[Bug 1621396] Re: systemd-resolved crashed with SIGSEGV in dns_packet_is_reply_for()

[Adam Conrad]

Hello Daniele, or anyone else affected,

Accepted systemd into xenial-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/systemd/229-4ubuntu19
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 and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, details of your
testing will help us make a better decision.

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

** Tags removed: verification-failed-xenial
** Tags added: verification-needed verification-needed-xenial

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https://bugs.launchpad.net/bugs/1621396

Title:
  systemd-resolved crashed with SIGSEGV in dns_packet_is_reply_for()

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed
Status in systemd source package in Yakkety:
  In Progress
Status in systemd source package in Zesty:
  Fix Released

Bug description:
  [Impact]

   * Null-pointer dereference in resolved, results in resolved crash and
  reports on launchpad and errors.

  [Test Case]

   * Unknown steps to reproduce
   * Monitor the drop off in crashes on errors.ubuntu.com:
  https://errors.ubuntu.com/problem/ea90aefe098653f44b46e56d72e2cc05ff980465

  [Regression Potential]

   * The behavior is similar, instead of crashing resolved it returns an
  error in the relevant function. Whilst this may not result in correct
  dns resolution for the affected dns packets, it should not result in
  resolved crashes.

  [Original Bug Report]

  This is one of background errors that happens without any active app being involved.
  For the records, I had open: Firefox, Slack, Franz and the Terminal

  The Ubuntu Error Tracker has been receiving reports about a problem regarding systemd. This problem was most recently seen with package version 233-6ubuntu2, the problem page at https://errors.ubuntu.com/problem/ea90aefe098653f44b46e56d72e2cc05ff980465 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.

  ProblemType: Crash
  DistroRelease: Ubuntu 16.10
  Package: systemd 231-5
  ProcVersionSignature: Ubuntu 4.4.0-9136.55-generic 4.4.16
  Uname: Linux 4.4.0-9136-generic x86_64
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
  CrashCounter: 1
  Date: Thu Sep  8 09:33:55 2016
  ExecutablePath: /lib/systemd/systemd-resolved
  InstallationDate: Installed on 2013-06-06 (1189 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Dell Inc. Dell System XPS L322X
  ProcCmdline: /lib/systemd/systemd-resolved
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-9136-generic root=UUID=2850be62-a05e-4ab9-af2b-5f1fd159ce5d ro quiet splash vt.handoff=7
  Signal: 11
  SourcePackage: systemd
  StacktraceTop:
   ?? ()
   ?? ()
   ?? () from /lib/systemd/libsystemd-shared-231.so
   sd_event_dispatch () from /lib/systemd/libsystemd-shared-231.so
   sd_event_run () from /lib/systemd/libsystemd-shared-231.so
  Title: systemd-resolved crashed with SIGSEGV in sd_event_dispatch()
  UpgradeStatus: Upgraded to yakkety on 2016-09-03 (4 days ago)
  UserGroups:

  dmi.bios.date: 04/18/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: 0PJHXN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd04/18/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L322X
  dmi.sys.vendor: Dell Inc.

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