I suggest setting this bug Won't Fix.

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https://bugs.launchpad.net/bugs/1696970

Title:
  softlockup DoS causes systemd-journald.service to abort with SIGABORT

Status in systemd package in Ubuntu:
  Opinion
Status in systemd source package in Artful:
  Opinion

Bug description:
  I was running the new stress-ng softlockup stressor and observed that
  systemd-journald gets killed with an abort and this corrupts the
  systemd journal.

  How to reproduce:

  git clone git://kernel.ubuntu.com/cking/stress-ng
  cd stress-ng
  make clean; make

  sudo ./stress-ng --softlockup 0 -t 360 -v

  ..and wait for 360 seconds.  dmesg shows the following, 100%
  reproduceable:

  
  [  875.310331] systemd[1]: systemd-timesyncd.service: Watchdog timeout (limit 
3min)!
  [  875.310740] systemd[1]: systemd-timesyncd.service: Killing process 574 
(systemd-timesyn) with signal SIGABRT.
  [  875.327289] systemd[1]: systemd-timesyncd.service: Main process exited, 
code=killed, status=6/ABRT
  [  875.327666] systemd[1]: systemd-timesyncd.service: Unit entered failed 
state.
  [  875.327686] systemd[1]: systemd-timesyncd.service: Failed with result 
'watchdog'.
  [  875.327917] systemd[1]: systemd-timesyncd.service: Service has no hold-off 
time, scheduling restart.
  [  875.327954] systemd[1]: Stopped Network Time Synchronization.
  [  875.328845] systemd[1]: Starting Network Time Synchronization...
  [  875.525071] systemd[1]: Started Network Time Synchronization.
  [  875.539619] systemd[1]: systemd-journald.service: Main process exited, 
code=dumped, status=6/ABRT
  [  875.544257] systemd-journald[5214]: File 
/run/log/journal/440e485e550040e3b93b66b2faae8525/system.journal corrupted or 
uncleanly shut down, renaming and replacing.

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