[Bug 1936948] Re: Dependency loop via sockets.target

[Lukas Märdian]

** Description changed:

  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
+  [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@
+  [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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https://bugs.launchpad.net/bugs/1936948

Title:
  Dependency loop via sockets.target

Status in dbus package in Ubuntu:
  Confirmed
Status in dbus source package in Impish:
  Confirmed

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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