samskalicky edited a comment on issue #16187:
URL:
https://github.com/apache/incubator-mxnet/issues/16187#issuecomment-713719234
Heres the full stack trace from the given example on v1.8 MX:
```
#0 0x00007fffdee8748d in std::vector<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > > >
mxnet::op::custom::List<(CustomOpPropCallbacks)1>(nnvm::NodeAttrs const&) ()
from /home/ubuntu/18_fixes/python/mxnet/../../lib/libmxnet.so
#1 0x00007fffdee77bd8 in mxnet::op::custom::AttrParser(nnvm::NodeAttrs*) ()
from /home/ubuntu/18_fixes/python/mxnet/../../lib/libmxnet.so
#2 0x00007fffe54d8a32 in nnvm::Symbol::CreateFunctor(nnvm::Op const*,
std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >,
std::hash<std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >,
std::allocator<std::pair<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
> > >) ()
from /home/ubuntu/18_fixes/python/mxnet/../../lib/libmxnet.so
#3 0x00007fffe3c492d1 in MXSymbolCreateAtomicSymbol () from
/home/ubuntu/18_fixes/python/mxnet/../../lib/libmxnet.so
#4 0x00007ffff6607ec0 in ffi_call_unix64 () from
/home/ubuntu/anaconda3/lib/python3.6/lib-dynload/../../libffi.so.6
#5 0x00007ffff660787d in ffi_call () from
/home/ubuntu/anaconda3/lib/python3.6/lib-dynload/../../libffi.so.6
#6 0x00007ffff681cdae in _ctypes_callproc ()
from
/home/ubuntu/anaconda3/lib/python3.6/lib-dynload/_ctypes.cpython-36m-x86_64-linux-gnu.so
#7 0x00007ffff681d7e5 in PyCFuncPtr_call ()
```
Its failing in the MXNet Python Custom Op, but on the C++ side here:
https://github.com/apache/incubator-mxnet/blob/v1.x/src/operator/custom/custom.cc#L106
after it calls back into Python here:
https://github.com/apache/incubator-mxnet/blob/v1.x/python/mxnet/operator.py#L733
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