[Bug 221570] lock order reversal fs_mount.c:1271, msdosfs_vfsops.c:928

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221570

            Bug ID: 221570
           Summary: lock order reversal fs_mount.c:1271,
                    msdosfs_vfsops.c:928
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: vidwer+fbsdbugs at gmail.com

Running 12.0-CURRENT, r322543

LOR:

lock order reversal:
 1st 0xfffff80042f839a0 zfs (zfs) @ /usr/src/sys/kern/vfs_mount.c:1271
 2nd 0xfffff80042f745f0 devfs (devfs) @
/usr/src/sys/fs/msdosfs/msdosfs_vfsops.c:928
stack backtrace:
#0 0xffffffff80ac3870 at witness_debugger+0x70
#1 0xffffffff80ac36f2 at witness_checkorder+0xe02
#2 0xffffffff80a3785e at lockmgr_lock_fast_path+0x1ae
#3 0xffffffff81066610 at VOP_LOCK1_APV+0xe0
#4 0xffffffff80b3c3c6 at _vn_lock+0x66
#5 0xffffffff8093bcc0 at msdosfs_sync+0x1a0
#6 0xffffffff80b231fd at dounmount+0x5fd
#7 0xffffffff80b22b7f at sys_unmount+0x30f
#8 0xffffffff80eeb40b at amd64_syscall+0x79b
#9 0xffffffff80ecabeb at Xfast_syscall+0xfb

Attach, detach:
da0 at umass-sim0 bus 0 scbus8 target 0 lun 0
da0: <SanDisk Cruzer Edge 1.27> Removable Direct Access SPC-4 SCSI device
da0: Serial Number 4C530001520818118305
da0: 40.000MB/s transfers
da0: 7485MB (15330304 512 byte sectors)
da0: quirks=0x2<NO_6_BYTE>
ugen3.2: <SanDisk Cruzer Edge> at usbus3 (disconnected)
umass0: at uhub4, port 2, addr 2 (disconnected)
da0 at umass-sim0 bus 0 scbus8 target 0 lun 0
da0: <SanDisk Cruzer Edge 1.27>  s/n 4C530001520818118305 detached
(da0:umass-sim0:0:0:0): Periph destroyed
umass0: detached

The disk is formatted as:
$ gpart show da0
=>       1  15330303  da0  MBR  (7.3G)
         1        31       - free -  (16K)
        32  15330272    1  fat32  (7.3G)

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