wkcn edited a comment on issue #14522: mx.nd.Custom conflicts with memory management URL: https://github.com/apache/incubator-mxnet/issues/14522#issuecomment-476660491 reproduce the bug in CPU environment, it get stuck too. I use GDB to print the backtrace: ``` #0 0x00007ffff7f6aafc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fffe28cacd1 in __gthread_cond_wait (__mutex=<optimized out>, __cond=<optimized out>) at /build/gcc/src/gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:864 #2 0x00007fffe28cacd1 in std::condition_variable::wait(std::unique_lock<std::mutex>&) (this=<optimized out>, __lock=...) at /build/gcc/src/gcc/libstdc++-v3/src/c++11/condition_variable.cc:53 #3 0x00007fffead27065 in mxnet::engine::ThreadedEngine::WaitForVar(mxnet::engine::Var*) () at /home/wkcn/proj/incubator-mxnet/python/mxnet/../../lib/libmxnet.so #4 0x00007fffea739052 in mxnet::NDArray::SyncCopyToCPU(void*, unsigned long) const () at /home/wkcn/proj/incubator-mxnet/python/mxnet/../../lib/libmxnet.so #5 0x00007fffead95697 in MXNDArraySyncCopyToCPU () at /home/wkcn/proj/incubator-mxnet/python/mxnet/../../lib/libmxnet.so #6 0x00007ffff6b386d0 in ffi_call_unix64 () at /usr/lib/libffi.so.6 #7 0x00007ffff6b380a0 in ffi_call () at /usr/lib/libffi.so.6 #8 0x00007ffff6b9e615 in _ctypes_callproc () at /usr/lib/python3.7/lib-dynload/_ctypes.cpython-37m-x86_64-linux-gnu.so #9 0x00007ffff6b9efa0 in () at /usr/lib/python3.7/lib-dynload/_ctypes.cpython-37m-x86_64-linux-gnu.so #10 0x00007ffff7ba163c in _PyObject_FastCallKeywords () at /usr/lib/libpython3.7m.so.1.0 #11 0x00007ffff7beccca in _PyEval_EvalFrameDefault () at /usr/lib/libpython3.7m.so.1.0 #12 0x00007ffff7b752eb in _PyFunction_FastCallKeywords () at /usr/lib/libpython3.7m.so.1.0 #13 0x00007ffff7be7c42 in _PyEval_EvalFrameDefault () at /usr/lib/libpython3.7m.so.1.0 #14 0x00007ffff7b752eb in _PyFunction_FastCallKeywords () at /usr/lib/libpython3.7m.so.1.0 #15 0x00007ffff7be7dfa in _PyEval_EvalFrameDefault () at /usr/lib/libpython3.7m.so.1.0 --Type <RET> for more, q to quit, c to continue without paging--bt \#16 0x00007ffff7b2eb99 in _PyEval_EvalCodeWithName () at /usr/lib/libpython3.7m.so.1.0 #17 0x00007ffff7b2fab4 in PyEval_EvalCodeEx () at /usr/lib/libpython3.7m.so.1.0 #18 0x00007ffff7b2fadc in PyEval_EvalCode () at /usr/lib/libpython3.7m.so.1.0 #19 0x00007ffff7c59c94 in () at /usr/lib/libpython3.7m.so.1.0 #20 0x00007ffff7c5b8be in PyRun_FileExFlags () at /usr/lib/libpython3.7m.so.1.0 #21 0x00007ffff7c5cc75 in PyRun_SimpleFileExFlags () at /usr/lib/libpython3.7m.so.1.0 #22 0x00007ffff7c5eeb7 in () at /usr/lib/libpython3.7m.so.1.0 #23 0x00007ffff7c5f0fc in _Py_UnixMain () at /usr/lib/libpython3.7m.so.1.0 #24 0x00007ffff7dbd223 in __libc_start_main () at /usr/lib/libc.so.6 #25 0x000055555555505e in _start () ```
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