[Bug 210906] [lor] lock order reversal in vfs_mount/vfs_subr under ZFS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210906

            Bug ID: 210906
           Summary: [lor] lock order reversal in vfs_mount/vfs_subr under
                    ZFS
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: freebsd at otoh.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

lock order reversal:
 1st 0xfffff80004da07c8 zfs (zfs) @ /usr/src/sys/kern/vfs_mount.c:848
 2nd 0xfffff8000f8535f0 devfs (devfs) @ /usr/src/sys/kern/vfs_subr.c:2523
stack backtrace:
#0 0xffffffff80aae180 at witness_debugger+0x70
#1 0xffffffff80aae074 at witness_checkorder+0xe54
#2 0xffffffff80a26dc2 at __lockmgr_args+0x4c2
#3 0xffffffff80afeebc at vop_stdlock+0x3c
#4 0xffffffff810738ea at VOP_LOCK1_APV+0xda
#5 0xffffffff80b1fc2a at _vn_lock+0x9a
#6 0xffffffff80b10123 at vget+0x63
#7 0xffffffff8092122d at devfs_allocv+0xcd
#8 0xffffffff80920d33 at devfs_root+0x43
#9 0xffffffff80b0746e at vfs_donmount+0x144e
#10 0xffffffff80b05ff2 at sys_nmount+0x72
#11 0xffffffff80f16b2b at amd64_syscall+0x2db
#12 0xffffffff80ef68cb at Xfast_syscall+0xfb

Noticed when stopping a ZFS mounted jail.
11.0 Alpha 6

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