# journalctl -l -u systemd-networkd
-- Logs begin at Wed 2020-06-03 15:00:29 UTC, end at Wed 2020-06-03 21:23:27 UTC. --
Jun 03 15:00:31 ip-10-0-4-251 systemd[1]: Starting Network Service...
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: Enumeration completed
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: ens5: Link UP
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: ens5: Gained carrier
Jun 03 15:00:31 ip-10-0-4-251 systemd[1]: Started Network Service.
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: ens5: Link DOWN
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: ens5: Lost carrier
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: ens5: IPv6 successfully enabled
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: ens7: Link is not managed by us
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: lo: Link is not managed by us
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: ens6: Link is not managed by us
Jun 03 15:00:31 ip-10-0-4-251 systemd-networkd[599]: ens5: Link UP
Jun 03 15:00:32 ip-10-0-4-251 systemd-networkd[599]: ens5: Gained carrier
Jun 03 15:00:32 ip-10-0-4-251 systemd-networkd[599]: ens5: DHCPv4 address 10.0.4.251/28 via 10.0.4.241
Jun 03 15:00:32 ip-10-0-4-251 systemd-networkd[599]: Not connected to system bus, not setting hostname.
Jun 03 15:00:33 ip-10-0-4-251 systemd-networkd[599]: ens5: Gained IPv6LL
Jun 03 15:00:33 ip-10-0-4-251 systemd-networkd[599]: ens5: Configured
Jun 03 15:02:49 ip-10-0-4-251 systemd-networkd[599]: docker0: Link UP
Jun 03 15:02:54 ip-10-0-4-251 systemd[1]: Stopping Network Service...
Jun 03 15:02:54 ip-10-0-4-251 systemd[1]: Stopped Network Service.
Jun 03 15:02:54 ip-10-0-4-251 systemd[1]: Starting Network Service...
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens5: Gained IPv6LL
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: Enumeration completed
Jun 03 15:02:54 ip-10-0-4-251 systemd[1]: Started Network Service.
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens7: IPv6 successfully enabled
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: lo: Link is not managed by us
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens6: Link is not managed by us
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: docker0: Link is not managed by us
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens5: Link is not managed by us
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens6: IPv6 successfully enabled
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: lo: Link is not managed by us
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: docker0: Link is not managed by us
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens5: Link is not managed by us
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens5: IPv6 successfully enabled
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: lo: Link is not managed by us
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: docker0: Link is not managed by us
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens7: Link UP
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens7: Gained carrier
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens5: DHCPv4 address 10.0.4.251/28 via 10.0.4.241
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens6: Link UP
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens6: Gained carrier
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens7: DHCPv4 address 10.0.2.245/24 via 10.0.2.1
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens6: DHCPv4 address 10.0.3.171/24 via 10.0.3.1
Jun 03 15:02:54 ip-10-0-4-251 systemd-networkd[30803]: ens5: Configured
Jun 03 15:02:55 ip-10-0-4-251 systemd-networkd[30803]: ens7: Gained IPv6LL
Jun 03 15:02:55 ip-10-0-4-251 systemd-networkd[30803]: ens7: Configured
Jun 03 15:02:55 ip-10-0-4-251 systemd-networkd[30803]: ens6: Gained IPv6LL
Jun 03 15:02:55 ip-10-0-4-251 systemd-networkd[30803]: ens6: Configured

The above is all normal for how the system is booted and configured. Everything below here happens with no admin or user changes at all:

Jun 03 15:32:53 ip-10-0-4-251 systemd-networkd[30803]: ens6: Configured
Jun 03 15:32:54 ip-10-0-4-251 systemd-networkd[30803]: ens5: Configured
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[30803]: ens7: Configured
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[30803]: munmap_chunk(): invalid pointer
Jun 03 15:55:22 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Main process exited, code=dumped, status=6/ABRT
Jun 03 15:55:22 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Failed with result 'core-dump'.
Jun 03 15:55:22 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Service has no hold-off time, scheduling restart.
Jun 03 15:55:22 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Scheduled restart job, restart counter is at 1.
Jun 03 15:55:22 ip-10-0-4-251 systemd[1]: Stopped Network Service.
Jun 03 15:55:22 ip-10-0-4-251 systemd[1]: Starting Network Service...
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens7: Gained IPv6LL
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens6: Gained IPv6LL
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens5: Gained IPv6LL
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: Enumeration completed
Jun 03 15:55:22 ip-10-0-4-251 systemd[1]: Started Network Service.
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens7: IPv6 successfully enabled
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: docker0: Link is not managed by us
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: lo: Link is not managed by us
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens6: IPv6 successfully enabled
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: docker0: Link is not managed by us
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: lo: Link is not managed by us
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens5: IPv6 successfully enabled
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: docker0: Link is not managed by us
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: lo: Link is not managed by us
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens7: DHCPv4 address 10.0.2.245/24 via 10.0.2.1
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens6: DHCPv4 address 10.0.3.171/24 via 10.0.3.1
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens5: DHCPv4 address 10.0.4.251/28 via 10.0.4.241
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens7: Configured
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens6: Configured
Jun 03 15:55:22 ip-10-0-4-251 systemd-networkd[7263]: ens5: Configured
Jun 03 16:25:21 ip-10-0-4-251 systemd-networkd[7263]: ens5: Configured
Jun 03 16:25:23 ip-10-0-4-251 systemd-networkd[7263]: ens6: Configured
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[7263]: ens7: Configured
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[7263]: munmap_chunk(): invalid pointer
Jun 03 16:47:50 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Main process exited, code=dumped, status=6/ABRT
Jun 03 16:47:50 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Failed with result 'core-dump'.
