[issue39853] Segmentation fault with urllib.request.urlopen and threads

[Gilles Duboscq]

Gilles Duboscq <gilles.m.duboscq at oracle.com> added the comment:

I'm not sure it's the same but we have seen stack traces looking like the one there: https://github.com/astropy/astropy/issues/9699

Current thread 0x00007fffa857e3c0 (most recent call first):
  File "/sw/lib/python3.7/socket.py", line 748 in getaddrinfo
  File "/sw/lib/python3.7/socket.py", line 707 in create_connection
  File "/sw/lib/python3.7/http/client.py", line 938 in connect
  File "/sw/lib/python3.7/http/client.py", line 966 in send
  File "/sw/lib/python3.7/http/client.py", line 1026 in _send_output
  File "/sw/lib/python3.7/http/client.py", line 1247 in endheaders
  File "/sw/lib/python3.7/http/client.py", line 1298 in _send_request
  File "/sw/lib/python3.7/http/client.py", line 1252 in request

For us it happens when using multiprocessing: the main process forks 2 processes and both use urlopen at roughly the same time. We are seeing this on Python 3.7.2 on macOS 10.14.3.

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nosy: +gilles-duboscq

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<https://bugs.python.org/issue39853>
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