Public bug reported:

Detected when I failed to start a vpn client session.

journalctl shows line like:
sept. 13 10:37:29 xxx NetworkManager[1092]: <warn>  [1505291849.7302] 
vpn-connection[0x2786800,4cd810de-c299-41e9-bf4b-c6df18d09b66,"xxx",0]: Could 
not launch the VPN service. error: Trop de fichiers ouverts.

Indeed, /proc/$PID/fd is full of socket file descriptors.  (with PID the
pid of NetworkManager)

"strace -e socket -p $PID -f" shows that a netlink socket is opened
every 3s and never closed.

   [pid  9384] socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC,
NETLINK_GENERIC) = 361

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: network-manager 1.2.6-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.11.0-14.20~16.04.1-generic 4.11.12
Uname: Linux 4.11.0-14-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Sep 13 11:12:05 2017
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2016-06-23 (447 days ago)
InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Release amd64 
(20160622)
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-nm:
 RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI  
   WWAN-HW  WWAN    
 running  1.2.6    connected  started  full          enabled     enabled  
enabled  enabled  enabled

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


** Tags: amd64 apport-bug third-party-packages xenial

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1716884

Title:
  network-manager consume too much file descriptor and is not able to
  work correctly

Status in network-manager package in Ubuntu:
  New

Bug description:
  Detected when I failed to start a vpn client session.

  journalctl shows line like:
  sept. 13 10:37:29 xxx NetworkManager[1092]: <warn>  [1505291849.7302] 
vpn-connection[0x2786800,4cd810de-c299-41e9-bf4b-c6df18d09b66,"xxx",0]: Could 
not launch the VPN service. error: Trop de fichiers ouverts.

  Indeed, /proc/$PID/fd is full of socket file descriptors.  (with PID
  the pid of NetworkManager)

  "strace -e socket -p $PID -f" shows that a netlink socket is opened
  every 3s and never closed.

     [pid  9384] socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC,
  NETLINK_GENERIC) = 361

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: network-manager 1.2.6-0ubuntu0.16.04.1
  ProcVersionSignature: Ubuntu 4.11.0-14.20~16.04.1-generic 4.11.12
  Uname: Linux 4.11.0-14-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Wed Sep 13 11:12:05 2017
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2016-06-23 (447 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Release amd64 
(20160622)
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  
WIFI     WWAN-HW  WWAN    
   running  1.2.6    connected  started  full          enabled     enabled  
enabled  enabled  enabled

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