[Bug 200353] lock order reversal (vfs_mount.c and vfs_subr.c)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200353

            Bug ID: 200353
           Summary: lock order reversal (vfs_mount.c and vfs_subr.c)
           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 tim.thechases.com

Created attachment 156988
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=156988&action=edit
dmesg output with backtrace

On booting, I get this in my dmesg
===================================================
lock order reversal:
 1st 0xfffff8003135e5f0 zfs (zfs) @ /usr/src/sys/kern/vfs_mount.c:848
 2nd 0xfffff800313d37c8 devfs (devfs) @ /usr/src/sys/kern/vfs_subr.c:2164
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00dcf75490
witness_checkorder() at witness_checkorder+0xe50/frame 0xfffffe00dcf75520
__lockmgr_args() at __lockmgr_args+0xacf/frame 0xfffffe00dcf75650
vop_stdlock() at vop_stdlock+0x3c/frame 0xfffffe00dcf75670
VOP_LOCK1_APV() at VOP_LOCK1_APV+0xfc/frame 0xfffffe00dcf756a0
_vn_lock() at _vn_lock+0x8a/frame 0xfffffe00dcf75710
vget() at vget+0x67/frame 0xfffffe00dcf75750
devfs_allocv() at devfs_allocv+0xfd/frame 0xfffffe00dcf757a0
devfs_root() at devfs_root+0x43/frame 0xfffffe00dcf757d0
vfs_donmount() at vfs_donmount+0x153e/frame 0xfffffe00dcf75aa0
sys_nmount() at sys_nmount+0x71/frame 0xfffffe00dcf75ae0
amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe00dcf75bf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe00dcf75bf0
--- syscall (378, FreeBSD ELF64, sys_nmount), rip = 0x800aac5fa, rsp =
0x7fffffffdc28, rbp = 0x7fffffffe190 ---
===================================================
It doesn't appear to impact my system since (AFAICT) it appears to be working
fine, but if it's a bug, I wanted to make sure it got reported.  I can provide
extra info as needed, as it's just a tinkering machine.

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