rwlock_ownerpid
ultos((uint64_t)rcopy.rwlock_ownerpid, 10,
rwlp->rwlock_ownerpid = udp->pid;
rwlp->rwlock_ownerpid = 0;
rwlp->rwlock_ownerpid == self->ul_uberdata->pid));
rwlp->rwlock_ownerpid = udp->pid;
generic_so.rwlock.rwlock_ownerpid;