STINNER Victor <victor.stin...@gmail.com> added the comment:

> I'm playing with Gentoo in LXC running on ARM-based QNAP NAS, and when trying 
> to compile Python 3.5.4, the build failed with "Fatal Python error: failed to 
> get random numbers to initialize Python" (full details at 
> https://forums.gentoo.org/viewtopic-p-8172124.html ).

I'm surprised. Python 3.5.4 does contain my latest fix: commit 
035ba5da3e53e45c712b39fe1f6fb743e697c032 (bpo-29157).

> Looking at random.c, pyurandom returns -1 instead of falling back to 
> dev_urandom when py_getrandom returns -1, so the attached fix is simple.

Ignoring failures is not a good idea.

What is the result of the getrandom() function?

> glibc in the environment is 2.25 (supports getrandom), while kernel is 3.10 
> (doesn't support getrandom).

I expect n < 0 with errno = ENOSYS: py_getrandom() should return 0 in this 
case, not -1.

----------
nosy: +vstinner

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