[SR-Users] "kamctl restart" fails

[Yu Boot]

# kamctl restart

INFO: Stopping Kamailio :
INFO: stopped

INFO: Starting Kamailio :
  2292 pts/0    S+     0:00 /bin/egrep kamailio
-rw-r--r--. 1 kamailio kamailio 5 Aug  8 11:15 /var/run/kamailio.pid
INFO: PID file exists (/var/run/kamailio.pid)! Kamailio already running?


"service kamailio restart" works fine. What's wrong?

Centos 6.9 x64, Kamailio 4.3 installed from official repo.