Public bug reported:
I launched a new instance on azure and noticed that it had 'uptime' of 8 days.
Debugging a bit with Odd_Bloke in #cloud-init, it certainly seems that it is
around the time when timesync ran:
$ journalctl -o short-monotonic -u systemd-timesyncd.service
--no-pager
-- Logs begin at Sun 2020-05-17 17:02:46 UTC, end at Tue 2020-05-26 14:25:13
UTC. --
[ 9.538593] ubuntu systemd[1]: Starting Network Time Synchronization...
[ 9.962555] ubuntu systemd[1]: Started Network Time Synchronization.
[766221.957145] smoser00 systemd-timesyncd[725]: Network configuration change
d, trying to establish connection.
[766222.048914] smoser00 systemd-timesyncd[725]: Network configuration change
d, trying to establish connection.
[766223.170150] smoser00 systemd-timesyncd[725]: Network configuration change
d, trying to establish connection.
[766223.266062] smoser00 systemd-timesyncd[725]: Synchronized to time server
91.189.91.157:123 (ntp.ubuntu.com).
I did not expect 'uptime' to be affected by ntpd fixes.
I guess it is possible that I benefited from the "pre-provisioning" on
azure, but that seems unlikely as this account has probably run 5 ubuntu
instances for a total of maybe a week over the last year. So it would
seem a poor candidate for such a thing, or a really good prediction
algorithm. If its the latter, then kudos to Microsoft for guessing that
I was going to launch an instance today.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: cloud-init 19.4-33-gbb4131a2-0ubuntu1~18.04.1
ProcVersionSignature: Ubuntu 5.3.0-1020.21~18.04.1-azure 5.3.18
Uname: Linux 5.3.0-1020-azure x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CloudName: Azure
Date: Tue May 26 14:24:41 2020
PackageArchitecture: all
ProcEnviron:
TERM=screen.xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: cloud-init
UpgradeStatus: No upgrade log present (probably fresh install)
user_data.txt:
** Affects: cloud-init (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic uec-images
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https://bugs.launchpad.net/bugs/1880704
Title:
jump in kernel clock during boot on azure
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