** Branch linked: lp:~mir-team/mir/lazy-cookie-secret-creation

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https://bugs.launchpad.net/bugs/1536662

Title:
  [regression] Black screen: Mir hangs and then crashes on startup/login
  due to reading from /dev/random

Status in Mir:
  In Progress
Status in Mir 0.19 series:
  Won't Fix
Status in Mir 0.20 series:
  Won't Fix
Status in Unity System Compositor:
  Fix Committed
Status in mir package in Ubuntu:
  Triaged
Status in unity-system-compositor package in Ubuntu:
  Fix Released

Bug description:
  cookie_factory attempts to read data from /dev/random at boot, and
  blocks until it has enough random data or timesout after 30 seconds.

  How I can reproduce
  1. Run the Unity8 greeter as a mir server
  2. Reboot

  Expected behavior: Greeter is displayed as mir && USC run happily
  Actual behavior: Mir throws an exception after 30 seconds

  Work-around:
  Before logging in, move the mouse around lots, for at least 20 seconds. And 
after logging in, while you're looking at a black screen, move the mouse around 
furiously. This will populate the kernel entropy pool sufficiently to avoid the 
hang and crash.

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