[Bug 87184] New: [BSW]igt/gem_concurrent_blit and gem_reset_stats sporadically causes *ERROR* Timed out: waiting for Render to ack

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87184

            Bug ID: 87184
           Summary: [BSW]igt/gem_concurrent_blit and gem_reset_stats
                    sporadically causes *ERROR* Timed out: waiting for
                    Render to ack
           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

Non-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/34d267c2ba9c0845432baf959a2c4deed87f3ee4

==Bug detailed description==
-----------------------------
When run automation, it sporadically causes *ERROR* Timed out: waiting for
Render to ack. I am unable to reproduce it manually.
It happens on different subcase if run mutiple cycles.

log:
@test: Intel_gpu_tools/igt_gem_concurrent_blit_gpu-bcs-early-read-forked
info: @@@Returncode: 0

test case start at: Sat Jan  6 23:19:38 2001
test case end at:   Sat Jan  6 23:19:51 2001

Errors:


Dmesg:
<3>[  895.532394] [drm:__vlv_force_wake_get [i915]] *ERROR* Timed out: waiting
for Render to ack.


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 3.18.0_drm-intel-nightly_34d267_20141209+ #2416 SMP
Tue Dec 9 11:25:02 CST 2014 x86_64 x86_64 x86_64 GNU/Linux\n",
    "time_elapsed": 7.836741924285889,
    "tests": {
        "igt/gem_concurrent_blit/gpu-bcs-early-read-forked": {
            "dmesg": "[  895.532394] [drm:__vlv_force_wake_get [i915]] *ERROR*
Timed out: waiting for Render to ack.",
            "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_concurrent_blit
--run-subtest gpu-bcs-early-read-forked",
            "result": "dmesg-warn",
            "time": 7.61755907535553,
            "out": "IGT-Version: 1.8-gf333981 (x86_64) (Linux:
3.18.0_drm-intel-nightly_34d267_20141209+ x86_64)\nusing 2x512 buffers, each
1MiB\nSubtest gpu-bcs-early-read-forked: SUCCESS (7.422s)\n"
        }
    },
    "name": "t",
    "lspci": "00:00.0 Host bridge: Intel Corporation Device 2280 (rev
15)\n00:02.0 VGA compatible controller: Intel Corporation Device 22b0 (rev
15)\n00:03.0 Multimedia controller: Intel Corporation Device 22b8 (rev
15)\n00:0b.0 Signal processing controller: Intel Corporation Device 22dc (rev
15)\n00:13.0 SATA controller: Intel Corporation Device 22a3 (rev 15)\n00:14.0
USB controller: Intel Corporation Device 22b5 (rev 15)\n00:1a.0 Encryption
controller: Intel Corporation Device 2298 (rev 15)\n00:1b.0 Audio device: Intel
Corporation Device 2284 (rev 15)\n00:1c.0 PCI bridge: Intel Corporation Device
22c8 (rev 15)\n00:1c.1 PCI bridge: Intel Corporation Device 22ca (rev
15)\n00:1f.0 ISA bridge: Intel Corporation Device 229c (rev 15)\n00:1f.3 SMBus:
Intel Corporation Device 2292 (rev 15)\n02:00.0 Network controller: Intel
Corporation Wireless 7265 (rev 2b)\n",
    "options": {
        "profile": [
            "tests/igt.py"
        ],
        "dmesg": false,
        "execute": true,
        "log_level": "quiet",
        "concurrent": "some",
        "valgrind": false,
        "sync": false,
        "filter": [
            "igt/gem_concurrent_blit/gpu-bcs-early-read-forked$"
        ],
        "platform": "mixed_glx_egl",
        "exclude_tests": [],
        "env": {
            "PIGLIT_SOURCE_DIR": "/GFX/Test/Piglit/piglit",
            "PIGLIT_PLATFORM": "mixed_glx_egl"
        },
        "exclude_filter": []
    }
}
returncode: 0
result: dmesg-warn
summary: Intel_gpu_tools/igt_gem_concurrent_blit_gpu-bcs-early-read-forked   
DMESG_WARN    

Reproduce steps:
-------------------------
1.  run all igt case

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