TDB_STOPATFORK
if (td->td_dbgflags & TDB_STOPATFORK) {
td->td_dbgflags &= ~TDB_STOPATFORK;
td2->td_dbgflags |= TDB_STOPATFORK;
if ((td->td_dbgflags & TDB_STOPATFORK) != 0) {
td->td_dbgflags &= ~TDB_STOPATFORK;