commit 35b1c016e3293480f87c49d5a53f7c59dcd16449
Author: Nick Hudson <skrll@netbsd.org>
Date:   Tue May 12 16:17:30 2026 +0100

    Enhance pmap_test_mod_ref to catch the mi pmap broken case

diff --git a/sys/uvm/pmap/pmap.c b/sys/uvm/pmap/pmap.c
index 54049af73988..4bd230cf00ac 100644
--- a/sys/uvm/pmap/pmap.c
+++ b/sys/uvm/pmap/pmap.c
@@ -2614,7 +2614,7 @@ pmap_test_mod_ref(void)
 	ref = pmap_is_referenced(pg);
 	exp_mod = false;
 	exp_ref = true;
-	printf("%s: ref val=%d: mod=%d(%d) ref=%d(%d) (%s)\n",
+	printf("%s: ref 1: val=%d: mod=%d(%d) ref=%d(%d) (%s)\n",
 	    __func__,
 	    val,
 	    mod, exp_mod, ref, exp_ref,
@@ -2639,6 +2639,19 @@ pmap_test_mod_ref(void)
 	    mod, exp_mod, ref, exp_ref,
 	    mod == exp_mod && ref == exp_ref ? "OK" : "FAIL");
 
+	/* reference page again */
+	val = *loc;
+
+	mod = pmap_is_modified(pg);
+	ref = pmap_is_referenced(pg);
+	exp_mod = false;
+	exp_ref = true;
+	printf("%s: ref 2: val=%d: mod=%d(%d) ref=%d(%d) (%s)\n",
+	    __func__,
+	    val,
+	    mod, exp_mod, ref, exp_ref,
+	    mod == exp_mod && ref == exp_ref ? "OK" : "FAIL");
+
 	/* modify page */
 	*loc = 0xff;