Hmmm, it looks like inetd watchdog timer is expiration (systemd or inet's?) is the root cause:
-- Logs begin at Sat 2019-07-06 06:34:04 EDT, end at Sun 2019-08-04 07:55:01 EDT. -- Jul 23 08:37:26 debiant systemd[1]: Starting Internet superserver... Jul 23 08:37:27 debiant systemd[1]: Started Internet superserver. Jul 23 19:00:05 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 23 19:00:05 debiant systemd[1]: inetd.service: Killing process 1628 (inetd) with signal SIGABRT. Jul 23 19:00:07 debiant systemd-coredump[3087]: Process 1628 (inetd) of user 0 dumped core. Jul 23 19:00:07 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 23 19:00:07 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 23 19:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 23 19:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 1. Jul 23 19:00:08 debiant systemd[1]: Stopped Internet superserver. Jul 23 19:00:08 debiant systemd[1]: Starting Internet superserver... Jul 23 19:00:08 debiant systemd[1]: Started Internet superserver. Jul 24 19:19:23 debiant inetd[3105]: could not getpeername Jul 24 19:19:23 debiant inetd[3105]: could not getpeername Jul 24 19:19:23 debiant inetd[3105]: could not getpeername Jul 24 20:00:07 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 24 20:00:07 debiant systemd[1]: inetd.service: Killing process 3105 (inetd) with signal SIGABRT. Jul 24 20:00:08 debiant systemd-coredump[8689]: Process 3105 (inetd) of user 0 dumped core. Jul 24 20:00:08 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 24 20:00:08 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 24 20:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 24 20:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 2. Jul 24 20:00:08 debiant systemd[1]: Stopped Internet superserver. Jul 24 20:00:08 debiant systemd[1]: Starting Internet superserver... Jul 24 20:00:08 debiant systemd[1]: Started Internet superserver. Jul 27 18:00:05 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 27 18:00:05 debiant systemd[1]: inetd.service: Killing process 8701 (inetd) with signal SIGABRT. Jul 27 18:00:08 debiant systemd-coredump[5111]: Process 8701 (inetd) of user 0 dumped core. Jul 27 18:00:08 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 27 18:00:08 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 27 18:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 27 18:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 3. Jul 27 18:00:08 debiant systemd[1]: Stopped Internet superserver. Jul 27 18:00:08 debiant systemd[1]: Starting Internet superserver... Jul 27 18:00:08 debiant systemd[1]: Started Internet superserver. Jul 27 20:00:07 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 27 20:00:07 debiant systemd[1]: inetd.service: Killing process 5129 (inetd) with signal SIGABRT. Jul 27 20:00:08 debiant systemd-coredump[17389]: Process 5129 (inetd) of user 0 dumped core. Jul 27 20:00:08 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 27 20:00:08 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 27 20:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 27 20:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 4. Jul 27 20:00:08 debiant systemd[1]: Stopped Internet superserver. Jul 27 20:00:08 debiant systemd[1]: Starting Internet superserver... Jul 27 20:00:09 debiant systemd[1]: Started Internet superserver. Jul 28 08:00:06 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 28 08:00:06 debiant systemd[1]: inetd.service: Killing process 17405 (inetd) with signal SIGABRT. Jul 28 08:00:08 debiant systemd-coredump[1974]: Process 17405 (inetd) of user 0 dumped core. Jul 28 08:00:08 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 28 08:00:08 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 28 08:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 28 08:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 5. Jul 28 08:00:08 debiant systemd[1]: Stopped Internet superserver. Jul 28 08:00:08 debiant systemd[1]: Starting Internet superserver... Jul 28 08:00:08 debiant systemd[1]: Started Internet superserver. Jul 28 16:00:07 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 28 16:00:07 debiant systemd[1]: inetd.service: Killing process 1983 (inetd) with signal SIGABRT. Jul 28 16:00:09 debiant systemd-coredump[22205]: Process 1983 (inetd) of user 0 dumped core. Jul 28 16:00:09 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 28 16:00:09 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 28 16:00:10 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 28 16:00:10 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 6. Jul 28 16:00:10 debiant systemd[1]: Stopped Internet superserver. Jul 28 16:00:10 debiant systemd[1]: Starting Internet superserver... Jul 28 16:00:10 debiant systemd[1]: Started Internet superserver. Jul 29 08:00:05 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 29 08:00:07 debiant systemd[1]: inetd.service: Killing process 22225 (inetd) with signal SIGABRT. Jul 29 08:00:09 debiant systemd-coredump[29276]: Process 22225 (inetd) of user 0 dumped core. Jul 29 08:00:09 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 29 08:00:09 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 29 08:00:09 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 29 08:00:09 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 7. Jul 29 08:00:09 debiant systemd[1]: Stopped