Segmentation fault while executing


I am using Artik710 development kit to communicate with metamotionC module.
I followed the steps as mentioned in the Readme for the Python SDK.

While done with the given steps after executing the example script, I get the following segmentation fault error:

[root@artik examples]# python3
[ 480.280000] pgd = ffffffc0286c7000
[ 480.280000] [00000030] *pgd=0000000068fdc003, *pud=0000000068fdc003, *pmd=0000000000000000
Segmentation fault

details are provided in the text file attached!

I have gone through the earlier segmentation fault queries, but none solved the issue. Can some one please help me out with this since I have been stuck on this for a long time now.


  • Use the latest metawear package (v0.5.0 as of this post).

    It's highly likely the underlying C++ sdk needs to be tweaked for your specific board, however, we do not have an Artick 710 board nor do we support it. The first thing you should do is clone the C++ SDK and try running the unit tests on your machine.

    git clone
    cd MetaWear-SDK-Cpp
    make test
  • edited August 2018

    Hello Eric,

    Thank you for the quick response.
    I followed the steps given by you and after running the unit tests of the Cpp-sdk it gave the following error:

    make test
    mkdir -p build/x86/release/src/metawear/platform/cpp
    mkdir -p build/x86/release/src/metawear/core/cpp
    mkdir -p build/x86/release/src/metawear/peripheral/cpp
    mkdir -p build/x86/release/src/metawear/processor/cpp
    mkdir -p build/x86/release/src/metawear/sensor/cpp
    mkdir -p build/x86/release/src/metawear/impl/cpp
    mkdir -p build/x86/release/src/metawear/dfu/cpp
    g++ -MMD -MP -MF "build/x86/release/src/metawear/platform/cpp/threadpool.d" -c -o build/x86/release/src/metawear/platform/cpp/threadpool.o -std=c++11 -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -Wall -Werror -Isrc -DMETAWEAR_DLL -DMETAWEAR_DLL_EXPORTS -O3 -m32 src/metawear/platform/cpp/threadpool.cpp
    g++: error: unrecognized command line option ‘-m32’
    Makefile:65: recipe for target 'build/x86/release/src/metawear/platform/cpp/threadpool.o' failed
    make: *** [build/x86/release/src/metawear/platform/cpp/threadpool.o] Error 1

    To get rid of this error, I commented out the below code in the Makefile:

    // #ifeq ($(MACHINE),x86)
    // # CXXFLAGS+=-m32
    // # LD_FLAGS+=-m32
    // #else ifeq ($(MACHINE),x64)
    // # CXXFLAGS+=-m64
    // # LD_FLAGS+=-m64
    // #else ifeq ($(MACHINE),arm)
    // # CXXFLAGS+=-marm
    // # LD_FLAGS+=-marm
    // #else
    // # $(error Unrecognized "MACHINE" value, use 'x86', 'x64', or 'arm')
    // #endif

    After commenting the above code in the MakeFile, the build proceeded but failed while running the unit test:

    python3 -m unittest discover -s test
    Traceback (most recent call last):
    File "/usr/lib/python3.5/", line 184, in _run_module_as_main
    "main", mod_spec)
    File "/usr/lib/python3.5/", line 85, in _run_code
    exec(code, run_globals)
    File "/usr/lib/python3.5/unittest/", line 18, in
    File "/usr/lib/python3.5/unittest/", line 93, in init
    File "/usr/lib/python3.5/unittest/", line 117, in parseArgs
    File "/usr/lib/python3.5/unittest/", line 228, in _do_discovery
    self.test =, self.pattern,
    File "/usr/lib/python3.5/unittest/", line 341, in discover
    tests = list(self._find_tests(start_dir, pattern))
    File "/usr/lib/python3.5/unittest/", line 398, in _find_tests
    full_path, pattern, namespace)
    File "/usr/lib/python3.5/unittest/", line 452, in _find_test_path
    return self.loadTestsFromModule(module, pattern=pattern), False
    File "/usr/lib/python3.5/unittest/", line 123, in loadTestsFromModule
    File "/usr/lib/python3.5/unittest/", line 92, in loadTestsFromTestCase
    loaded_suite = self.suiteClass(map(testCaseClass, testCaseNames))
    File "/usr/lib/python3.5/unittest/", line 24, in init
    File "/usr/lib/python3.5/unittest/", line 57, in addTests
    for test in tests:
    File "/root/artik/freshStart/MetaWear-SDK-Cpp/test/", line 29, in init
    self.initialized_fn= FnVoid_VoidP_VoidP_Int(self.initialized)
    NameError: name 'FnVoid_VoidP_VoidP_Int' is not defined
    Makefile:109: recipe for target 'test' failed
    make: *** [test] Error 1

    It is unable to find "FnVoid_VoidP_VoidP_Int".

    **The whole "make test" output is attached in the post.

    Following are the specifications of the Artik 710 module:

    • High performance, _**8-core, 64-bit ARM® Cortex® A-53 **_processor with Wi-Fi®, Bluetooth®, ZigBee®, Thread
    • ARM MALI™ GPU for multimedia, graphics applications
    • 1GB RAM, 4GB flash (eMMC)
    • Enterprise-class security with hardware secure element and Secure OS (710s)
    • Ubuntu Linux package with multimedia, connectivity, graphics, power management and security libraries

    Please help me with this since it has been stuck for several weeks now. Let me know if you need any other output or details related to the query.

    Thank you in advance!

  • edited August 2018

    That type is defined in the Python bindings file:

    The Makefile sets the PythonPath env variable to point the appropriate so it should pick up the types and functions defined in that bindings file.

    Based on the error, it seems like python is not looking in the bindings directory.

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