rsyslogd produces errors and consumes high amount of RAM

Issue

• Why does rsyslogd allocates the huge RAM?

3387 root      20   0  203.4g 199.0g   2.3g S 100.3 79.1   4246:16 rsyslogd


~]# systemctl status rsyslog
● rsyslog.service - System Logging Service
   Loaded: loaded (/usr/lib/systemd/system/rsyslog.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2018-06-27 15:05:26 CEST; 1 weeks 1 days ago
     Docs: man:rsyslogd(8)
           http://www.rsyslog.com/doc/
 Main PID: 3387 (rsyslogd)
   Memory: 196.8G
   CGroup: /system.slice/rsyslog.service
           └─3387 /usr/sbin/rsyslogd -n

Jul 06 09:28:37 system.local rsyslogd[3387]: imjournal: fopen() failed for path: '/var/lib/rsyslog/imjournal.state.tmp': Permission denied [v8.24.0 try http://www.rsyslog.com/e/2013 ]
Jul 06 09:28:37 system.local rsyslogd[3387]: imjournal: fopen() failed for path: '/var/lib/rsyslog/imjournal.state.tmp': Permission denied [v8.24.0 try http://www.rsyslog.com/e/2013 ]
Jul 06 09:28:37 system.local rsyslogd[3387]: imjournal: fopen() failed for path: '/var/lib/rsyslog/imjournal.state.tmp': Permission denied [v8.24.0 try http://www.rsyslog.com/e/2013 ]
Jul 06 09:28:37 system.local rsyslogd[3387]: imjournal: fopen() failed for path: '/var/lib/rsyslog/imjournal.state.tmp': Permission denied [v8.24.0 try http://www.rsyslog.com/e/2013 ]
Jul 06 09:28:37 system.local rsyslogd[3387]: imjournal: fopen() failed for path: '/var/lib/rsyslog/imjournal.state.tmp': Permission denied [v8.24.0 try http://www.rsyslog.com/e/2013 ]