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```
[root@freebsd-main ~]# dtrace -n 'fbt::dev_ref:entry {printf("[%s]: invoke
dev_ref: %s, refcount:%d", execname, args[0]->si_name, args[0]->si_refcount=
)}'
dtrace: description 'fbt::dev_ref:entry ' matched 1 probe
CPU ID FUNCTION:NAME
1 43845 dev_ref:entry [sshd]: invoke dev_ref: hpet0,
refcount:11
0 43845 dev_ref:entry [sshd]: invoke dev_ref: hpet0,
refcount:12
0 43845 dev_ref:entry [bash]: invoke dev_ref: hpet0,
refcount:13
1 43845 dev_ref:entry [resizewin]: invoke dev_ref: hp=
et0,
refcount:14
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:15
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:16
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:17
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:18
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:19
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:20
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:21
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:22
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:23
1 43845 dev_ref:entry [sysctl]: invoke dev_ref: hpet0,
refcount:24
1 43845 dev_ref:entry [sh]: invoke dev_ref: hpet0,
refcount:25
1 43845 dev_ref:entry [atrun]: invoke dev_ref: hpet0,
refcount:26
```
this cdev->si_refcount leak might have kernel panic risk if enable KASSERT(=
),
see dev_rel()
```
void
dev_rel(struct cdev *dev)
{
int flag =3D 0;
dev_lock_assert_unlocked();
dev_lock();
dev->si_refcount--;
KASSERT(dev->si_refcount >=3D 0,
("dev_rel(%s) gave negative count", devtoname(dev)));
if (dev->si_devsw =3D=3D NULL && dev->si_refcount =3D=3D 0) {
LIST_REMOVE(dev, si_list);
flag =3D 1;
}
dev_unlock();
if (flag)
devfs_free(dev);
}
```
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