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Index: head/sys/kern/kern_exit.c
===================================================================
--- head/sys/kern/kern_exit.c
+++ head/sys/kern/kern_exit.c
@@ -285,6 +285,15 @@
wakeup(&p->p_stype);
/*
+ * If P_PPWAIT is set our parent holds us with p_lock and may
+ * be waiting on p_pwait.
+ */
+ if (p->p_flag & P_PPWAIT) {
+ p->p_flag &= ~P_PPWAIT;
+ cv_broadcast(&p->p_pwait);
+ }
+
+ /*
* Wait for any processes that have a hold on our vmspace to
* release their reference.
*/
@@ -329,13 +338,9 @@
*/
EVENTHANDLER_DIRECT_INVOKE(process_exit, p);
- /*
- * If parent is waiting for us to exit or exec,
- * P_PPWAIT is set; we will wakeup the parent below.
- */
PROC_LOCK(p);
stopprofclock(p);
- p->p_flag &= ~(P_TRACED | P_PPWAIT | P_PPTRACE);
+ p->p_flag &= ~(P_TRACED | P_PPTRACE);
p->p_ptevents = 0;
/*
@@ -636,7 +641,6 @@
* proc lock.
*/
wakeup(p->p_pptr);
- cv_broadcast(&p->p_pwait);
sched_exit(p->p_pptr, td);
PROC_SLOCK(p);
p->p_state = PRS_ZOMBIE;
Index: head/sys/kern/kern_fork.c
===================================================================
--- head/sys/kern/kern_fork.c
+++ head/sys/kern/kern_fork.c
@@ -725,6 +725,7 @@
*/
_PHOLD(p2);
if (fr->fr_flags & RFPPWAIT) {
+ _PHOLD(p2);
td->td_pflags |= TDP_RFPPWAIT;
td->td_rfppwait_p = p2;
td->td_dbgflags |= TDB_VFORK;
Index: head/sys/kern/subr_syscall.c
===================================================================
--- head/sys/kern/subr_syscall.c
+++ head/sys/kern/subr_syscall.c
@@ -257,6 +257,7 @@
}
cv_timedwait(&p2->p_pwait, &p2->p_mtx, hz);
}
+ _PRELE(p2);
PROC_UNLOCK(p2);
if (td->td_dbgflags & TDB_VFORK) {

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