nfs: panic: fsync: vnode is not exclusive locked but should be

Just netbooted a main (0d843cc2e2a373f01f) GENERIC to do some testing on
a board I rarely use before pushing changes and got the below.
Has this been fixed already?

...
Last login: Sun May 25 19:37:45 on ttyu0
VNASSERT failed: locked not true at /usr/src/bz_wifi_precommit_testing/sys/kern/vfs_subr.c:5795 (assert_vop_elocked)
0xfffff8000761b000: type VREG state VSTATE_CONSTRUCTED op 0xffffffff81aad768
     usecount 2, writecount 0, refcount 3 seqc users 0
     hold count flags ()
     flags (VV_VMSIZEVNLOCK|VMP_LAZYLIST)
     v_object 0xfffff80005d991f0 ref 0 pages 1 cleanbuf 0 dirtybuf 1
     lock type nfs: SHARED (count 1)
Aug 27 13:16:38         fapu2e4b login[19ileid 18620252 fsid 0x3a3a00ff01
panic: fsync: vnode is not exclusive locked but should be
cpuid = 3
time = 1756300598
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0067d3a4c0
vpanic() at vpanic+0x136/frame 0xfffffe0067d3a5f0
panic() at panic+0x43/frame 0xfffffe0067d3a650
vop_fsync_debugprepost() at vop_fsync_debugprepost+0x124/frame 0xfffffe0067d3a690
VOP_FSYNC_APV() at VOP_FSYNC_APV+0x23/frame 0xfffffe0067d3a6b0
bufsync() at bufsync+0x3b/frame 0xfffffe0067d3a6e0
bufobj_invalbuf() at bufobj_invalbuf+0x24f/frame 0xfffffe0067d3a740
ncl_vinvalbuf() at ncl_vinvalbuf+0x100/frame 0xfffffe0067d3a7b0
nlm_advlock_internal() at nlm_advlock_internal+0xa7/frame 0xfffffe0067d3aaf0
nlm_advlock() at nlm_advlock+0x2d/frame 0xfffffe0067d3ab10
nfs_advlock() at nfs_advlock+0x1d0/frame 0xfffffe0067d3ac30
vop_sigdefer() at vop_sigdefer+0x30/frame 0xfffffe0067d3ac60
VOP_ADVLOCK_APV() at VOP_ADVLOCK_APV+0x51/frame 0xfffffe0067d3ac90
vn_closefile() at vn_closefile+0x9a/frame 0xfffffe0067d3ad10
_fdrop() at _fdrop+0x1a/frame 0xfffffe0067d3ad30
closef() at closef+0x1e3/frame 0xfffffe0067d3adc0
closefp_impl() at closefp_impl+0x71/frame 0xfffffe0067d3ae00
amd64_syscall() at amd64_syscall+0x169/frame 0xfffffe0067d3af30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0067d3af30
--- syscall (6, FreeBSD ELF64, close), rip = 0x1ea0dba28cca, rsp = 0x1ea0d6def6b8, rbp = 0x1ea0d6def6e0 ---
KDB: enter: panic
[ thread pid 1955 tid 100182 ]
Stopped at      kdb_enter+0x33: movq    $0,0x1222d22(%rip)
db> show alllocks
Process 1955 (login) thread 0xfffff80005dda000 (100182)
exclusive lockmgr nfsupg (nfsupg) r = 0 (0xfffffe006b1557e0) locked @ /usr/src/bz_wifi_precommit_testing/sys/fs/nfsclient/nfs_clsubs.c:146
shared lockmgr nfs (nfs) r = 0 (0xfffff8000761b070) locked @ /usr/src/bz_wifi_precommit_testing/sys/fs/nfsclient/nfs_clvnops.c:3477
Process 1817 (syslogd) thread 0xfffff80005d85780 (100108)
exclusive lockmgr nfs (nfs) r = 0 (0xfffff800447a33e0) locked @ /usr/src/bz_wifi_precommit_testing/sys/kern/vfs_vnops.c:1243

-- 
Bjoern A. Zeeb                                                     r15:7