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

[Tyler Hicks]

@xnox you previously mentioned that you had some systemd SRUs to
prepare. Feel free to include this fix in those SRUs to address the
error tracker reports. It just doesn't quite make sense to do a
standalone security update of the init daemon for a low priority
security issue.

This bug is an interesting corner case of not being quite important
enough to warrant a security update yet being enough of an annoyance
that it warrants an SRU. My apologies for not noticing this fact
earlier.

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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:
  Confirmed
Status in systemd source package in Yakkety:
  Confirmed
Status in systemd source package in Zesty:
  Confirmed

Bug description:
  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

  [Testcase]
  Notice the dropoff rate of the crash report on errors:

  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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