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bug#36380: service urandom-seed takes too long on boot
From: |
Leo Famulari |
Subject: |
bug#36380: service urandom-seed takes too long on boot |
Date: |
Sun, 22 Mar 2020 16:19:19 -0400 |
On Sun, Mar 22, 2020 at 08:43:33AM +0000, Brice Waegeneire wrote:
> This article has been updated since then with a section[0] about a fix
> authored by Linus[1][2] and merged in Linux 5.4. The gist of it that now
> `getrandom()' will actively try to collect entropy in early boot, if it
> is missing, by using the CPU jitter. The Debian wiki is saying the same[3].
The issue here is not related to getrandom() or our kernel. I think the
bug is still relevant.
The Guix system unconditionally reads from /dev/hwrng if it exists, and
there is no reason for that to take a noticeable amount of time.
But this bug report revealed that some VPS providers have a broken
deployment that does cause delays. Who knows how they are feeding
/dev/hwrng... they would not reply to my questions.
It doesn't really matter though, the problem is ours to fix.
We need to make this read time out after a second, but in the past I
could not figure out how to do this without crashing the system (I'm not
a strong Schemer).
Help is still wanted!