The bug is somehow related to how cgroup puts every process into a default cgroup. You can un-wedge the hung 'rmmod' via
pgrep kstop > /mnt/cgroup/cpu/tasks -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/693594 Title: rmmod hangs if cgroup-bin is installed -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs