[Bug 196102] New: "gpart: device busy" even though it's not in use

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196102

            Bug ID: 196102
           Summary: "gpart: device busy" even though it's not in use
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: david at bitmail.cc

i bought a new hard drive, and am trying to setup geli with ZFS on it.
geli refuses to write the metadata, when the first partition is too big.
so i am trying to delete the first partition, to recreate a smaller one.
yet gpart claims my drive is "busy". here's the relevant output:

root at mango:/etc/ > gpart delete -i0 da0
gpart: index '0': No such file or directory
root at mango:/etc/ > gpart delete -i1 da0
gpart: Device busy
root at mango:/etc/ > gpart destroy -F da0
gpart: Device busy
root at mango:/etc/ > sysctl kern.geom.debugflags=16
kern.geom.debugflags: 16 -> 16
root at mango:/etc/ > gpart show da0
=>        40  7814037088  da0  GPT  (3.6T)
          40  7814037080    1  freebsd-zfs  (3.6T)
  7814037120           8       - free -  (4.0K)

root at mango:/etc/ > dd if=/dev/zero of=/dev/da0 bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes transferred in 2.630170 secs (39867229 bytes/sec)
root at mango:/etc/ > gpart show da0                             
=>        40  7814037088  da0  GPT  (3.6T)
          40  7814037080    1  freebsd-zfs  (3.6T)
  7814037120           8       - free -  (4.0K)

root at mango:/etc/ > gpart destroy -F da0                       
gpart: Device busy
root at mango:/etc/ > mount
sys/ROOT/default on / (zfs, local, noatime, nfsv4acls)
devfs on /dev (devfs, local, multilabel)
data on /data (zfs, local, noatime, nfsv4acls)
backup/default on /mnt (zfs, local, noatime, nfsv4acls)
sys/ports on /usr/ports (zfs, local, noatime, nfsv4acls)
sys/src on /usr/src (zfs, local, noatime, nfsv4acls)
root at mango:/etc/ > umount /dev/da0
umount: /dev/da0: unknown file system
root at mango:/etc/ > fuser /dev/da0 
/dev/da0:
root at mango:/etc/ > uname -a
FreeBSD mango 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r275830: Wed Dec 17 13:33:45
CET 2014     root at mango:/usr/obj/usr/src/sys/GENERIC-NODEBUG  amd64

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