Comment # 11 on bug 1096072 from Franck Bui

Talked to Antonio privately and it appears that gcrypt run in fips mode for
some *unknown* reasons. This has the side effect to run some self tests on each
program linked to libgcrypt (I think) and those self tests exhaust /dev/urandom
somehow.

The gcrypt fips mode is activated by the presence of /etc/gcrypt/fips_enabled
file. And removing this file solves this issue as well as bug #1096050.

So I guess the question is now how was this file created at all.