Public bug reported:

Several days ago an ubuntu 18.04 in ec2 env updated systemd and udev to 
237-3ubuntu10.31
This caused systemd to segfault and stop receiving any systemctl command (they 
timeout).

[  198.482652] systemd[1]: segfault at 50 ip 00005630ddd60200 sp 
00007ffc9c3ea890 error 4 in systemd (deleted)[5630ddcc1000+14e000]
[  278.664729] systemd-journald[451]: Failed to send WATCHDOG=1 notification 
message: Connection refused
[  368.462136] systemd-journald[451]: Failed to send WATCHDOG=1 notification 
message: Transport endpoint is not connected
[  458.496689] systemd-journald[451]: Failed to send WATCHDOG=1 notification 
message: Transport endpoint is not connected

I downgraded to 237-3ubuntu10.29 to no avail.
Then I downgraded to 237-3ubuntu10:
apt install udev=237-3ubuntu10 systemd=237-3ubuntu10 systemd-sysv=237-3ubuntu10 
libsystemd0:amd64=237-3ubuntu10 libudev1:amd64=237-3ubuntu10 
libnss-systemd:amd64=237-3ubuntu10

and that did not help either.
The machine is unusable at the moment.

Attaching coredump of systemd (version 237-3ubuntu10.31)

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1852903

Title:
  systemd Caught <SEGV>, dumped core

Status in systemd package in Ubuntu:
  New

Bug description:
  Several days ago an ubuntu 18.04 in ec2 env updated systemd and udev to 
237-3ubuntu10.31
  This caused systemd to segfault and stop receiving any systemctl command 
(they timeout).

  [  198.482652] systemd[1]: segfault at 50 ip 00005630ddd60200 sp 
00007ffc9c3ea890 error 4 in systemd (deleted)[5630ddcc1000+14e000]
  [  278.664729] systemd-journald[451]: Failed to send WATCHDOG=1 notification 
message: Connection refused
  [  368.462136] systemd-journald[451]: Failed to send WATCHDOG=1 notification 
message: Transport endpoint is not connected
  [  458.496689] systemd-journald[451]: Failed to send WATCHDOG=1 notification 
message: Transport endpoint is not connected

  I downgraded to 237-3ubuntu10.29 to no avail.
  Then I downgraded to 237-3ubuntu10:
  apt install udev=237-3ubuntu10 systemd=237-3ubuntu10 
systemd-sysv=237-3ubuntu10 libsystemd0:amd64=237-3ubuntu10 
libudev1:amd64=237-3ubuntu10 libnss-systemd:amd64=237-3ubuntu10

  and that did not help either.
  The machine is unusable at the moment.

  Attaching coredump of systemd (version 237-3ubuntu10.31)

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