crhold
thread0.td_ucred = crhold(p->p_ucred); /* bootstrap fork1() */
crhold(cred);
sigio->sio_ucred = crhold(curthread->td_ucred);
crhold(ncr);
p2->p_ucred = crhold(lp1->lwp_thread->td_ucred);
td2->td_ucred = crhold(destproc->p_ucred);
td->td_ucred = crhold(proc0.p_ucred);
crhold(cr);
so->so_cred = crhold(p->p_ucred);
sp->so_cred = crhold(head_inh->so_cred); /* non-blocking */
so->so_cred = crhold(head->so_cred);
nd->nl_cred = crhold(cred);
nd->nl_cred = crhold(cred);
cred = crhold(cred);
cred = crhold(nd.nl_cred);
mp->mnt_cred = crhold(cred); /* For cr_prison */
lp2->lwp_thread->td_ucred = crhold(proc0.p_ucred);
ncred = crhold(curp->p_ucred);
ncred = crhold(curp->p_ucred);
struct ucred *crhold (struct ucred *cr);
fmp->cred = crhold(cred);
cred = crhold(cred);
nmp->nm_cred = crhold(proc0.p_ucred);
cred = crhold(ap->a_cred);
cred = crhold(ap->a_cred);
smp->sm_cred = crhold(cred);
np->n_cached_cred = crhold(ap->a_cred);
np->n_cached_cred = crhold(ap->a_cred);
ump->um_cred[type] = crhold(cred);