[Bug 225923] ZFS lock order reversal in vfs_subr.c:2157 vfs_subr.c:2607

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225923

            Bug ID: 225923
           Summary: ZFS lock order reversal in vfs_subr.c:2157
                    vfs_subr.c:2607
           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

build: 12.0-CURRENT r329245
hardware: amd64

lock order reversal:
 1st 0xfffff800098945f0 syncer (syncer) @ /usr/src/sys/kern/vfs_subr.c:2157
 2nd 0xfffff80025048240 zfs (zfs) @ /usr/src/sys/kern/vfs_subr.c:2607
stack backtrace:
#0 0xffffffff80b2e403 at witness_debugger+0x73
#1 0xffffffff80b2e284 at witness_checkorder+0xe34
#2 0xffffffff80a9e4d1 at lockmgr_lock_fast_path+0x1b1
#3 0xffffffff810fdc09 at VOP_LOCK1_APV+0xd9
#4 0xffffffff80ba99b6 at _vn_lock+0x66
#5 0xffffffff80b9834f at vget+0x7f
#6 0xffffffff80b9a3e6 at vfs_msync+0xa6
#7 0xffffffff80b9f0c6 at sync_fsync+0xc6
#8 0xffffffff810fcb79 at VOP_FSYNC_APV+0xd9
#9 0xffffffff80b9cf34 at sched_sync+0x284
#10 0xffffffff80a89ec4 at fork_exit+0x84
#11 0xffffffff80f5acde at fork_trampoline+0xe

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