TL;DR

The NTP Code around this is simplified:
1. Complex thing eventually setting ret to next element
2. assert ret!=NULL  <-- this is what our bug reports hit

"Complex thing" was completely rewritten in the referred patch set to
close the race window that it had.

So no matter these NTP bugs refer to slightly other ways of this issue
to surface it is very likely the same "race".

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to ntp in Ubuntu.
https://bugs.launchpad.net/bugs/1567540

Title:
  ntpd crashed with SIGABRT (was: ntp crashes everytime the network goes
  up or down.)

Status in NTP:
  Fix Released
Status in ntp package in Ubuntu:
  Triaged

Bug description:
  ntp crashes every time the network goes up or down while the system is 
running and also crashes after booting up without network.
  --- 
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-03-12 (26 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
  NtpStatus: ntpq: read: Connection refused
  Package: ntp 1:4.2.8p4+dfsg-3ubuntu4
  PackageArchitecture: amd64
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-17-generic 
root=UUID=306314bc-efcb-4c2d-b0e9-e05ec92ed0f0 ro
  ProcVersionSignature: Ubuntu 4.4.0-17.33-generic 4.4.6
  Tags:  xenial
  Uname: Linux 4.4.0-17-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  --- 
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-03-12 (31 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160224)
  NtpStatus: ntpq: read: Connection refused
  Package: ntp 1:4.2.8p4+dfsg-3ubuntu5
  PackageArchitecture: amd64
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-18-generic 
root=UUID=306314bc-efcb-4c2d-b0e9-e05ec92ed0f0 ro
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Tags:  xenial
  Uname: Linux 4.4.0-18-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  --- 
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-04-13 (0 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160412)
  NtpStatus: ntpq: read: Connection refused
  Package: ntp 1:4.2.8p4+dfsg-3ubuntu5
  PackageArchitecture: amd64
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-18-generic 
root=UUID=13f57794-2e19-4a56-836a-94185bba5ec5 ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Tags:  xenial
  Uname: Linux 4.4.0-18-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  --- 
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-04-13 (0 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160412)
  NtpStatus: ntpq: read: Connection refused
  Package: ntp 1:4.2.8p4+dfsg-3ubuntu5
  PackageArchitecture: amd64
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-18-generic 
root=UUID=13f57794-2e19-4a56-836a-94185bba5ec5 ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Tags:  xenial
  Uname: Linux 4.4.0-18-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  --- 
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-04-14 (3 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160412)
  NtpStatus: ntpq: read: Connection refused
  Package: ntp 1:4.2.8p4+dfsg-3ubuntu5
  PackageArchitecture: amd64
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-20-generic 
root=UUID=b9c0528f-e81f-4b08-9b31-032f14f72ccd ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-20.36-generic 4.4.6
  Tags:  xenial
  Uname: Linux 4.4.0-20-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  --- 
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-04-14 (3 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160412)
  NtpStatus: ntpq: read: Connection refused
  Package: ntp 1:4.2.8p4+dfsg-3ubuntu5
  PackageArchitecture: amd64
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-20-generic 
root=UUID=b9c0528f-e81f-4b08-9b31-032f14f72ccd ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-20.36-generic 4.4.6
  Tags:  xenial
  Uname: Linux 4.4.0-20-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-04-14 (63 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160412)
  NtpStatus: ntpq: read: Connection refused
  Package: ntp 1:4.2.8p4+dfsg-3ubuntu5
  PackageArchitecture: amd64
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-25-generic 
root=UUID=3aea4570-4011-4247-9636-68317385324d ro
  ProcVersionSignature: Ubuntu 4.4.0-25.44-generic 4.4.13
  Tags: xenial third-party-packages
  Uname: Linux 4.4.0-25-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin mail netdev plugdev sambashare sudo
  _MarkForUpload: True

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