the reproducer from description causes the coredump rather easily on
bionic:

ubuntu@lp1881972-b:~$ dpkg -l systemd|grep systemd
ii  systemd        237-3ubuntu10.41 amd64        system and service manager

from journal:
Jul 30 17:49:08 lp1881972-b systemd-networkd[705]: munmap_chunk(): invalid 
pointer
Jul 30 17:49:08 lp1881972-b systemd[1]: systemd-networkd.service: Main process 
exited, code=dumped, status=6/ABRT
Jul 30 17:49:08 lp1881972-b systemd[1]: systemd-networkd.service: Failed with 
result 'core-dump'.


after upgrading:

ubuntu@lp1881972-b:~$ dpkg -l systemd|grep systemd
ii  systemd        237-3ubuntu10.42 amd64        system and service manager

many lease renewals:
ubuntu@lp1881972-b:~$ journalctl -b | grep Configured
Jul 30 17:58:39 lp1881972-b systemd[1]: Starting Wait for Network to be 
Configured...
Jul 30 17:58:40 lp1881972-b systemd-networkd[712]: ens3: Configured
Jul 30 17:58:40 lp1881972-b systemd[1]: Started Wait for Network to be 
Configured.
Jul 30 17:59:36 lp1881972-b systemd-networkd[712]: ens3: Configured
Jul 30 18:00:29 lp1881972-b systemd-networkd[712]: ens3: Configured
Jul 30 18:01:24 lp1881972-b systemd-networkd[712]: ens3: Configured
Jul 30 18:02:16 lp1881972-b systemd-networkd[712]: ens3: Configured
Jul 30 18:03:09 lp1881972-b systemd-networkd[712]: ens3: Configured
Jul 30 18:04:03 lp1881972-b systemd-networkd[712]: ens3: Configured
Jul 30 18:04:57 lp1881972-b systemd-networkd[712]: ens3: Configured

no core dumps:
ubuntu@lp1881972-b:~$ journalctl -b | grep core-dump
ubuntu@lp1881972-b:~$ 


** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic

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https://bugs.launchpad.net/bugs/1881972

Title:
  systemd-networkd crashes with invalid pointer

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