[Bug 77849] New: [IVB/HSW Regression]igt/gen7_forcewake_mt fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77849

          Priority: medium
            Bug ID: 77849
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB/HSW Regression]igt/gen7_forcewake_mt fails
        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 97848
  --> https://bugs.freedesktop.org/attachment.cgi?id=97848&action=edit
dmesg

System Environment:
--------------------------
Platform: IVB HSW
kernel:   (drm-intel-next-queued)c79057922ed6c2c6df1214e6ab4414fea1b23db2

Bug detailed description:
----------------------------
igt/gen7_forcewake_mt fails on IVB and HSW on
-nightly(1e771b84e47085ef9b6efea1321e7cb5a8b2c065) and
-next-queued(c79057922ed6c2c6df1214e6ab4414fea1b23db2). the result it pass on
latest -fixes(b6842feb63a23a6a988f4e1ffb93408d8ff6931e).

It's a regression issue:

good commit: c27dc20db6c0bcf4078b4da65d8d20f6f0b74229
bad commit: c79057922ed6c2c6df1214e6ab4414fea1b23db2
We will bisect it later.

output on -nightly kernel:
./gen7_forcewake_mt
IGT-Version: 1.6-g78e4c2b (x86_64) (Linux:
3.14.0_drm-intel-next-queued_c79057_20140423+ x86_64)
Test assertion failure function gem_execbuf, file ioctl_wrappers.c:396:
Last errno: 22, Invalid argument
Failed assertion: ret == 0



Reproduce steps:
---------------------------- 
1.  ./gen7_forcewake_mt

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