diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
index 2aa21238d514..974c54039962 100644
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -3302,7 +3302,10 @@ resource_list_alloc(struct resource_list *rl, device_t bus, device_t child,
 			rle->flags |= RLE_ALLOCATED;
 			return (rle->res);
 		}
-		panic("resource_list_alloc: resource entry is busy");
+		device_printf(bus,
+		    "resource entry %#x type %d for child %s is busy\n", *rid,
+		    type, device_get_nameunit(child));
+		return (NULL);
 	}
 
 	if (isdefault) {