[Bug 1805183] Re: systemd-resolved constantly restarts on Bionic upgraded from Xenial

Wed Jun 5 01:33:15 UTC 2019

This bug was fixed in the package systemd - 240-6ubuntu9

---------------
systemd (240-6ubuntu9) eoan; urgency=medium

  * Fix typpo in storage test.
    File: debian/tests/storage
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=f28aa5fe4ab175b99b6ea702559c59ca473b4ca8

  * Fix bashism
    File: debian/extra/dhclient-enter-resolved-hook
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=0725c1169ddde4f41cacba7af3e546704e2206be

systemd (240-6ubuntu8) eoan; urgency=medium

  * Only restart resolved on changes in dhclient enter hook.
    This prevents spurious restarts of resolved on rebounds when
    the addresses did not change. (LP: #1805183)
    Author: Julian Andres Klode
    File: debian/extra/dhclient-enter-resolved-hook
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=258893bae8cbb12670e4807636fe8f7e9fb5407a

  * Wait for cryptsetup unit to start, before stopping.
    Patch from cascardo. Plus small refactor for readability. (LP: #1814373)
    File: debian/tests/storage
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=b65aa350be7e61c65927fbc0921a750fcfaa51cd

  * Wait for systemctl is-system-running state.
    File: debian/tests/boot-smoke
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=776998f1f55c445b6e385cab69a4219c42d00838

systemd (240-6ubuntu7) eoan; urgency=medium

  * Revert "Add check to switch VTs only between K_XLATE or K_UNICODE"
    This reverts commit 60407728a1a453104e3975ecfdf25a254dd7cc44.
    Files:
    - debian/patches/Add-check-to-switch-VTs-only-between-K_XLATE-or-K_UNICODE.patch
    - debian/patches/Move-verify_vc_kbmode-to-terminal-util.c-as-vt_verify_kbm.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=18029ab5ff436bfb3b401f24cd1e3a4cf2a1579c

  * Cherrypick missing systemd-stable patches to unbreak wireguard peer endpoints.
    Signed-off-by: Dimitri John Ledkov <xnox at ubuntu.com> (LP: #1825378)
    Author: Dan Streetman
    Files:
    - debian/patches/network-wireguard-fixes-sending-wireguard-peer-setti.patch
    - debian/patches/network-wireguard-use-sd_netlink_message_append_sock.patch
    - debian/patches/sd-netlink-introduce-sd_netlink_message_append_socka.patch
    - debian/patches/test-network-add-more-checks-in-NetworkdNetDevTests..patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=4046f515e40c4dc80d18d2303466737f1f451f11

  * Remove expected failure from passing test.
    Signed-off-by: Dimitri John Ledkov <xnox at ubuntu.com> (LP: #1829450)
    Author: Dan Streetman
    File: debian/tests/systemd-fsckd
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=c43b12037d08555dc1d26593307726d7c7992df0

  * Fix false negative checking for running jobs after boot.
    Signed-off-by: Dimitri John Ledkov <xnox at ubuntu.com> (LP: #1825997)
    Author: Dan Streetman
    File: debian/tests/boot-smoke
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=aeb01631efbaf3fe851dee15d496e0b66b5c347f

  * Cherrypick ask-password: prevent buffer overrow when reading from keyring.
    Signed-off-by: Dimitri John Ledkov <xnox at ubuntu.com> (LP: #1814373)
    Author: Dan Streetman
    File: debian/patches/ask-password-prevent-buffer-overrow-when-reading-fro.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=6d6e9cbd4fc6e018031a4762e88f2c3aa19e24e8

 -- Dimitri John Ledkov <xnox at ubuntu.com>  Thu, 30 May 2019 21:45:50
+0100

** Changed in: systemd (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1805183

Title:
  systemd-resolved constantly restarts on Bionic upgraded from Xenial

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  Confirmed
Status in systemd source package in Cosmic:
  Confirmed
Status in systemd source package in Disco:
  Confirmed

Bug description:
  [Impact]
  Log noise due to needless restart of resolved on lease expiry, maybe loss of cached state?

