The bug exist in the latest upstream kernel, error messages when try to reboot:
[INFO] task systemd-udevd:1593 blocked more than 120 seconds Not tainted 3.15.0-031500rc5-generic #201405091635 [INFO] task kworker:0:1:153 blocked more than 120 seconds Not tainted 3.15.0-031500rc5-generic #201405091635 [INFO] task reboot:2078 blocked more than 120 seconds Not tainted 3.15.0-031500rc5-generic #201405091635 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1320237 Title: Ubuntu 14.04 LTS unable to reboot Status in “linux” package in Ubuntu: Confirmed Bug description: Dear community, I found a very annoying bug when i try to reboot my fresh ubuntu 14.04. uname -a Linux neutrino 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux After sudo reboot the system going to reboot, but after Stopping system V runlevel compatibility [OK] line its halt and i get this message: [INFO]task systemd-udevd:1596 [and more different program name] blocked more than 120 seconds Not tainted 3.13.0-24-generic #47-Ubuntu This is a fresh, clear install, it has only apache, ssh, exim4, courier, mysql. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1320237/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp