P_MAGIC
p->p_magic = P_MAGIC;
MPASS(td1->td_proc->p_magic == P_MAGIC);
MPASS(td->td_proc->p_magic == P_MAGIC);
MPASS(td->td_proc->p_magic == P_MAGIC);
MPASS(td->td_proc->p_magic == P_MAGIC);
MPASS(td1->td_proc->p_magic == P_MAGIC);
MPASS(owner->td_proc->p_magic == P_MAGIC);
MPASS(td->td_proc->p_magic == P_MAGIC);
MPASS(owner->td_proc->p_magic == P_MAGIC);
MPASS(curthread->td_proc->p_magic == P_MAGIC);
MPASS(td->td_proc->p_magic == P_MAGIC);
MPASS(curthread->td_proc->p_magic == P_MAGIC);