Bug 85362

Summary: opencv_test_imgproc crash when test OCL_Imgproc/HoughLines.RealImage
Product: Beignet Reporter: Yan Wang <yan.wang>
Component: BeignetAssignee: Zhigang Gong <zhigang.gong>
Status: CLOSED FIXED QA Contact:
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: All   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments: error log and back trace for debugging.

Description Yan Wang 2014-10-23 09:55:09 UTC
Created attachment 108293 [details]
error log and back trace for debugging.

prerequisite:
unset OPENCV_TEST_DATA_PATH

Run:
opecv-test-imgproc --gtest_filter=OCL_Imgproc/HoughLines.RealImage*

Error:
[ RUN      ] OCL_Imgproc/HoughLines.RealImage/0
ASSERTION FAILED: defIt != bbIt->second->end() && defIt->second != NULL
  at file /home/yanwang/beignet/backend/src/ir/value.cpp, function gbe::ir::LiveOutSet::RegDefSet& gbe::ir::LiveOutSet::getDefSet(const gbe::ir::BasicBlock*, gbe::ir::Register), line 91
Comment 1 Yan Wang 2014-10-23 09:57:57 UTC
opencv: master(3.0-dev) commit e40567eaeeac42dd9dfd4791812fa866df84c206
beginet: master commit 1ea7977ee84df4c7607c82f0846307c63f8364df
Comment 2 Zhigang Gong 2014-10-24 03:04:30 UTC
Please verify whether the patch, I just sent to the mail list, could fix this bug. Thanks.

commit 2234c334af6c0254969e0748c7ba14ef2c8a009e
Author: Zhigang Gong <zhigang.gong@intel.com>
Date:   Fri Oct 24 09:55:34 2014 +0800

    GBE: handle dead loop BBs in liveness analysis.

    Considering the following CFG, our previous liveness analysis will only
    back traverse from the exit point BB, thus the BB 6 and 7 will not be handled.

        4---
        |   |
        |   |
        5 --|---> 10 ---> ret
        |   |
        |   |
        6<--
        |
        |<--
        7   |
        |   |
         ---

    Although the CFG looks not a normal application as once it goes to
    block 6, it will enter a dead loop and will never return, we still need
    to compile it successfully.

    This patch is to fix the bug at:
    https://bugs.freedesktop.org/show_bug.cgi?id=85362

    Signed-off-by: Zhigang Gong <zhigang.gong@intel.com>
Comment 3 Yan Wang 2014-10-24 05:34:34 UTC
I tried your patch and the bug is fixed. Thanks.

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