[Bug 88977] New: [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

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

==System Environment==
--------------------------
Regression: not sure

==kernel==
--------------------------
drm-intel-nightly/0eafcbf6bc5917efd97c9916329c6f859cfb41ed
commit 0eafcbf6bc5917efd97c9916329c6f859cfb41ed
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Feb 3 19:19:19 2015 +0100

    drm-intel-nightly: 2015y-02m-03d-18h-18m-53s UTC integration manifest

==Bug detailed description==
-----------------------------
It sporadically causes <3>[ 1337.391545] [drm:valleyview_pipestat_irq_handler
[i915]] *ERROR* CPU pipe B FIFO underrun. when run automation testing, run it
10 cycles manually, I am unable reproduce this error.

test log:
@test: Intel_gpu_tools/igt_gem_evict_everything_forked-multifd-interruptible
info: @@@Returncode: 0

test case start at: Sun Jan 25 14:55:05 2015
test case end at:   Sun Jan 25 14:55:17 2015

Errors:


Dmesg:
<3>[ 1337.391545] [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": 6.654932022094727,
    "tests": {
        "igt/gem_evict_everything/forked-multifd-interruptible": {
            "dmesg": "[ 1337.391545] [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_evict_everything
--run-subtest forked-multifd-interruptible",
            "result": "dmesg-warn",
            "time": 6.459430932998657,
            "out": "IGT-Version: 1.9-g87edb51 (x86_64) (Linux:
3.19.0-rc7_drm-intel-nightly_0eafcb_20150204+ x86_64)\nSubtest
forked-multifd-interruptible: SUCCESS (6.138s)\n"
        }
    },

==Reproduce steps==
---------------------------- 
1. run all igt cases

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