o Major bugfixes (hidden service directory, security):
    - Fix an assertion failure in the hidden service directory code, which
      could be used by an attacker to remotely cause a Tor relay process to
      exit. Relays running earlier versions of Tor 0.3.0.x should upgrade.
      This security issue is tracked as tracked as
      TROVE-2017-002. Fixes bug 22246; bugfix on 0.3.0.1-alpha.