This bug was fixed in the package xe-guest-utilities -
6.2.0-1120+dsf1-0ubuntu4
---------------
xe-guest-utilities (6.2.0-1120+dsf1-0ubuntu4) zesty; urgency=medium
* debian/xe-guest-utilities.xe-daemon.service: declare
DefaultDependencies=no to prevent dependency cycles. The unit cannot
be simultaniously before and after sysinit target. By default all
units are after sysinit target, yet cloud-init-local is before it. LP:
#1669755
-- Dimitri John Ledkov <[email protected]> Fri, 03 Mar 2017 12:33:01
+0000
** Changed in: xe-guest-utilities (Ubuntu Zesty)
Status: Fix Committed => Fix Released
--
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https://bugs.launchpad.net/bugs/1669755
Title:
Circular boot dependency cycle with cloud-init et.al.
Status in xe-guest-utilities package in Ubuntu:
Fix Released
Status in xe-guest-utilities source package in Xenial:
Triaged
Status in xe-guest-utilities source package in Yakkety:
Triaged
Status in xe-guest-utilities source package in Zesty:
Fix Released
Bug description:
[Impact]
* xe-deamon.service tries to be an early boot unit; before cloud-init-local
/ networking is setup
* However it does not declare DefaultDependencies=no, and thus tries to pull
in sysinit.target which should happen after cloud-init-local; yet
xe-daemon.service is declared to be before cloud-init-local, thus this is a
conflict of interest.
* xe-deamon should declare DefaultDependencies=no
= Current unit =
[Unit]
Description=Xen Guest Monitoring Agent
After=local-fs.target
Requires=proc-xen.mount
Before=network.target cloud-init.service cloud-init-local.service
ConditionVirtualization=xen
ConditionPathExists=/proc/xen/capabilities
[Service]
ExecStartPre=/usr/sbin/xe-linux-distribution /var/cache/xe-linux-distribution
ExecStart=/usr/sbin/xe-daemon
StandardOutput=journal+console
[Install]
WantedBy=multi-user.target
= Proposed fix =
--- xe-guest-utilities.xe-daemon.service.old 2017-03-03 11:45:48.679700766
+0000
+++ xe-guest-utilities.xe-daemon.service 2017-03-03 11:46:07.923549054
+0000
@@ -1,5 +1,6 @@
[Unit]
Description=Xen Guest Monitoring Agent
+DefaultDependencies=no
After=local-fs.target
Requires=proc-xen.mount
Before=network.target cloud-init.service cloud-init-local.service
==
[Test Case]
* Boot a cloud instance, with xen hypervisor and cloud-init metdata
* There should be no boot cycles
[Regression Potential]
* Minimal, currently xe-daemon.service creates dependency cycles
which prevent reliable and reproducible boots.
[Other Info]
* Related bug #1496730
[Dependency cycle]
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found ordering cycle on
basic.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
sockets.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
snapd.socket/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
sysinit.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
cloud-init.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
cloud-init-local.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
xe-daemon.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
basic.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Breaking ordering cycle by
deleting job sockets.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: sockets.target: Job sockets.target/start
deleted to break ordering cycle starting with basic.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found ordering cycle on
basic.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
sysinit.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
cloud-init.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
cloud-init-local.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
xe-daemon.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
basic.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Breaking ordering cycle by
deleting job cloud-init.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: cloud-init.service: Job
cloud-init.service/start deleted to break ordering cycle starting with
basic.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found ordering cycle on
basic.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
sysinit.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
cloud-init-local.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
xe-daemon.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Found dependency on
basic.target/start
Mar 03 12:01:15 slmeta1 systemd[1]: basic.target: Breaking ordering cycle by
deleting job cloud-init-local.service/start
Mar 03 12:01:15 slmeta1 systemd[1]: cloud-init-local.service: Job
cloud-init-local.service/start deleted to break ordering cycle starting with
basic.target/start
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