Jun 03 16:47:50 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Service has no hold-off time, scheduling restart.
Jun 03 16:47:50 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Scheduled restart job, restart counter is at 2.
Jun 03 16:47:50 ip-10-0-4-251 systemd[1]: Stopped Network Service.
Jun 03 16:47:50 ip-10-0-4-251 systemd[1]: Starting Network Service...
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens7: Gained IPv6LL
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens6: Gained IPv6LL
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens5: Gained IPv6LL
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: Enumeration completed
Jun 03 16:47:50 ip-10-0-4-251 systemd[1]: Started Network Service.
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens7: IPv6 successfully enabled
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: docker0: Link is not managed by us
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: lo: Link is not managed by us
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens6: IPv6 successfully enabled
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: docker0: Link is not managed by us
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: lo: Link is not managed by us
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens5: IPv6 successfully enabled
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: docker0: Link is not managed by us
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: lo: Link is not managed by us
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens7: DHCPv4 address 10.0.2.245/24 via 10.0.2.1
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens6: DHCPv4 address 10.0.3.171/24 via 10.0.3.1
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens5: DHCPv4 address 10.0.4.251/28 via 10.0.4.241
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens7: Configured
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens6: Configured
Jun 03 16:47:50 ip-10-0-4-251 systemd-networkd[15948]: ens5: Configured
Jun 03 17:17:49 ip-10-0-4-251 systemd-networkd[15948]: ens6: Configured
Jun 03 17:17:51 ip-10-0-4-251 systemd-networkd[15948]: ens5: Configured
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[15948]: ens7: Configured
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[15948]: munmap_chunk(): invalid pointer
Jun 03 17:40:18 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Main process exited, code=dumped, status=6/ABRT
Jun 03 17:40:18 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Failed with result 'core-dump'.
Jun 03 17:40:18 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Service has no hold-off time, scheduling restart.
Jun 03 17:40:18 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Scheduled restart job, restart counter is at 3.
Jun 03 17:40:18 ip-10-0-4-251 systemd[1]: Stopped Network Service.
Jun 03 17:40:18 ip-10-0-4-251 systemd[1]: Starting Network Service...
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens7: Gained IPv6LL
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens6: Gained IPv6LL
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens5: Gained IPv6LL
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: Enumeration completed
Jun 03 17:40:18 ip-10-0-4-251 systemd[1]: Started Network Service.
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens7: IPv6 successfully enabled
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: docker0: Link is not managed by us
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: lo: Link is not managed by us
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens6: IPv6 successfully enabled
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: docker0: Link is not managed by us
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: lo: Link is not managed by us
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens5: IPv6 successfully enabled
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: docker0: Link is not managed by us
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: lo: Link is not managed by us
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens7: DHCPv4 address 10.0.2.245/24 via 10.0.2.1
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens6: DHCPv4 address 10.0.3.171/24 via 10.0.3.1
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens5: DHCPv4 address 10.0.4.251/28 via 10.0.4.241
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens7: Configured
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens6: Configured
Jun 03 17:40:18 ip-10-0-4-251 systemd-networkd[24672]: ens5: Configured
Jun 03 18:10:19 ip-10-0-4-251 systemd-networkd[24672]: ens6: Configured
Jun 03 18:10:19 ip-10-0-4-251 systemd-networkd[24672]: ens5: Configured
Jun 03 18:32:46 ip-10-0-4-251 systemd-networkd[24672]: ens7: Configured
Jun 03 18:32:46 ip-10-0-4-251 systemd-networkd[24672]: munmap_chunk(): invalid pointer
Jun 03 18:32:46 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Main process exited, code=dumped, status=6/ABRT
Jun 03 18:32:46 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Failed with result 'core-dump'.
Jun 03 18:32:46 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Service has no hold-off time, scheduling restart.
Jun 03 18:32:46 ip-10-0-4-251 systemd[1]: systemd-networkd.service: Scheduled restart job, restart counter is at 4.
Jun 03 18:32:46 ip-10-0-4-251 systemd[1]: Stopped Network Service.
Jun 03 18:32:46 ip-10-0-4-251 systemd[1]: Starting Network Service...
Jun 03 18:32:46 ip-10-0-4-251 systemd-networkd[969]: ens7: Gained IPv6LL
Jun 03 18:32:46 ip-10-0-4-251 systemd-networkd[969]: ens6: Gained IPv6LL
Jun 03 18:32:46 ip-10-0-4-251 systemd-networkd[969]: ens5: Gained IPv6LL
Jun 03 18:32:46 ip-10-0-4-251 systemd-networkd[969]: Enumeration completed
Jun 03 18:32:46 ip-10-0-4-251 systemd[1]: Started Network Service.
Jun 03 18:32:46 ip-10-0-4-251 systemd-networkd[969]: ens7: IPv6 successfully enabled
Jun 03 18:32:46 ip-10-0-4-251 systemd-networkd[969]: lo: Link is not managed by us