Manual testing of ddb show lockedvnods no longer traps with ufs vnodes under construction.
```
# jot 0 | xargs -P10 -I %% sh -c "touch %%; rm %%" &
# dtrace -w -n 'fbt::vfs_hash_insert:entry {chill(100000000)}'
# sysctl debug.kdb.enter=1
debug.kdb.enter:KDB: enter: sysctl debug.kdb.enter
[ thread pid 46169 tid 100285 ]
Stopped at kdb_sysctl_enter+0x95: movq $0,0x121ca00(%rip)
db> show lockedvnods
Locked vnodes
vnode 0xfffff8000685a528: type VDIR state VSTATE_CONSTRUCTED op 0xffffffff81b444b8
usecount 1, writecount 0, refcount 4 seqc users 0 mountedhere 0
hold count flags ()
flags (VMP_LAZYLIST)
v_object 0xfffff8000b622e88 ref 0 pages 6 cleanbuf 0 dirtybuf 1
lock type ufs: SHARED (count 1)
nlink=500, effnlink=496, size=22528, extsize=0
generation=f5e62862, uid=0, gid=0, flags=0x0
ino 1685376, on dev gpt/rootfs
vnode 0xfffff800067cc898: type VDIR state VSTATE_CONSTRUCTED op 0xffffffff81b444b8
usecount 11, writecount 0, refcount 4 seqc users 1 mountedhere 0
hold count flags ()
flags (VMP_LAZYLIST)
v_object 0xfffff8000b6a01f0 ref 0 pages 1 cleanbuf 0 dirtybuf 1
lock type ufs: EXCL by thread 0xfffff80102ee4780 (pid 46167, touch, tid 100213)
with exclusive waiters pending
with shared waiters pending
nlink=2, effnlink=2, size=512, extsize=0
generation=1f74e18d, uid=1000, gid=0, flags=0x0
ino 3157375, on dev gpt/rootfs
vnode 0xfffff80171390528: type VNON state VSTATE_UNINITIALIZED op 0xffffffff81b444b8
usecount 1, writecount 0, refcount 1 seqc users 0
hold count flags ()
flags ()
lock type ufs: EXCL by thread 0xfffff80102ee4780 (pid 46167, touch, tid 100213)
nlink=0, effnlink=0, size=0, dinode=NULL (fields omitted)
generation=0, uid=0, gid=0, flags=0x0
ino 3157390, on dev gpt/rootfs
db>
```