rsyslog crashes while writing to disk queue in MsgSerialize()

Issue

• rsyslogd dies and often does not restart

• Messages similar to the following seen in the journal. Use journalctl to inspect the journal.

  Oct 04 08:10:02 hostname.example.com kernel: rs:action 8 que[22919]: segfault at 7f6ea4023008 ip 00007f6ecc0bd0e2 sp 00007f6eb6ffca60 error 4 in libc-2.17.so[7f6ecc039000+1c3000]
  Oct 04 08:10:02 hostname.example.com systemd[1]: rsyslog.service: main process exited, code=killed, status=11/SEGV
  Oct 04 08:10:02 hostname.example.com systemd[1]: Unit rsyslog.service entered failed state.
  Oct 04 08:10:02 hostname.example.com systemd[1]: rsyslog.service failed.
  Oct 04 08:10:03 hostname.example.com systemd[1]: rsyslog.service holdoff time over, scheduling restart.
  Oct 04 08:10:03 hostname.example.com systemd[1]: Stopped System Logging Service.
  

  Oct 04 08:10:03 hostname.example.com systemd[1]: rsyslog.service: main process exited, code=killed, status=6/ABRT
  Oct 04 08:10:03 hostname.example.com systemd[1]: Unit rsyslog.service entered failed state.
  Oct 04 08:10:03 hostname.example.com systemd[1]: rsyslog.service failed.
  Oct 04 08:10:03 hostname.example.com systemd[1]: rsyslog.service holdoff time over, scheduling restart.
  Oct 04 08:10:03 hostname.example.com systemd[1]: Stopped System Logging Service.
  Oct 04 08:10:03 hostname.example.com systemd[1]: start request repeated too quickly for rsyslog.service
  Oct 04 08:10:03 hostname.example.com systemd[1]: Failed to start System Logging Service.