[Bug 88977] [BSW]igt/gem_evict_everything sporadically causes *ERROR* CPU pipe B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88977

--- Comment #3 from lu hua <huax.lu at intel.com> ---
gem_userptr_blits_forked-sync-swapping-multifd-mempressure-interruptible also
has this error.

@test:
Intel_gpu_tools/igt_gem_userptr_blits_forked-sync-swapping-multifd-mempressure-interruptible
info: @@@Returncode: 0

test case start at: Sun Jan 25 15:48:40 2015
test case end at:   Sun Jan 25 15:49:19 2015

Errors:


Dmesg:
<3>[  711.421830] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun


Output:
             command   pid dev master a   uid      magic
Test Environment check: Succeeded.
[1/1] dmesg-warn: 1 |
[1/1] dmesg-warn: 1 /


Thank you for running Piglit!
Results have been written to /GFX/Test/Piglit/piglit/t
{
    "results_version": 2,
    "uname": "Linux x-bsw01 3.19.0-rc7_drm-intel-nightly_0eafcb_20150204+ #38
SMP Wed Feb 4 11:26:26 CST 2015 x86_64 x86_64 x86_64 GNU/Linux\n",
    "time_elapsed": 33.72999906539917,
    "tests": {
       
"igt/gem_userptr_blits/forked-sync-swapping-multifd-mempressure-interruptible":
{
            "dmesg": "[  711.421830] [drm:valleyview_pipestat_irq_handler
[i915]] *ERROR* CPU pipe B FIFO underrun",
            "returncode": 0,
            "err": "",
            "environment": "PIGLIT_SOURCE_DIR=\"/GFX/Test/Piglit/piglit\"
PIGLIT_PLATFORM=\"mixed_glx_egl\"",
            "command":
"/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests/gem_userptr_blits
--run-subtest forked-sync-swapping-multifd-mempressure-interruptible",
            "result": "dmesg-warn",
            "time": 33.49824404716492,
            "out": "IGT-Version: 1.9-g87edb51 (x86_64) (Linux:
3.19.0-rc7_drm-intel-nightly_0eafcb_20150204+ x86_64)\nAperture size is 2048
MiB\nTotal RAM is 3876 MiB\nTesting unsynchronized mappings...\nTesting
synchronized mappings...\nSubtest
forked-sync-swapping-multifd-mempressure-interruptible: SUCCESS (33.470s)\n"
        }
    },

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