See also https://reproducible-builds.org/docs/randomness/

Some packages want to generate unique IDs
to distinguish different outputs from each other

The preferred fix is to use a hash of all the input instead.

Observed in the wild:
https://bugs.launchpad.net/qutim/+bug/1724148
https://github.com/varnishcache/varnish-cache/pull/2436/files