[Bug 194913] New: Problem with mount_nullfs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194913

            Bug ID: 194913
           Summary: Problem with mount_nullfs
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dawid.piotrowski at gmail.com

I discoverd an issue with mount_nullfs binary. When phisical drive eg.
/dev/da0p2 is mounted to / and i mount_nullfs eg. /home/user /mnt (or any other
place), there is a problem with updating space in df -h. What i know, when i do
dd if=/dev/zero of=bigfile bs=1024 count=5120000 in /mnt and do df -h i get
properly announced space (-500mb of free space), but when i deleted bigfile in
/mnt that 500MB wont back to Avail neither on nullfs mount or in phisical drive
mount. What helps is unmounting nullfs and then space info get updated on
phisical drive mount. 
I did a tests on 2 diferent machines, both with latest stable FreeBSD. If
needed i can provide additional info.

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