For posterity: If https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1505564/comments/143 is the cause of this issue for you, dmesg -D (which turns off console logging of kernel messages) might be a viable workaround until you can reboot.
For posterity: If https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1505564/ comments/ 143 is the cause of this issue for you, dmesg -D (which turns off console logging of kernel messages) might be a viable workaround until you can reboot.