Hello Naveen, or anyone else affected,

Accepted systemd into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/245.4-4ubuntu3.22 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: systemd (Ubuntu Focal)
       Status: Triaged => Fix Committed

** Tags added: verification-needed verification-needed-focal

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/2012943

Title:
  systemd-resolved crashes due to use-after-free bug

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Fix Committed

Bug description:
  [ Impact ]

  The continuous systemd-resolved crashes delay/hang the device startup.
  And this leads to unresponsive devices in the system. Specifically, the crash 
looks like:

  Dec 16 12:51:21 TREND-24-AF-7A systemd[1]: Started Time & Date Service.
  Dec 16 12:51:24 TREND-24-AF-7A systemd[1]: systemd-resolved.service: Main 
process exited, code=killed, status=11/SEGV
  [...]
  Dec 16 12:53:47 TREND-24-AF-7A systemd-resolved[2591]: Assertion 
'DNS_TRANSACTION_IS_LIVE(q->state)' failed at 
src/resolve/resolved-dns-query.c:520, function dns_query_complete(). Aborting.
  Dec 16 12:53:47 TREND-24-AF-7A systemd[1]: systemd-resolved.service: Main 
process exited, code=killed, status=6/ABRT

  [ Test Plan ]

  The exact steps to reproduce this issue are still not known.
  But we see this crash only in Static IP Addressing mode enabled, where 
systemd-resolved is enabled for LLMNR service.
  But we were not able to see this crash in DHCP mode.

  Steps to reproduce:
  1) Powercycle the device.
  2) Soft-reboot.

  It was also pointed out by Brian Murray that this error in the Ubuntu
  error tracker is likely the same bug:
  https://errors.ubuntu.com/problem/3cb08ae5efaa4d8c6ce992f7cebd2751ae3f168f.
  Therefore, we would expect to stop seeing this error in the tracker as
  a result of this patch.

  [ Where problems could occur ]

  The patch[1] simply disables the timer event source for a DNS query
  when the struct representing that query is free'd. I cannot see any
  realistic regression potential, because if the timer event fired on
  the DNS query after it has been free'd, then that would be this bug.
  I.e. no working code should be relying on the timer event source still
  being around after the query is free'd.

  [1]
  
https://github.com/systemd/systemd/commit/73bfd7be042cc63e7649242b377ad494bf74ea4b

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