[Bug 1723644] [NEW] NetworkManager hang

[Mihai Bojescu]

Public bug reported:

Recently I had issues with NetworkManager. When I try to restart or close 
NetworkManager, the process hangs. First it sends a SIGTERM to the 
NetworkManager process, and after a while it sends SIGKILL, yet nothing 
happens. After the attempt to restart/close NetworkManager, the OS behaves 
badly:
- journalctl doesn't work, doesn't output anything, SIGTERMing/SIGABRTing/
SIGKILLing it causes the kill command to hang (no matter how many times I try 
it), it also hangs the terminal
- 'sudo dmesg' hangs (killing it with SIGKILL/SIGTERM/SIGABRT hangs the kill 
command, can't close the terminal)
- the OS won't reboot/suspend/shutdown (it does only after holding the restart 
button)

Suspending/rebooting normally/shutdowning normally the laptop hangs the OS 
(because of NetworkManager).

What I've tried:
- reinstalling NetworkManager (using --purge)
- deleting ~/.config
- deleting ~/.cache
- installing a version from NetworkManager from Debian (version: 1.8.4.2), 
reinstalling NetworkManager from Ubuntu back

 affects ubuntu
 affects ubuntu/network-manager
 affects ubuntu/systemd

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "kernellog.txt"
   https://bugs.launchpad.net/bugs/1723644/+attachment/4971187/+files/kernellog.txt

** Attachment added: "journalctl.txt"
   https://bugs.launchpad.net/bugs/1723644/+attachment/4971188/+files/journalctl.txt

** Attachment added: "networkmanagerlog.txt"
   https://bugs.launchpad.net/bugs/1723644/+attachment/4971189/+files/networkmanagerlog.txt

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https://bugs.launchpad.net/bugs/1723644

Title:
  NetworkManager hang

Status in network-manager package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Recently I had issues with NetworkManager. When I try to restart or close 
  NetworkManager, the process hangs. First it sends a SIGTERM to the 
  NetworkManager process, and after a while it sends SIGKILL, yet nothing 
  happens. After the attempt to restart/close NetworkManager, the OS behaves 
  badly:
  - journalctl doesn't work, doesn't output anything, SIGTERMing/SIGABRTing/
  SIGKILLing it causes the kill command to hang (no matter how many times I try 
  it), it also hangs the terminal
  - 'sudo dmesg' hangs (killing it with SIGKILL/SIGTERM/SIGABRT hangs the kill 
  command, can't close the terminal)
  - the OS won't reboot/suspend/shutdown (it does only after holding the restart 
  button)

  Suspending/rebooting normally/shutdowning normally the laptop hangs the OS 
  (because of NetworkManager).

  What I've tried:
  - reinstalling NetworkManager (using --purge)
  - deleting ~/.config
  - deleting ~/.cache
  - installing a version from NetworkManager from Debian (version: 1.8.4.2), 
  reinstalling NetworkManager from Ubuntu back

   affects ubuntu
   affects ubuntu/network-manager
   affects ubuntu/systemd

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