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> (I wrote some more details here: https://emptysqua.re/blog/getaddrinfo-deadlock/ )
On macOS, Python is only affected if "MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5". Is it still the case in 2020?
Copy/paste of socketmodule.c:
/* On systems on which getaddrinfo() is believed to not be thread-safe,
 (this includes the getaddrinfo emulation) protect access with a lock.
 getaddrinfo is thread-safe on Mac OS X 10.5 and later. Originally it was
 a mix of code including an unsafe implementation from an old BSD's
 libresolv. In 10.5 Apple reimplemented it as a safe IPC call to the
 mDNSResponder process. 10.5 is the first be UNIX '03 certified, which
 includes the requirement that getaddrinfo be thread-safe. See issue #25924.
 It's thread-safe in OpenBSD starting with 5.4, released Nov 2013:
 http://www.openbsd.org/plus54.html
 It's thread-safe in NetBSD starting with 4.0, released Dec 2007:
http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/net/getaddrinfo.c.diff?r1=1.82&r2=1.83
 */
#if ((defined(__APPLE__) && \
 MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5) || \
 (defined(__FreeBSD__) && __FreeBSD_version+0 < 503000) || \
 (defined(__OpenBSD__) && OpenBSD+0 < 201311) || \
 (defined(__NetBSD__) && __NetBSD_Version__+0 < 400000000) || \
 !defined(HAVE_GETADDRINFO))
#define USE_GETADDRINFO_LOCK
#endif