[knot-dns-users] 2.9.0 fails to start after upgrade

Hi, I’ve upgraded from 2.8.4 to 2.9.0 (Ubuntu 18.04, using ppa:cz.nic-labs/knot-dns-latest) and now knotd fail to start. After dispatching "service knot start" command knotd process immediately goes to 100% CPU and after 3 minutes it’s killed by systemd because "Start operation timed out”. Here log from service start... Oct 15 11:37:04 ns1-u18 knotc[4972]: Configuration is valid Oct 15 11:37:04 ns1-u18 knotd[4984]: info: Knot DNS 2.9.0 starting Oct 15 11:37:04 ns1-u18 knotd[4984]: info: loaded configuration file '/etc/knot/knot.conf' Oct 15 11:37:04 ns1-u18 knotd[4984]: info: using reuseport for UDP Oct 15 11:37:04 ns1-u18 knotd[4984]: info: binding to interface X.X.X.X@53 Oct 15 11:37:04 ns1-u18 knotd[4984]: info: binding to interface ::@53 Oct 15 11:37:04 ns1-u18 knotd[4984]: info: loading 199 zones [cut] - info that all zones will be loaded Oct 15 11:37:04 ns1-u18 knotd[4984]: info: [xxx.yyy.] zone will be loaded [/cut] Oct 15 11:37:04 ns1-u18 knotd[4984]: info: starting server Oct 15 11:38:34 ns1-u18 systemd[1]: knot.service: Start operation timed out. Terminating. Oct 15 11:40:04 ns1-u18 systemd[1]: knot.service: State 'stop-sigterm' timed out. Killing. Oct 15 11:40:04 ns1-u18 systemd[1]: knot.service: Killing process 4984 (knotd) with signal SIGKILL. Oct 15 11:40:04 ns1-u18 systemd[1]: knot.service: Main process exited, code=killed, status=9/KILL Oct 15 11:40:04 ns1-u18 systemd[1]: knot.service: Failed with result 'timeout'. Any advice what to do? Thank very much -- Lukas Kocourek