I have found this reproduces when you have an active NFSv4 mount (eg /home) and bring the ethernet interface on the client down, eg unplug the cable.
-- kernel bug rpc nfs client https://bugs.launchpad.net/bugs/212485 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs