[Bug 197792] When attempting to mount a filesystem read-only the system hangs.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197792

            Bug ID: 197792
           Summary: When attempting to mount a filesystem read-only the
                    system hangs.
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ictmanager at felsted.org

I have a number of machines that have a /usr partition mounted read-only upon
startup. In order to apply patches to them I have to remount the partition
read-write. After applying patches I then wish to remount read-only. This final
step causes the system to become unresponsive.

# mount -o rw -u /usr
# freebsd-update fetch
# freebsd-update install
# mount -o ro -u /usr

My ssh session ceases to respond and I am unable to establish a new ssh
session. Breaking out using Ctrl+Z and putting the command into the background
does not allow me to use the existing session.

However, remotely, the machine can still be pinged.

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