diff -r ed9a8f50c08f sys/src/9/pc/mmu.c
--- a/sys/src/9/pc/mmu.c	Sun Apr 05 03:46:47 2020 +0200
+++ b/sys/src/9/pc/mmu.c	Mon Apr 06 01:17:28 2020 +0200
@@ -524,8 +524,7 @@
 			panic("mmuwalk2: va %luX entry %luX", va, *table);
 		if(!(*table & PTEVALID)){
 			map = rampage();
-			if(map == nil)
-				panic("mmuwalk: page alloc failed");
+			memset(map, 0, BY2PG);
 			*table = PADDR(map)|PTEWRITE|PTEVALID;
 		}
 		table = KADDR(PPN(*table));