  [Test case]
  (1) Append make_resolv_conf to the end of the file, so it gets executed
  (2) Execute the file with bash -x and different settings and ensure there are no restarts if the settings are the same, and that there are if settings change; for example:

  sudo new_domain_name_servers=8.8.4.4 interface="wlp61s0" reason=REBIND bash -x debian/extra/dhclient-enter-resolved-hook
  sudo new_domain_name_servers=8.8.4.4 interface="wlp61s0" reason=REBIND bash -x debian/extra/dhclient-enter-resolved-hook
  => no restart
  sudo new_domain_name_servers=8.8.8.8 interface="wlp61s0" reason=REBIND bash -x debian/extra/dhclient-enter-resolved-hook
  => should restart
  sudo new_domain_name_servers=8.8.8.8 interface="wlp61s0" reason=REBIND bash -x debian/extra/dhclient-enter-resolved-hook
  => no restart
  sudo new_domain_name_servers=8.8.4.4 interface="wlp61s0" reason=REBIND bash -x debian/extra/dhclient-enter-resolved-hook
  => should restart

  [Regression potential]
  The change only restarts resolved when the settings change. If there's a bug in the logic, resolved might not be restarted when it should be. Also, since there will be less restarts of resolved, it will run longer, so if there are memory leaks they will become more apparent.

  [Original bug report]
  If a cloud server is upgraded from Xenial to Bionic, the dhclient system remains in place and any DHCP lease refreshes cause a needless restart of the system-resolved daemon

  Nov 26 16:59:41 srv-qvjhx dhclient[825]: DHCPREQUEST of 10.226.209.106 on ens3 to 10.226.209.105 port 67 (xid=0x2bd41d7d)
  Nov 26 16:59:41 srv-qvjhx dhclient[825]: DHCPACK of 10.226.209.106 from 10.226.209.105
  Nov 26 16:59:41 srv-qvjhx systemd[1]: Stopping Network Name Resolution...
  Nov 26 16:59:41 srv-qvjhx systemd[1]: Stopped Network Name Resolution.
  Nov 26 16:59:41 srv-qvjhx systemd[1]: Starting Network Name Resolution...
  Nov 26 16:59:41 srv-qvjhx systemd-resolved[1609]: Positive Trust Anchors:
  Nov 26 16:59:41 srv-qvjhx systemd-resolved[1609]: . IN DS 19036 8 2 49aac11d7b6f6446702e54a1607371607a1a41855200fd2ce1cdde32f24e8fb5
  Nov 26 16:59:41 srv-qvjhx systemd-resolved[1609]: . IN DS 20326 8 2 e06d44b80b8f1d39a95c0b0d7c65d08458e880409bbc683457104237c7f8ec8d
  Nov 26 16:59:41 srv-qvjhx systemd-resolved[1609]: Negative trust anchors: 10.in-addr.arpa 16.172.in-addr.arpa 17.172.in-addr.arpa 18.172.in-addr.arpa 1
  Nov 26 16:59:41 srv-qvjhx systemd-resolved[1609]: Using system hostname 'srv-qvjhx'.
  Nov 26 16:59:41 srv-qvjhx systemd[1]: Started Network Name Resolution.
  Nov 26 16:59:41 srv-qvjhx systemd[1]: Starting resolvconf-pull-resolved.service...
  Nov 26 16:59:41 srv-qvjhx dhclient[825]: bound to 10.226.209.106 -- renewal in 1466 seconds.
  Nov 26 16:59:41 srv-qvjhx systemd[1]: Started resolvconf-pull-resolved.service.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-139.165-generic 4.4.160
  Uname: Linux 4.4.0-139-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Nov 26 16:17:52 2018
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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