9 tests]# time ./gem_ctx_thrash --run-subtest threads
IGT-Version: 1.9-gc537cdb (x86_64) (Linux:
3.18.0_drm-intel-nightly_4fa231_20141
Creating 49152 contexts (assuming of size 65536)
Creating 3072 surfaces (of size 1048576)
Subtest threads: SUCCESS (550.889s)

real    9m10.935s
user    1m55.664s
sys     13m47.713s
[root at x-ivb9 tests]# time ./gem_ctx_thrash --run-subtest threads
IGT-Version: 1.9-gc537cdb (x86_64) (Linux:
3.18.0_drm-intel-nightly_4fa231_20141222+ x86_64)
Creating 49152 contexts (assuming of size 65536)
Creating 3072 surfaces (of size 1048576)
Subtest threads: SUCCESS (616.115s)

real    10m16.133s
user    2m29.785s
sys     15m1.551s


==Reproduce steps==
---------------------------- 
1. time ./gem_ctx_thrash --run-subtest threads

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