--- /n/sources/plan9/sys/src/9k/k10/trap.c	Tue Jun 16 13:38:31 2026
+++ /sys/src/9k/k10/trap.c	Tue Jun 16 13:38:31 2026
@@ -339,7 +339,7 @@ trap(Ureg* ureg)
 			if(ctl->irq == IdtPIC+IrqCLOCK || ctl->irq == IdtTIMER)
 				clockintr = 1;
 
-			if(up && !clockintr)
+			if(up && !clockintr && m->ilockdepth == 0)
 				preempted();
 		}
 	}
@@ -375,7 +375,7 @@ trap(Ureg* ureg)
 	splhi();
 
 	/* delaysched set because we held a lock or because our quantum ended */
-	if(up && up->delaysched && clockintr){
+	if(up && up->delaysched && clockintr && m->ilockdepth == 0){
 		sched();
 		splhi();
 	}