Here's one of the new coredumps I'm getting at boot now. Note that I don't have 
debugging symbols installed for the PPA version of systemd.
# coredumpctl gdb 714
           PID: 714 (systemd-network)
           UID: 100 (systemd-network)
           GID: 102 (systemd-network)
        Signal: 11 (SEGV)
     Timestamp: Wed 2020-07-08 17:17:01 UTC (8min ago)
  Command Line: /lib/systemd/systemd-networkd
    Executable: /lib/systemd/systemd-networkd
 Control Group: /system.slice/systemd-networkd.service
          Unit: systemd-networkd.service
         Slice: system.slice
       Boot ID: df33bbaec4134b45aaabe8b3fca7dade
    Machine ID: ec267b3475883f9edb99f554607bb456
      Hostname: ip-10-0-4-251
       Storage: 
/var/lib/systemd/coredump/core.systemd-network.100.df33bbaec4134b45aaabe8b3fca7dade.714.1594228621000000.lz4
       Message: Process 714 (systemd-network) of user 100 dumped core.
                
                Stack trace of thread 714:
                #0  0x00005627a7f3425c n/a (systemd-networkd)
                #1  0x00005627a7fb5760 n/a (systemd-networkd)
                #2  0x00005627a7f26526 sd_netlink_process (systemd-networkd)
                #3  0x00005627a7f267c3 n/a (systemd-networkd)
                #4  0x00005627a7f2b6be n/a (systemd-networkd)
                #5  0x00005627a7f2b93a sd_event_dispatch (systemd-networkd)
                #6  0x00005627a7f2bac9 sd_event_run (systemd-networkd)
                #7  0x00005627a7f2bd0b sd_event_loop (systemd-networkd)
                #8  0x00005627a7eff3d6 n/a (systemd-networkd)
                #9  0x00007f6d90500b97 __libc_start_main (libc.so.6)
                #10 0x00005627a7effaba n/a (systemd-networkd)


** Attachment added: 
"core.systemd-network.100.df33bbaec4134b45aaabe8b3fca7dade.714.1594228621000000.lz4"
   
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1881972/+attachment/5390826/+files/core.systemd-network.100.df33bbaec4134b45aaabe8b3fca7dade.714.1594228621000000.lz4

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

Title:
  systemd-networkd crashes with invalid pointer

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