STINNER Victor <vstin...@redhat.com> added the comment:

As soon as the "fork" start method "just works" on Linux, I'm not sure why you 
want to use "spawn" by default on Linux.

I don't buy the "consistency" argument here. I'm not surprised that such "low 
level" module like multiprocessing behaves differently depending on the 
platform to get the "native" and most efficient way to spawn subprocesses.

In general, fork is bad, but it's also convenient and people rely on it to 
prepare data in a main process and then "duplicate" the process to inherit 
cooked data.

If someone wants to more away from fork by default, I would suggest to *first* 
enhance multiprocessing documentation to list issues caused by fork(), and 
maybe also described when fork is safe (never doesn't sound like a good answer, 
since so far, I'm not aware of tons of bug reports on Linux caused by fork :-)).

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<https://bugs.python.org/issue33725>
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