While I shutdown my notebook, a Kernel Oops occour. I'm using Ubuntu 14.04 with an updated kernel. This is the full log I have received: wait-for-state stop/waiting Emabling radios: wifi. Applying power save settings...done. * Stopping Adaptive readahead daemon preload * * Stopping dynamic firewall daemon firewalld Stopping GNUstep distributed object mapper: gdomap. * jetty is not installed * Stopping Name Service Cache Daemon nscd * Stopping rsync daemon rsync * speech-dispatcher disabled; edit /etc/default/speech-dispatcher * Stopping VirtualBox kernel modules * VirtualBox Additions disabled, not in a Virtual Machine * Stopping PostgreSQL 9.3 database server * Clearing ebtables rulesets * No VPN is running. nm-dispatcher.action: Caught signal 15, shutting down... [21756.161966] BUG: unable to handle kernel NULL pointer dereference at (null) [21756.162019] IP: [<ffffffff810ba3aa>] __wake_up_common+0x2a/0x90 [21756.162061] PGD 0 [21756.162074] Oops: 0000 [#1]