[Bug 226007] LOR after unmounting UFS partition on memstick

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226007

            Bug ID: 226007
           Summary: LOR after unmounting UFS partition on memstick
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: vidwer+fbsdbugs at gmail.com

lock order reversal:
 1st 0xfffff800b70d07c8 zfs (zfs) @ /usr/src/sys/kern/vfs_mount.c:1280
 2nd 0xfffff800b703db78 devfs (devfs) @ /usr/src/sys/ufs/ffs/ffs_vfsops.c:1373
stack backtrace:
#0 0xffffffff80b2e4d3 at witness_debugger+0x73
#1 0xffffffff80b2e354 at witness_checkorder+0xe34
#2 0xffffffff80a9e591 at lockmgr_lock_fast_path+0x1b1
#3 0xffffffff810fdc49 at VOP_LOCK1_APV+0xd9
#4 0xffffffff80ba9ae6 at _vn_lock+0x66
#5 0xffffffff80dc10a3 at ffs_flushfiles+0x93
#6 0xffffffff80dc3767 at ffs_unmount+0x87
#7 0xffffffff80b90609 at dounmount+0x519
#8 0xffffffff80b90060 at sys_unmount+0x310
#9 0xffffffff80f7ed0b at amd64_syscall+0x79b
#10 0xffffffff80f5a70d at fast_syscall_common+0x101

root at albatros:~ # gpart show da0
=>      3  8056821  da0  GPT  (3.8G)
        3     1600    1  efi  (800K)
     1603      137    2  freebsd-boot  (69K)
     1740  1942016    3  freebsd-ufs  (948M)
  1943756     2048    4  freebsd-swap  (1.0M)
  1945804  6111020       - free -  (2.9G)

root at albatros:~ # mount /dev/da0p3 /mnt
root at albatros:~ # umount /dev/da0p3

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