Encountered a crash with the following logs.
I have already added no_proxy=*, and it fixed the issue which i can replicate consistent. However, this crash does not happen every time, maybe once in a few week.

Process:               Python [66435]
Path:                  /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python
Identifier:            Python
Version:               3.6.8 (3.6.8)
Code Type:             X86-64 (Native)
Parent Process:        Python [65077]
Responsible:           Python [66435]
User ID:               501

Date/Time:             2019-07-24 21:45:29.722 +0800
OS Version:            Mac OS X 10.14.2 (18C54)
Report Version:        12
Bridge OS Version:     3.5 (16P5125)
Anonymous UUID:        3F729BF3-2BB1-3830-B6FE-D22CA431DE5A


Time Awake Since Boot: 1600000 seconds

System Integrity Protection: enabled

Crashed Thread:        2

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000109b23aa2
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [66435]

VM Regions Near 0x109b23aa2:
    MALLOC_LARGE           0000000109aa3000-0000000109b23000 [  512K] rw-/rwx SM=COW  
--> 
    __TEXT                 0000000109b27000-0000000109b3d000 [   88K] r-x/rwx SM=COW  /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/numpy/.dylibs/libgcc_s.1.dylib

Application Specific Information:
*** multi-threaded process forked ***
crashed on child side of fork pre-exec 

Thread 2 Crashed:
0   libsystem_trace.dylib         	0x00007fff7d6fdab3 _os_log_cmp_key + 4
1   libsystem_c.dylib             	0x00007fff7d5aaa5e rb_tree_find_node + 53
2   libsystem_trace.dylib         	0x00007fff7d6fbc81 os_log_create + 370
3   libnetwork.dylib              	0x00007fff7c04058f nwlog_legacy_init_once + 47
4   libsystem_pthread.dylib       	0x00007fff7d6e1ce4 __pthread_once_handler + 66
5   libsystem_platform.dylib      	0x00007fff7d6d7acb _os_once_callout + 18
6   libsystem_pthread.dylib       	0x00007fff7d6e1c7f pthread_once + 56
7   libnetwork.dylib              	0x00007fff7c024ccd networkd_settings_init + 669
8   libnetwork.dylib              	0x00007fff7c024982 networkd_settings_get_bool + 18
9   libnetwork.dylib              	0x00007fff7c0244f0 -[NWConcrete_nw_parameters initWithStack:] + 160
10  libnetwork.dylib              	0x00007fff7c023d97 nw_path_create_evaluator_for_endpoint + 487
11  libnetwork.dylib              	0x00007fff7c2451bc nw_nat64_v4_address_requires_synthesis + 220
12  libsystem_info.dylib          	0x00007fff7d609e83 _gai_nat64_v4_address_requires_synthesis + 67
13  libsystem_info.dylib          	0x00007fff7d609210 _gai_nat64_second_pass + 512
14  libsystem_info.dylib          	0x00007fff7d5e7b4a si_addrinfo + 1978
15  libsystem_info.dylib          	0x00007fff7d5e7262 _getaddrinfo_internal + 242
16  libsystem_info.dylib          	0x00007fff7d5e715d getaddrinfo + 61
17  _socket.cpython-36m-darwin.so 	0x00000001092c24ed socket_getaddrinfo + 621
18  org.python.python             	0x0000000106d63697 _PyCFunction_FastCallDict + 183
19  org.python.python             	0x0000000106de5747 call_function + 439
20  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
21  org.python.python             	0x0000000106de61af _PyEval_EvalCodeWithName + 2447
22  org.python.python             	0x0000000106de6ae1 fast_function + 545
23  org.python.python             	0x0000000106de5721 call_function + 401
24  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
25  org.python.python             	0x0000000106de61af _PyEval_EvalCodeWithName + 2447
26  org.python.python             	0x0000000106de6ae1 fast_function + 545
27  org.python.python             	0x0000000106de5721 call_function + 401
28  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
29  org.python.python             	0x0000000106de6a3d fast_function + 381
30  org.python.python             	0x0000000106de5721 call_function + 401
31  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
32  org.python.python             	0x0000000106de61af _PyEval_EvalCodeWithName + 2447
33  org.python.python             	0x0000000106de6ae1 fast_function + 545
34  org.python.python             	0x0000000106de5721 call_function + 401
35  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
36  org.python.python             	0x0000000106de61af _PyEval_EvalCodeWithName + 2447
37  org.python.python             	0x0000000106de6dfb _PyFunction_FastCallDict + 763
38  org.python.python             	0x0000000106d1a6b7 _PyObject_FastCallDict + 247
39  org.python.python             	0x0000000106d1a7d5 _PyObject_Call_Prepend + 149
40  org.python.python             	0x0000000106d1a4f0 PyObject_Call + 96
41  org.python.python             	0x0000000106d7badd slot_tp_init + 125
42  org.python.python             	0x0000000106d77d09 type_call + 313
43  org.python.python             	0x0000000106d1a685 _PyObject_FastCallDict + 197
44  org.python.python             	0x0000000106de5648 call_function + 184
45  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
46  org.python.python             	0x0000000106de6a3d fast_function + 381
47  org.python.python             	0x0000000106de5721 call_function + 401
48  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
49  org.python.python             	0x0000000106de6a3d fast_function + 381
50  org.python.python             	0x0000000106de5721 call_function + 401
51  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
52  org.python.python             	0x0000000106de6a3d fast_function + 381
53  org.python.python             	0x0000000106de5721 call_function + 401
54  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
55  org.python.python             	0x0000000106de6a3d fast_function + 381
56  org.python.python             	0x0000000106de5721 call_function + 401
57  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
58  org.python.python             	0x0000000106de6a3d fast_function + 381
59  org.python.python             	0x0000000106de5721 call_function + 401
60  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
61  org.python.python             	0x0000000106de6a3d fast_function + 381
62  org.python.python             	0x0000000106de5721 call_function + 401
63  org.python.python             	0x0000000106de1eb7 _PyEval_EvalFrameDefault + 27559
64  org.python.python             	0x0000000106de6c5c _PyFunction_FastCallDict + 348
65  org.python.python             	0x0000000106d1a6b7 _PyObject_FastCallDict + 247
66  org.python.python             	0x0000000106d1a7d5 _PyObject_Call_Prepend + 149
67  org.python.python             	0x0000000106d1a4f0 PyObject_Call + 96
68  org.python.python             	0x0000000106e2d396 t_bootstrap + 70
69  org.python.python             	0x0000000106e26be9 pythread_wrapper + 25
70  libsystem_pthread.dylib       	0x00007fff7d6e3305 _pthread_body + 126
71  libsystem_pthread.dylib       	0x00007fff7d6e626f _pthread_start + 70
72  libsystem_pthread.dylib       	0x00007fff7d6e2415 thread_start + 13