lebeg opened a new issue #11565: Using ThreadedEnginePerDevice crashes on Raspberry Pi URL: https://github.com/apache/incubator-mxnet/issues/11565 ## Description The failure is not deterministic and the library import to python passes in 1 of 4 times. The creation of NDArray's in this case fails though in all cases with similar message that the stack is corrupted. ## Environment info (Required) ``` pi@raspberrypi:~ $ cat /etc/os-release PRETTY_NAME="Raspbian GNU/Linux 8 (jessie)" NAME="Raspbian GNU/Linux" VERSION_ID="8" VERSION="8 (jessie)" ID=raspbian ID_LIKE=debian HOME_URL="http://www.raspbian.org/"; SUPPORT_URL="http://www.raspbian.org/RaspbianForums"; BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"; pi@raspberrypi:~ $ /lib/arm-linux-gnueabihf/libc.so.6 --version GNU C Library (Debian GLIBC 2.19-18+deb8u10) stable release version 2.19, by Roland McGrath et al. Copyright (C) 2014 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Compiled by GNU CC version 4.8.4. Compiled on a Linux 3.16.7 system on 2017-06-19. Available extensions: crypt add-on version 2.1 by Michael Glad and others GNU Libidn by Simon Josefsson Native POSIX Threads Library by Ulrich Drepper et al BIND-8.2.3-T5B libc ABIs: UNIQUE For bug reporting instructions, please see: <http://www.debian.org/Bugs/>. ``` ## Error Message: ``` pi@raspberrypi:~ $ python Python 2.7.9 (default, Sep 17 2016, 20:26:04) [GCC 4.9.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import mxnet as mx Segmentation fault: 11 Stack trace returned 3 entries: [bt] (0) /usr/local/lib/python2.7/dist-packages/mxnet/libmxnet.so(dmlc::StackTrace()+0x21) [0x7048475a] [bt] (1) /usr/local/lib/python2.7/dist-packages/mxnet/libmxnet.so(+0x413602) [0x7052b602] [bt] (2) /lib/arm-linux-gnueabihf/libc.so.6(__default_sa_restorer_v2+0) [0x76d75180] terminate called after throwing an instance of 'std::system_error' what(): Resource deadlock avoided Aborted ``` ## Steps to reproduce 1. `ci/build.py -p armv7` 2. `pip install mxnet-1.3.0-py2.py3-none-any.whl` on RPi ## What have you tried to solve it? 1. make / cmake based builds 2. using a different RaspberryPi - on some devices it works 3. reflashed the device 4. compiled and linked with openblas statically 5. connected device to more powerful usb-power source 6. python 2/3 MXNet is working properly if an environment variable is set: ``` export MXNET_ENGINE_TYPE="NaiveEngine" ``` By default the engine type is ThreadedEnginePerDevice and this fails immediately if set explicitly.
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