snap create-key timeouts

[Federico Gimenez]

We have started getting an error on the test ran on zesty during the 2.24 SRU validation, the create-key test https://github.com/snapcore/snapd/blob/master/tests/main/create-key/task.yaml, which exercise the snap create-key command reaches the kill timeout and throws an error http://paste.ubuntu.com/24425481/ I've tried with the previous snapd version, 2.23.6+17.04.1 currently available in the archive, and it fails too.

This happens also with ubuntu-core images built from edge, this is the strace output from a zesty run http://paste.ubuntu.com/24425544/

[Federico Gimenez (fgimenez)]

Seems to be related to the lack of entropy in the test machines and sometimes on real desktops. Installing the rng-tools package, adding "HRNGDEVICE=/dev/urandom" to /etc/default/rng-tools and restarting rng-tools.service solve the issue for classic systems.

[Michael Vogt (mvo)]

This is fixed with https://github.com/snapcore/snapd/pull/4354 which will replace /dev/random with /dev/urandom in the tests.