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[chenyu <chenyu105@xxxxxxxxx>]

update 2015 05 16
It seems that, dbus-deamon has received a poweroff meesage  then it fork the systemd-shim to shutdown the system, here's the backtrace for systemd-shim . we can see that ,dbus-daemon --system --fork leverage systemd-shim to perform the poweroff.
however, who sends the poweroff message to dbus-daemon???

init
  |-ModemManager
  |   `-2*[{ModemManager}]
  |-NetworkManager
  |   |-dhclient -d -sf /usr/lib/NetworkManager/nm-dhcp-client.action -pf ...
  |   |-dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-interfaces--pid-file=/run/sendsigs.omit.d/network-manager.dnsm
  |   `-3*[{NetworkManager}]
  |-acpid -c /etc/acpi/events -s /var/run/acpid.socket
  |   `-sh -c /etc/acpi/powerbtn.sh
  |       `-powerbtn.sh /etc/acpi/powerbtn.sh
  |-avahi-daemon
  |   `-avahi-daemon
  |-bluetoothd
  |-cron
  |-cups-browsed
  |-cupsd -f
  |   `-dbus dbus://
  |-dbus-daemon --system --fork
  |   `-dbus-daemon --system --fork
  |       `-systemd-shim /usr/lib/x86_64-linux-gnu/systemd-shim
  |           `-pstree -a
  |-getty -8 38400 tty4
  |-getty -8 38400 tty5
  |-getty -8 38400 tty2
  |-getty -8 38400 tty3
  |-getty -8 38400 tty6
  |-irqbalance
  |-kerneloops
  |-login --
  |   `-bash
  |       `-sudo -s
  |           `-bash
  |-polkitd --no-debug
  |   `-2*[{polkitd}]
  |-rsyslogd
  |   `-3*[{rsyslogd}]
  |-sshd -D
  |-systemd-logind
  |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   |-systemd-udevd --daemon
  |   `-systemd-udevd --daemon
  |-upstart-file-br --daemon
  |-upstart-socket- --daemon
  |-upstart-udev-br --daemon
  `-whoopsie
      `-2*[{whoopsie}]

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https://bugs.launchpad.net/bugs/1455520

Title:
   systemd-shim executes 'poweroff' after resuming from suspend-to-
  memory(S3)

Status in systemd-shim package in Ubuntu:
  New

Bug description:
  Hi,all
  I'm using latest kernel 4.1-rc3 on ubuntu 14.04.2 LTS X86_64,
  and I found that, after resuming from suspend-to-memory,
  the systemd-shim deamon will execute a 'poweroff', which 
  shuts the system down. 

  here's my step to reproduce the bug:

  1.echo mem > /sys/power/state //ok
  2.wait for 30 seconds        //ok
  3.push power button          //ok
  4.system resumes automatically //ok
  5.after a few seconds, system shutdown //oh no...

  I replace /sbin/shutdown with a script that prints the current process
  backtrace by pstree, then the system will not halt after resumming
  from suspend-to-memory. Here's my script:

  # cat /sbin/shutdown
  #!/bin/sh
  pstree -a > /home/chenyu/shutdown_trace.log

  and here's the backtrace when system is executing my 'shutdown', after
  resumming, we can see that, systemd-shim invokes 'sh -c
  /sbin/poweroff':

  
  init
    |-ModemManager
    |   `-2*[{ModemManager}]
    |-NetworkManager
    |   `-3*[{NetworkManager}]
    |-acpid -c /etc/acpi/events -s /var/run/acpid.socket
    |   `-sh -c /etc/acpi/powerbtn.sh
    |-anacron -s
    |-avahi-daemon
    |   `-avahi-daemon
    |-bluetoothd
    |-cron
    |-cups-browsed
    |-cupsd -f
    |   `-dbus dbus:// 
    |-dbus-daemon --system --fork
    |-getty -8 38400 tty4
    |-getty -8 38400 tty5
    |-getty -8 38400 tty2
    |-getty -8 38400 tty3
    |-getty -8 38400 tty6
    |-irqbalance
    |-kerneloops
    |-login --       
    |   `-bash
    |       `-sudo -s
    |           `-bash
    |-ondemand /etc/init.d/ondemand background
    |   `-sleep 60
    |-polkitd --no-debug
    |   `-2*[{polkitd}]
    |-rsyslogd
    |   `-3*[{rsyslogd}]
    |-sshd -D
    |-systemd-logind
    |-systemd-shim
    |   |-sh -c /sbin/poweroff
    |   |   `-shutdown /sbin/shutdown -h -P now
    |   |       `-pstree -a
    |   `-2*[{systemd-shim}]
    |-systemd-udevd --daemon
    |   |-systemd-udevd --daemon
    |   |-systemd-udevd --daemon
    |   |-systemd-udevd --daemon
    |   |-systemd-udevd --daemon
    |   |-systemd-udevd --daemon
    |   |-systemd-udevd --daemon
    |   |-systemd-udevd --daemon
    |   |-systemd-udevd --daemon
    |   `-systemd-udevd --daemon
    |-upstart-file-br --daemon
    |-upstart-socket- --daemon
    |-upstart-udev-br --daemon
    `-whoopsie
        `-2*[{whoopsie}]

  Since I'm not sure why systemd-shim act like this, I would be 
  happy to debug with your suggestion, and give feedback to you.


  Best Regards,
  Yu

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