os.kill(pid, signal.SIGTERM) has no effect using paddlepaddle/paddle:latest-dev

[typhoonzero]

Some unit tests like test_listen_and_serv_op.py, run the test with paddlepaddle/paddle:latest-dev docker image, the call os.kill(pid, signal.SIGTERM) have no effect, while run kill pid in the shell can successfully terminate the process. When using manylinux docker images, this issue is gone.

More info: #11470

[typhoonzero]

@velconia Can you please take a look at this?

[velconia]

OK

[velconia]

具体是说, 只能支持SIGINT, 不能支持SIGTERM是吗?

[typhoonzero]

需要支持SIGINT, SIGTERM，不能使用SIGKILL

[gongweibao]

How to reproduce the hang ISSUE?

[velconia]

抱歉, 我也没能复现, 请问方便描述下具体的复现方法吗?

是在 paddlepaddle/paddle:latest-dev 这个 image里编译后执行ctest吗? @typhoonzero

[velconia]

I got some problems in running paddle_build.sh in paddlepaddle/paddle:latest-dev, maybe the code below in paddle_build.sh was wrong

    # Support build for all python versions, currently
    # including cp27-cp27m and cp27-cp27mu.
    PYTHON_FLAGS=""
    if [ "$1" != "" ]; then
        echo "using python abi: $1"
        if [ "$1" == "cp27-cp27m" ]; then
            export LD_LIBRARY_PATH=/opt/_internal/cpython-2.7.11-ucs2/lib:${LD_LIBRARY_PATH#/opt/_internal/cpython-2.7.11-ucs4/lib:}
            export PATH=/opt/python/cp27-cp27m/bin/:${PATH}
            PYTHON_FLAGS="-DPYTHON_EXECUTABLE:FILEPATH=/opt/python/cp27-cp27m/bin/python
        -DPYTHON_INCLUDE_DIR:PATH=/opt/python/cp27-cp27m/include/python2.7
        -DPYTHON_LIBRARIES:FILEPATH=/opt/_internal/cpython-2.7.11-ucs2/lib/libpython2.7.so"
        elif [ "$1" == "cp27-cp27mu" ]; then
            export LD_LIBRARY_PATH=/opt/_internal/cpython-2.7.11-ucs4/lib:${LD_LIBRARY_PATH#/opt/_internal/cpython-2.7.11-ucs2/lib:}
            export PATH=/opt/python/cp27-cp27mu/bin/:${PATH}
            PYTHON_FLAGS="-DPYTHON_EXECUTABLE:FILEPATH=/opt/python/cp27-cp27mu/bin/python
        -DPYTHON_INCLUDE_DIR:PATH=/opt/python/cp27-cp27mu/include/python2.7
        -DPYTHON_LIBRARIES:FILEPATH=/opt/_internal/cpython-2.7.11-ucs4/lib/libpython2.7.so"
        fi
    fi

It seems that the PYTHON_FLAGS should be

export PYTHON_FLAGS="-DPYTHON_EXECUTABLE:FILEPATH=/usr/bin/python  -DPYTHON_INCLUDE_DIR:PATH=/usr/include/python2.7  -DPYTHON_LIBRARIES:FILEPATH=/usr/lib/python2.7/config-x86_64-linux-gnu/libpython2.7.so"

[velconia]

After some effort, I got the stack, it seems that libusb_exit was the reason why our psever hangs up

So, I walks through the depencecies of libusb and got this information follow:

So, the opencv-python depends on the libusb, and after I installed opencv via pip install opencv-python, things were fixed, so it seemed that the opencv installed via apt-get is different with pip

According to this answer in stackoverflow, we should install both of them to avoid this problem