FYI, this doesn't affect Trusty nor Utopic.
That udev code lock code was introduced in 2014-04-14:
systemd commit 3ebdb81ef088afd3b4c72b516beb5610f8c93a0d [1]
[1] http://cgit.freedesktop.org/systemd/systemd/commit/?id=3ebdb81ef088afd3b4c72b516beb5610f8c93a0d
FYI, this doesn't affect Trusty nor Utopic.
That udev code lock code was introduced in 2014-04-14:
systemd commit 3ebdb81ef088afd 3b4c72b516beb56 10f8c93a0d [1]
[1] http:// cgit.freedeskto p.org/systemd/ systemd/ commit/ ?id=3ebdb81ef08 8afd3b4c72b516b eb5610f8c93a0d