[Bug 1696970] Re: softlockup DoS causes systemd-journald.service to abort with SIGABORT

[Balint Reczey]

@xnox IMO watchdogs should not care if it is a "soft" or other kind of
lockup.

I'm closing the bug because the workaround for recovering from a
potentially broken journal is working and there is no indication of a
journal which is actually broken.


** Changed in: systemd (Ubuntu Artful)
       Status: Incomplete => Opinion

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to systemd in Ubuntu.
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1696970/+subscriptions