nm-dispatcher caused kernel crash.

[spit4520]

After "waking" (shaking my mouse) to revive the display server my machine was usable for about 1 minute after the wake. Then all of the sudden all of my USB devices lost power completely, my hard drives stopped spinning and the system was at a stand still. Reading into the log files I find that the last thing the system did before it died. It was in the process of a "dhcp4 change". I would also like to mention I was running 3 VNC server sessions at the same time, but none of the viewers were active. I also confirmed that the power supply is defiantly not the reason its a 1000 watt platinum PSU that is under a year old and the system was usable again after a reboot.

I am using Kernel version 4.11.7 built from the mainline with the Ubuntu configuration. There were no custom modules loaded (nothing outside of the 16.04.2 repo)

here is the log /var/log/syslog

Jul 28 22:27:43 Nova-Omega dhclient[3065]: DHCPACK of 10.10.20.115 from 10.10.20.1
Jul 28 22:27:43 Nova-Omega NetworkManager[1181]: <info> [1501295263.5871] address 10.10.20.115
Jul 28 22:27:43 Nova-Omega NetworkManager[1181]: <info> [1501295263.5871] plen 24 (255.255.255.0)
Jul 28 22:27:43 Nova-Omega NetworkManager[1181]: <info> [1501295263.5871] gateway 10.10.20.1
Jul 28 22:27:43 Nova-Omega dhclient[3065]: bound to 10.10.20.115 -- renewal in 243 seconds.
Jul 28 22:27:43 Nova-Omega NetworkManager[1181]: <info> [1501295263.5871] server identifier 10.10.20.1
Jul 28 22:27:43 Nova-Omega NetworkManager[1181]: <info> [1501295263.5872] lease time 600
Jul 28 22:27:43 Nova-Omega NetworkManager[1181]: <info> [1501295263.5872] nameserver '8.8.8.8'
Jul 28 22:27:43 Nova-Omega NetworkManager[1181]: <info> [1501295263.5872] nameserver '8.8.4.4'
Jul 28 22:27:43 Nova-Omega NetworkManager[1181]: <info> [1501295263.5872] dhcp4 (enp35s0): state changed bound -> bound
Jul 28 22:27:43 Nova-Omega dbus[1039]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
Jul 28 22:27:43 Nova-Omega systemd[1]: Starting Network Manager Script Dispatcher Service...
Jul 28 22:27:43 Nova-Omega dbus[1039]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jul 28 22:27:43 Nova-Omega systemd[1]: Started Network Manager Script Dispatcher Service.
Jul 28 22:27:43 Nova-Omega nm-dispatcher: req:1 'dhcp4-change' [enp35s0]: new request (2 scripts)
Jul 28 22:27:43 Nova-Omega nm-dispatcher: req:1 'dhcp4-change' [enp35s0]: start running ordered scripts...
Jul 28 22:31:46 Nova-Omega dhclient[3065]: DHCPREQUEST of 10.10.20.115 on enp35s0 to 10.10.20.1 port 67 (xid=0x2d7aba42)
Jul 28 22:31:46 Nova-Omega dhclient[3065]: DHCPACK of 10.10.20.115 from 10.10.20.1
Jul 28 22:31:46 Nova-Omega NetworkManager[1181]: <info> [1501295506.1854] address 10.10.20.115
Jul 28 22:31:46 Nova-Omega NetworkManager[1181]: <info> [1501295506.1854] plen 24 (255.255.255.0)
Jul 28 22:31:46 Nova-Omega NetworkManager[1181]: <info> [1501295506.1855] gateway 10.10.20.1
Jul 28 22:31:46 Nova-Omega NetworkManager[1181]: <info> [1501295506.1855] server identifier 10.10.20.1
Jul 28 22:31:46 Nova-Omega NetworkManager[1181]: <info> [1501295506.1855] lease time 600
Jul 28 22:31:46 Nova-Omega NetworkManager[1181]: <info> [1501295506.1855] nameserver '8.8.8.8'
Jul 28 22:31:46 Nova-Omega NetworkManager[1181]: <info> [1501295506.1855] nameserver '8.8.4.4'
Jul 28 22:31:46 Nova-Omega NetworkManager[1181]: <info> [1501295506.1856] dhcp4 (enp35s0): state changed bound -> bound
Jul 28 22:31:46 Nova-Omega dbus[1039]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
Jul 28 22:31:46 Nova-Omega systemd[1]: Starting Network Manager Script Dispatcher Service...
Jul 28 22:31:46 Nova-Omega dhclient[3065]: bound to 10.10.20.115 -- renewal in 298 seconds.
Jul 28 22:31:46 Nova-Omega dbus[1039]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jul 28 22:31:46 Nova-Omega systemd[1]: Started Network Manager Script Dispatcher Service.
Jul 28 22:31:46 Nova-Omega nm-dispatcher: req:1 'dhcp4-change' [enp35s0]: new request (2 scripts)
