signal (11): Segmentation fault in PyJulia 0.4.1,Python 2/3,Julia 1.1.0

Running this simple python script

```
from julia import Julia
import numpy as np

ju = Julia()
ju.include("LJ.jl")

for j in range(100000):
e = ju.LJ.energy(np.random.rand(10,3))
if j % 50 == 0:
print(j,e)
```

where LJ.jl is the following Julia script

```
module LJ
using LinearAlgebra

function energy(R::Matrix{T}) where {T}
E = zero(T)
for i = 1:size(R, 2)-1, j = i+1:size(R,2)
r= norm(R[:,i] - R[:,j])
E += r^(-12) - 2 * r^(-6)
end
return E
end
end
```

gives me the following error:

```
signal (11): Segmentation fault
in expression starting at no file:0
ConvParam at /usr/local/src/conda/python-3.7.3/Modules/_ctypes/callproc.c:685 [inlined]
_ctypes_callproc at /usr/local/src/conda/python-3.7.3/Modules/_ctypes/callproc.c:1132
PyCFuncPtr_call at /usr/local/src/conda/python-3.7.3/Modules/_ctypes/_ctypes.c:3969
_PyObject_FastCallKeywords at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
function_code_fastcall at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
function_code_fastcall at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
function_code_fastcall at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
function_code_fastcall at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
function_code_fastcall at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyFunction_FastCallDict at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyObject_Call_Prepend at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyObject_FastCallDict at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
object_vacall at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
PyObject_CallFunctionObjArgs at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
slot_tp_getattr_hook at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
builtin_getattr at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyMethodDef_RawFastCallKeywords at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyCFunction_FastCallKeywords at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
function_code_fastcall at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyFunction_FastCallDict at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyObject_Call_Prepend at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyObject_FastCallDict at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
object_vacall at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
PyObject_CallFunctionObjArgs at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
slot_tp_getattr_hook at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
PyEval_EvalCodeEx at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
PyEval_EvalCode at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
builtin_exec at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyMethodDef_RawFastCallKeywords at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyCFunction_FastCallKeywords at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyFunction_FastCallKeywords at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyFunction_FastCallKeywords at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyFunction_FastCallKeywords at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
call_function.lto_priv.1536 at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyFunction_FastCallDict at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
_PyFunction_FastCallDict at /root/miniconda3/lib/libpython3.7m.so.1.0 (unknown line)
macro expansion at /opt/julia/share/site/packages/PyCall/0jMpb/src/exception.jl:81 [inlined]
__pycall! at /opt/julia/share/site/packages/PyCall/0jMpb/src/pyfncall.jl:44
_pycall! at /opt/julia/share/site/packages/PyCall/0jMpb/src/pyfncall.jl:29
#call#89 at /opt/julia/share/site/packages/PyCall/0jMpb/src/pyfncall.jl:11 [inlined]
PyObject at /opt/julia/share/site/packages/PyCall/0jMpb/src/pyfncall.jl:89
jl_fptr_trampoline at /buildworker/worker/package_linux64/build/src/gf.c:1864
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2219
do_call at /buildworker/worker/package_linux64/build/src/interpreter.c:323
eval_value at /buildworker/worker/package_linux64/build/src/interpreter.c:411
eval_body at /buildworker/worker/package_linux64/build/src/interpreter.c:625
jl_interpret_toplevel_thunk_callback at /buildworker/worker/package_linux64/build/src/interpreter.c:885
unknown function (ip: 0xfffffffffffffffe)
unknown function (ip: 0x7f7b815ad9af)
unknown function (ip: 0x2)
jl_interpret_toplevel_thunk at /buildworker/worker/package_linux64/build/src/interpreter.c:894
jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:764
jl_toplevel_eval_flex at /buildworker/worker/package_linux64/build/src/toplevel.c:713
jl_toplevel_eval_in at /buildworker/worker/package_linux64/build/src/toplevel.c:793
eval at ./boot.jl:328
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2219
exec_options at ./client.jl:243
_start at ./client.jl:436
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2219
unknown function (ip: 0x40191d)
unknown function (ip: 0x401523)
__libc_start_main at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
unknown function (ip: 0x4015c4)
Allocations: 34898355 (Pool: 34895806; Big: 2549); GC: 74
Segmentation fault
```

I've tested this several times and on a range of different machines (Ubuntu, MacOS). The error pops up every time after a several hundred thousand iterations. The error also pops up using Python 2. The Julia version is 1.1.0.

I've also tried using ```python-jl``` and it still gives raise to the segmentation fault.