Something is eating entropy in test environment

https://mir-jenkins.ubuntu.com/job/build-2-binpkg-mir/arch=i386,compiler=gcc,platform=mesa,release=xenial/519/console

10:34:58 13: [ RUN ] TestClientInput.hidden_clients_do_not_receive_pointer_events
10:34:58 13: [2016-03-17 10:34:58.778663] mirserver: Starting
10:34:58 13: [2016-03-17 10:34:58.780193] mirserver: Selected driver: dummy (version 0.21.0)
10:35:28 13: ERROR: ../../../src/cookie/authority.cpp(112): Throw in function mir::cookie::Secret get_random_data(unsigned int)
10:35:28 13: Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >
10:35:28 13: std::exception::what: Failed to read from device: /dev/random after: 30 seconds
10:35:28 13:
10:35:28 13: unknown file: Failure
10:35:28 13: C++ exception with description "Failed to start server thread" thrown in SetUp().
10:35:28 13: [2016-03-17 10:35:28.880620] mirserver: Stopping
10:35:28 13: [ FAILED ] TestClientInput.hidden_clients_do_not_receive_pointer_events (30116 ms)
10:35:28 13: [ RUN ] TestClientInput.clients_receive_pointer_within_coordinate_system_of_window
10:35:28 13: [2016-03-17 10:35:28.897809] mirserver: Starting
10:35:28 13: [2016-03-17 10:35:28.898771] mirserver: Selected driver: dummy (version 0.21.0)
10:35:58 13: ERROR: ../../../src/cookie/authority.cpp(112): Throw in function mir::cookie::Secret get_random_data(unsigned int)
10:35:58 13: Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >
10:35:58 13: std::exception::what: Failed to read from device: /dev/random after: 30 seconds
10:35:58 13:
10:35:58 13: unknown file: Failure
10:35:58 13: C++ exception with description "Failed to start server thread" thrown in SetUp().
10:35:58 13: [2016-03-17 10:35:58.939169] mirserver: Stopping
10:35:58 13: [ FAILED ] TestClientInput.clients_receive_pointer_within_coordinate_system_of_window (30053 ms)

Looks like lp:~vanvugt/mir/run-without-entropy running on the same m/c kills us.