[Bug 216380] mv /[dir == mountpoint] causes kernel panic

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216380

            Bug ID: 216380
           Summary: mv /[dir == mountpoint] causes kernel panic
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: standards
          Assignee: freebsd-standards at FreeBSD.org
          Reporter: fnacl at protonmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 179223
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179223&action=edit
vbox screenshot

Playback:
# zfs create zroot/test
# mv /test /home/testdir
-> panic

also in UFS, if the mv arguments coincide with mountpoints

# uname -a
FreeBSD 12.0-CURRENT #0 r311461: Thu Jan 5 22:46:38 UTC 2017 
root at releng3.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64

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