I had big troubles upgrading tor from v2 to v3 (because of libevent...). Finally, when starting tor manually the circuit is created and sock is working. However, when using
service tor restart, the restart is very quick, sock is not launched and istead of circuit info in syslog, I only get entry
Dec 17 00:51:37 acc-box2 systemd: Started Anonymizing overlay network for TCP (multi-instance-master).
I suspect there is problem with ownership of hidden_directory. Now the owner is root and privileges are 700. For tor service, should it be different?