Christian Heimes added the comment:
I cannot reproduce the open /dev/urandom calls locally. You seem to be running
an old Python version and/or old Kernel. Python prefers getrandom() over
/dev/urandom. The urandom code caches the fd for /dev/urandom.
$ strace ./python -c 'import hashlib' 2>&1 | grep random
getrandom("\xe0\xa5\x00\xda\xe1\xce\x1a\x9c\xe7\x61\x71\xf2\x1d\x15\x63\x19\xdc\x60\x70\x3c\xef\xf6\xcb\xdb",
24, GRND_NONBLOCK) = 24
open("/dev/urandom", O_RDONLY|O_NOCTTY|O_NONBLOCK) = 3
The O_RDONLY|O_NOCTTY|O_NONBLOCK|O_CLOEXEC comes from OpenSSL.
What's your Python version, OpenSSL version, Kernel version and which
platform/distribution are you on?
----------
nosy: +haypo
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<http://bugs.python.org/issue30276>
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