diff --git a/sys/src/9/port/alarm.c b/sys/src/9/port/alarm.c
index d500a68e4..b78088665 100644
--- a/sys/src/9/port/alarm.c
+++ b/sys/src/9/port/alarm.c
@@ -13,6 +13,9 @@ alarmkproc(void*)
 	Proc *rp;
 	ulong now;
 
+	while(waserror())
+		;
+
 	for(;;){
 		now = MACHP(0)->ticks;
 		qlock(&alarms);
diff --git a/sys/src/9/port/devaoe.c b/sys/src/9/port/devaoe.c
index 0512f7016..a583ed4f3 100644
--- a/sys/src/9/port/devaoe.c
+++ b/sys/src/9/port/devaoe.c
@@ -701,8 +701,10 @@ loop:
 	}
 	runlock(&devs);
 	i = Nms - TK2MS(Ticks - starttick);
-	if(i > 0)
+	if(i > 0 && !waserror()){
 		tsleep(&up->sleep, return0, 0, i);
+		poperror();
+	}
 	goto loop;
 }
 
diff --git a/sys/src/9/port/devsdp.c b/sys/src/9/port/devsdp.c
index a205be87a..2be928d66 100644
--- a/sys/src/9/port/devsdp.c
+++ b/sys/src/9/port/devsdp.c
@@ -908,6 +908,8 @@ sdpackproc(void *a)
 	int i;
 	Conv *c;
 
+	while(waserror())
+		;
 	for(;;) {
 		tsleep(&up->sleep, return0, 0, 1000);
 		sec = TK2SEC(m->ticks);
diff --git a/sys/src/9/port/devsegment.c b/sys/src/9/port/devsegment.c
index 2606cb8ac..e9806e933 100644
--- a/sys/src/9/port/devsegment.c
+++ b/sys/src/9/port/devsegment.c
@@ -530,6 +530,8 @@ segmentkproc(void *arg)
 	incref(g->s);
 	up->seg[sno] = g->s;
 
+	while(waserror())
+		;
 	for(done = 0; !done;){
 		sleep(&g->cmdwait, cmdready, g);
 		if(waserror()){
@@ -554,6 +556,8 @@ segmentkproc(void *arg)
 		g->cmd = Cnone;
 		wakeup(&g->replywait);
 	}
+
+	pexit("done", 1);
 }
 
 Dev segmentdevtab = {
diff --git a/sys/src/9/port/random.c b/sys/src/9/port/random.c
index 3a697827a..f578d68cc 100644
--- a/sys/src/9/port/random.c
+++ b/sys/src/9/port/random.c
@@ -42,10 +42,11 @@ genrandom(void*)
 	up->basepri = PriNormal;
 	up->priority = up->basepri;
 
+	while(waserror())
+		;
 	for(;;){
-		for(;;)
-			if(++rb.randomcount > 100000)
-				break;
+		if(++rb.randomcount <= 100000)
+			continue;
 		if(anyhigher())
 			sched();
 		if(!rbnotfull(0))
diff --git a/sys/src/9/port/swap.c b/sys/src/9/port/swap.c
index 5c1d449bb..0340d566b 100644
--- a/sys/src/9/port/swap.c
+++ b/sys/src/9/port/swap.c
@@ -147,12 +147,11 @@ pager(void *junk)
 	Segment *s;
 	Proc *p, *ep;
 
-	if(waserror())
-		panic("pager: os error");
-
 	p = proctab(0);
 	ep = &p[conf.nproc];
 
+	while(waserror())
+		;
 loop:
 	up->psstate = "Idle";
 	wakeup(&palloc.r);
diff --git a/sys/src/9/port/usbehci.c b/sys/src/9/port/usbehci.c
index 0cdffb750..66546675c 100644
--- a/sys/src/9/port/usbehci.c
+++ b/sys/src/9/port/usbehci.c
@@ -2225,6 +2225,8 @@ ehcipoll(void* a)
 	hp = a;
 	ctlr = hp->aux;
 	poll = &ctlr->poll;
+	while(waserror())
+		;
 	for(;;){
 		if(ctlr->nreqs == 0){
 			if(0)ddprint("ehcipoll %#p sleep\n", ctlr->capio);