rsyslog doesn't start and dumps core when imfile plugin is used

Issue

• When using the imfile plugin to read external log files, rsyslog doesn't start any and dumps core:

  # systemctl start rsyslog
  # systemctl status rsyslog
  [...]
  Process: XXX ExecStart=/usr/sbin/rsyslogd -n $SYSLOGD_OPTIONS (code=killed, signal=SEGV)
  [...]
  

• The following coredump backtrace can be seen

  # gdb /usr/sbin/rsyslogd coredump
  [...]
  (gdb) bt
  #0  0x00007efdca236cd7 in process_symlink (chld=chld@entry=0x563611ba6030, symlink=symlink@entry=0x7efdb00022c0 "/var/log/myplace_symlink") at imfile.c:710
  #1  0x00007efdca2370cb in poll_tree (chld=0x563611ba6030) at imfile.c:754
  #2  0x00007efdca23284d in fs_node_walk (node=<optimized out>, f_usr=f_usr@entry=0x7efdca236e60 <poll_tree>) at imfile.c:957
  #3  0x00007efdca232859 in fs_node_walk (node=<optimized out>, f_usr=f_usr@entry=0x7efdca236e60 <poll_tree>) at imfile.c:958
  #4  0x00007efdca232859 in fs_node_walk (node=<optimized out>, f_usr=f_usr@entry=0x7efdca236e60 <poll_tree>) at imfile.c:958
  #5  0x00007efdca232859 in fs_node_walk (node=<optimized out>, f_usr=f_usr@entry=0x7efdca236e60 <poll_tree>) at imfile.c:958
  #6  0x00007efdca236591 in doPolling () at imfile.c:1925
  #7  runInput (pThrd=<optimized out>) at imfile.c:2152
  #8  0x0000563610eb74f4 in thrdStarter (arg=0x563611baf0a0) at ../threads.c:226
  #9  0x00007efdcdd8fea5 in start_thread (arg=0x7efdbe22d700) at pthread_create.c:307
  #10 0x00007efdcce838dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
  (gdb)