[Bug 86992] New: [BYT Regression]igt/gem_ctx_exec/reset-pin-leak causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86992

            Bug ID: 86992
           Summary: [BYT Regression]igt/gem_ctx_exec/reset-pin-leak causes
                    system hang
           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: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 110438
  --> https://bugs.freedesktop.org/attachment.cgi?id=110438&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes.
Good commit on -next-queued:
a259953ea9b7c86e437e0a620d37aad150a00b8f(2014_11_25)

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: 2014_12_04(fails)
origin/drm-intel-next-queued:6c930688cb04e81ca71092baf585f7ea1c670368(fails)
    drm/i915/skl: Update the DDI translation values for DP/eDP 1.3
origin/drm-intel-fixes: b0616c5306b342ceca07044dbc4f917d95c4f825(works)
    drm/i915: Unlock panel even when LVDS is disabled

==Bug detailed description==
-----------------------------
igt/gem_ctx_exec/reset-pin-leak causes system hang

Output:
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./gem_ctx_exec
--run-subtest reset-pin-leak
IGT-Version: 1.8-g4e5c16c (x86_64) (Linux:
3.18.0-rc7_drm-intel-nightly_691817_20141202+ x86_64)
Test assertion failure function __real_main174, file gem_ctx_exec.c:224:
Failed assertion: exec(fd, handle, I915_EXEC_RENDER, ctx_id) == 0
Last errno: 14, Bad address
Subtest reset-pin-leak: FAIL (24.082s)
Warning on condition flags != 0 in fucntion check_stop_rings, file
drmtest.c:112
i915_ring_stop flags on exit 0x400000ff, can't quiescent gpu cleanly


==Reproduce steps==
---------------------------- 
1. ./gem_ctx_exec --run-subtest reset-pin-leak

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