STINNER Victor added the comment:

Sorry for the delay.

getrandom_nonblocking_v4.patch LGTM, but I made a major change: if getrandom() 
fails with EAGAIN, it now *always* fall back on reading /dev/urandom.

I also documented the change in os.urandom() documentation and in Misc/NEWS.

I pushed the fix to Python 3.5 and 3.6. Python 2.7 doesn't use getrandom() and 
so doesn't need the fix. I now consider that the bug is fixed.

If you consider that it's important enough to retry calling getrandom() each 
time os.urandom() is called, please open a new issue with a patch and elaborate 
your rationale :-)

----------
resolution:  -> fixed
status: open -> closed

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<http://bugs.python.org/issue26839>
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