This bug was fixed in the package dbus - 1.12.20-2ubuntu2
---------------
dbus (1.12.20-2ubuntu2) impish; urgency=medium
* Rework d/p/ubuntu/dont-stop-dbus.patch to avoid a deadlock during boot
(LP: #1936948)
-- Lukas Märdian <sl...@ubuntu.com> Thu, 09 Sep 2021 15:45:30 +0200
** Changed in: dbus (Ubuntu Impish)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1936948
Title:
Dependency loop via sockets.target
Status in dbus package in Ubuntu:
Fix Released
Status in dbus source package in Impish:
Fix Released
Bug description:
basic.target waits for dbus.socket (via sockets.target) AND
dbus.socket waits for basic.target, too, delaying dbus-daemon startup.
At some point a timeout happens, dbus is started and all queued
services try to start registering to the bus at the same time.
All services registering at the same time, seems to be triggering bugs
like this more often:
https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/1871538/
This happens since Hirsute (dbus 1.12.20-1ubuntu3), where the
following delta was added:
Index: dbus-1.12.20/bus/dbus.socket.in
===================================================================
--- dbus-1.12.20.orig/bus/dbus.socket.in
+++ dbus-1.12.20/bus/dbus.socket.in
@@ -1,5 +1,9 @@
[Unit]
Description=D-Bus System Message Bus Socket
+# Do not stop on shutdown
+DefaultDependencies=no
+Wants=sysinit.target
+After=sysinit.target basic.target
[Socket]
ListenStream=@DBUS_SYSTEM_SOCKET@
It leads to deadlock situations like this:
09:23:59.276245 systemd[1]: basic.target: starting held back, waiting for:
sockets.target
09:23:59.276438 systemd[1]: dbus.socket: starting held back, waiting for:
basic.target
09:23:59.304393 systemd[1]: dbus.service: starting held back, waiting for:
dbus.socket
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