Jul 28 22:31:46 Nova-Omega nm-dispatcher: req:1 'dhcp4-change' [enp35s0]: start running ordered scripts...
Jul 28 22:33:16 Nova-Omega smartd[1021]: Device: /dev/sda [SAT], SMART Usage Attribute: 189 Airflow_Temperature_Cel changed from 27 to 26
Jul 28 22:33:16 Nova-Omega smartd[1021]: Device: /dev/sda [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 27 to 26
Jul 28 22:33:17 Nova-Omega smartd[1021]: Device: /dev/sdc [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 214 to 222
Jul 28 22:37:27 Nova-Omega rsyslogd: [origin software="rsyslogd" swVersion="8.16.0" x-pid="1043" x-info="http://www.rsyslog.com"] start
Jul 28 22:37:27 Nova-Omega rsyslogd-2222: command 'KLogPermitNonKernelFacility' is currently not permitted - did you already set it via a RainerScript command (v6+ config)? [v8.16.0 try http://www.rsyslog.com/e/2222 ]
Jul 28 22:37:27 Nova-Omega rsyslogd: rsyslogd's groupid changed to 108
Jul 28 22:37:27 Nova-Omega rsyslogd: rsyslogd's userid changed to 104
Jul 28 22:37:27 Nova-Omega systemd-modules-load[363]: Inserted module 'lp'
Jul 28 22:37:27 Nova-Omega systemd-modules-load[363]: Inserted module 'ppdev'
Jul 28 22:37:27 Nova-Omega systemd-modules-load[363]: Inserted module 'parport_pc'
Jul 28 22:37:27 Nova-Omega systemd[1]: Started Load Kernel Modules.
Jul 28 22:37:27 Nova-Omega systemd[1]: Starting Apply Kernel Variables...
Jul 28 22:37:27 Nova-Omega systemd[1]: Mounting FUSE Control File System...
Jul 28 22:37:27 Nova-Omega systemd[1]: Mounted FUSE Control File System.
Jul 28 22:37:27 Nova-Omega ureadahead[369]: ureadahead: Error while tracing: No such file or directory
Jul 28 22:37:27 Nova-Omega ureadahead[369]: Counted 16 CPUs
Jul 28 22:37:27 Nova-Omega systemd[1]: ureadahead.service: Main process exited, code=exited, status=5/NOTINSTALLED
Jul 28 22:37:27 Nova-Omega systemd[1]: ureadahead.service: Unit entered failed state.
Jul 28 22:37:27 Nova-Omega systemd[1]: ureadahead.service: Failed with result 'exit-code'.
Jul 28 22:37:27 Nova-Omega rsyslogd-2039: Could not open output pipe '/dev/xconsole':: No such file or directory [v8.16.0 try http://www.rsyslog.com/e/2039 ]
Jul 28 22:37:27 Nova-Omega systemd[1]: Started Apply Kernel Variables.
Jul 28 22:37:27 Nova-Omega systemd[1]: Started Create Static Device Nodes in /dev.
Jul 28 22:37:27 Nova-Omega systemd[1]: Starting udev Kernel Device Manager...
Jul 28 22:37:27 Nova-Omega loadkeys[365]: Loading /etc/console-setup/cached.kmap.gz
Jul 28 22:37:27 Nova-Omega systemd[1]: Started Set console keymap.
Jul 28 22:37:27 Nova-Omega rsyslogd-2007: action 'action 10' suspended, next retry is Fri Jul 28 22:37:57 2017 [v8.16.0 try http://www.rsyslog.com/e/2007 ]
Jul 28 22:37:27 Nova-Omega systemd[1]: Mounted RPC Pipe File System.
Jul 28 22:37:27 Nova-Omega systemd[1]: Started udev Kernel Device Manager.
Jul 28 22:37:27 Nova-Omega systemd[1]: Starting LSB: QEMU KVM module loading script...
Jul 28 22:37:27 Nova-Omega systemd[1]: Starting Remount Root and Kernel File Systems...
Jul 28 22:37:27 Nova-Omega kernel: [ 0.000000] Linux version 4.11.7 (scott@Nova-Omega) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) ) #1 SMP Tue Jun 27 20:59:20 EDT 2017
Jul 28 22:37:27 Nova-Omega kernel: [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.11.7 root=UUID=1aa5ba4f-a73b-4857-af87-434bd735665e ro splash quiet vt.handoff=7
Jul 28 22:37:27 Nova-Omega systemd[1]: Started Remount Root and Kernel File Systems.
Jul 28 22:37:27 Nova-Omega kernel: [ 0.000000] KERNEL supported cpus:
Jul 28 22:37:27 Nova-Omega kernel: [ 0.000000] Intel GenuineIntel
Jul 28 22:37:27 Nova-Omega kernel: [ 0.000000] AMD AuthenticAMD

I am more than willing to supply any further testing, logs, or answers in order to help gets this resolved. This is the first time I have ever seen this issue and my first time having a issue with networking/network manager

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sebastien Bacher (seb128)]

thank you for your bug report, if the kernel crash it's a bug there, it should be robust to anything userpace is doing, reassigning