Looks like the issue starts when connect a USB wifi dongle (based on ath9k_htc). After a fresh NetworkManager restart, journalctl shows that USB device is enumerated periodically, and for some reasons, failed to be configured correctly.
We can conclude that there is a FD leakage every time a new interface is inserted/removed. I will check what is wrong with the enumeration/configuration. ** Attachment added: "journalctl.log" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1716884/+attachment/4949346/+files/journalctl.log -- 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1716884/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