Internet superserver. Jul 29 08:00:09 debiant systemd[1]: Starting Internet superserver... Jul 29 08:00:09 debiant systemd[1]: Started Internet superserver. Jul 29 14:00:05 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 29 14:00:05 debiant systemd[1]: inetd.service: Killing process 29285 (inetd) with signal SIGABRT. Jul 29 14:00:08 debiant systemd-coredump[1433]: Process 29285 (inetd) of user 0 dumped core. Jul 29 14:00:08 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 29 14:00:08 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 29 14:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 29 14:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 8. Jul 29 14:00:08 debiant systemd[1]: Stopped Internet superserver. Jul 29 14:00:08 debiant systemd[1]: Starting Internet superserver... Jul 29 14:00:09 debiant systemd[1]: Started Internet superserver. Jul 29 16:00:07 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 29 16:00:07 debiant systemd[1]: inetd.service: Killing process 1451 (inetd) with signal SIGABRT. Jul 29 16:00:08 debiant systemd-coredump[13872]: Process 1451 (inetd) of user 0 dumped core. Jul 29 16:00:08 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 29 16:00:08 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 29 16:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 29 16:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 9. Jul 29 16:00:08 debiant systemd[1]: Stopped Internet superserver. Jul 29 16:00:08 debiant systemd[1]: Starting Internet superserver... Jul 29 16:00:08 debiant systemd[1]: Started Internet superserver. Jul 30 10:00:05 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 30 10:00:05 debiant systemd[1]: inetd.service: Killing process 13894 (inetd) with signal SIGABRT. Jul 30 10:00:08 debiant systemd-coredump[10605]: Process 13894 (inetd) of user 0 dumped core. Jul 30 10:00:08 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 30 10:00:08 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 30 10:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 30 10:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 10. Jul 30 10:00:08 debiant systemd[1]: Stopped Internet superserver. Jul 30 10:00:08 debiant systemd[1]: Starting Internet superserver... Jul 30 10:00:09 debiant systemd[1]: Started Internet superserver. Jul 31 16:00:05 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Jul 31 16:00:05 debiant systemd[1]: inetd.service: Killing process 10620 (inetd) with signal SIGABRT. Jul 31 16:00:08 debiant systemd-coredump[21668]: Process 10620 (inetd) of user 0 dumped core. Jul 31 16:00:08 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Jul 31 16:00:08 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Jul 31 16:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Jul 31 16:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 11. Jul 31 16:00:08 debiant systemd[1]: Stopped Internet superserver. Jul 31 16:00:08 debiant systemd[1]: Starting Internet superserver... Jul 31 16:00:08 debiant systemd[1]: Started Internet superserver. Aug 01 00:00:07 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Aug 01 00:00:07 debiant systemd[1]: inetd.service: Killing process 21695 (inetd) with signal SIGABRT. Aug 01 00:00:10 debiant systemd-coredump[9766]: Process 21695 (inetd) of user 0 dumped core. Aug 01 00:00:10 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Aug 01 00:00:10 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Aug 01 00:00:10 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Aug 01 00:00:10 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 12. Aug 01 00:00:10 debiant systemd[1]: Stopped Internet superserver. Aug 01 00:00:10 debiant systemd[1]: Starting Internet superserver... Aug 01 00:00:10 debiant systemd[1]: Started Internet superserver. Aug 02 20:00:07 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Aug 02 20:00:07 debiant systemd[1]: inetd.service: Killing process 9800 (inetd) with signal SIGABRT. Aug 02 20:00:09 debiant systemd-coredump[7061]: Process 9800 (inetd) of user 0 dumped core. Aug 02 20:00:09 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Aug 02 20:00:09 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Aug 02 20:00:09 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Aug 02 20:00:09 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 13. Aug 02 20:00:09 debiant systemd[1]: Stopped Internet superserver. Aug 02 20:00:09 debiant systemd[1]: Starting Internet superserver... Aug 02 20:00:09 debiant systemd[1]: Started Internet superserver. Aug 03 22:00:05 debiant systemd[1]: inetd.service: Watchdog timeout (limit 5s)! Aug 03 22:00:05 debiant systemd[1]: inetd.service: Killing process 7078 (inetd) with signal SIGABRT. Aug 03 22:00:08 debiant systemd-coredump[15591]: Process 7078 (inetd) of user 0 dumped core. Aug 03 22:00:08 debiant systemd[1]: inetd.service: Main process exited, code=dumped, status=6/ABRT Aug 03 22:00:08 debiant systemd[1]: inetd.service: Failed with result 'watchdog'. Aug 03 22:00:08 debiant systemd[1]: inetd.service: Service RestartSec=100ms expired, scheduling restart. Aug 03 22:00:08 debiant systemd[1]: inetd.service: Scheduled restart job, restart counter is at 14. Aug 03 22:00:08 debiant systemd[1]: Stopped Internet superserver. Aug 03 22:00:08 debiant systemd[1]: Starting Internet superserver... Aug 03 22:00:08 debiant systemd[1]: Started Internet superserver.
