Index: sys/vm/uma_core.c
===================================================================
--- sys/vm/uma_core.c	(revision 221870)
+++ sys/vm/uma_core.c	(working copy)
@@ -935,6 +935,7 @@
 	keg = zone_first_keg(zone);
 	pages = howmany(bytes, PAGE_SIZE);
 	check_pages = pages - 1;
+	printf("Checkpoint 1, check_pages=%d, pages=%d\n", check_pages, pages);
 	KASSERT(pages > 0, ("startup_alloc can't reserve 0 pages\n"));
 
 	/*
@@ -946,6 +947,7 @@
 	tmps = LIST_FIRST(&uma_boot_pages);
 	while (tmps != NULL && check_pages-- > 0)
 		tmps = LIST_NEXT(tmps, us_link);
+	printf("Checkpoint 2, tmps=%p, check_pages=%d\n", tmps, check_pages);
 	if (tmps != NULL) {
 		/*
 		 * It's ok to lose tmps references.  The last one will
@@ -957,10 +959,12 @@
 			LIST_REMOVE(tmps, us_link);
 		}
 		mtx_unlock(&uma_boot_pages_mtx);
+		printf("Checkpoint 3, tmps=%p, pages=%d\n", tmps, pages);
 		*pflag = tmps->us_flags;
 		return (tmps->us_data);
 	}
 	mtx_unlock(&uma_boot_pages_mtx);
+	printf("Checkpoint 4, tmps=%p, booted=%d\n", tmps, booted);
 	if (booted == 0)
 		panic("UMA: Increase vm.boot_pages");
 	/*