rsyslog crashes on segfault when disk-assisted queues are corrupted

Issue

• rsyslog segfaults at startup, and systemd restarts it loop forever

  # systemctl start rsyslog
  Job for rsyslog.service failed because a fatal signal was delivered to the control process. See "systemctl status rsyslog.service" and "journalctl -xe" for details.
  
  # journalctl | grep rsyslog
  <TIMESTAMP> <hostname> systemd[1]: rsyslog.service holdoff time over, scheduling restart.
  <TIMESTAMP> <hostname> systemd[1]: rsyslog.service: main process exited, code=killed, status=11/SEGV
  <TIMESTAMP> <hostname> systemd[1]: Unit rsyslog.service entered failed state.
  <TIMESTAMP> <hostname> systemd[1]: rsyslog.service failed.
  <TIMESTAMP> <hostname> systemd[1]: rsyslog.service holdoff time over, scheduling restart.
  <TIMESTAMP> <hostname> systemd[1]: rsyslog.service: main process exited, code=killed, status=11/SEGV
  <TIMESTAMP> <hostname> systemd[1]: Unit rsyslog.service entered failed state.
  

• rsyslog shows this message in debug mode on stderr

  <Obj:1:msg:1:
  +iProtocolVersion:2:1:0:
  +iSeverity:2:1:5:
  +iFacility:2:2:16:
  +m'
  3817.443895127:action 0 queue[DA]:Reg/w0: error property name: 'iFacilit<Obj'
  3817.443898262:action 0 queue[DA]:Reg/w0: error var type: '1'
  Segmentation fault
  

• The following message is seen in the journal

  <TIMESTAMP> <hostname> kernel: rs:action 0 que[29724]: segfault at 5 ip 0000558247132cec sp 00007f75b3cbfb50 error 4 in rsyslogd[55824710c000+95000]