[issue25420] "import random" blocks on entropy collection on Linux with low entropy

[STINNER Victor]

STINNER Victor added the comment:

I knew the subtle difference between reading from /dev/urandom and
getrandom() syscall: the syscall hangs until /dev/urandom is feeded with
enough entropy. It should be documented in Whats New, os.urandom and maybe
also random doc. Not only python 3.5 was affected by the issue.

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<http://bugs.python.org/issue25420>
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