diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -556,7 +556,7 @@
 	char *list, *listend;
 	vm_paddr_t end, high_avail, low_avail, new_end, size;
 	vm_paddr_t page_range __unused;
-	vm_paddr_t last_pa, pa;
+	vm_paddr_t last_pa, pa, startp, endp;
 	u_long pagecount;
 #if MINIDUMP_PAGE_TRACKING
 	u_long vm_page_dump_size;
@@ -770,21 +770,22 @@
 			vm_page_init_page(m, pa, segind);
 
 		/*
-		 * Add the segment to the free lists only if it is covered by
-		 * one of the ranges in phys_avail.  Because we've added the
-		 * ranges to the vm_phys_segs array, we can assume that each
-		 * segment is either entirely contained in one of the ranges,
-		 * or doesn't overlap any of them.
+		 * Add the segment pages to the free lists when they
+		 * are covered by one of the ranges in phys_avail.
 		 */
 		for (i = 0; phys_avail[i + 1] != 0; i += 2) {
 			struct vm_domain *vmd;
 
 			if (seg->start < phys_avail[i] ||
-			    seg->end > phys_avail[i + 1])
+			    seg->start >= phys_avail[i + 1])
 				continue;
 
-			m = seg->first_page;
-			pagecount = (u_long)atop(seg->end - seg->start);
+			startp = MAX(seg->start, phys_avail[i]);
+			m = seg->first_page + atop(seg->start - startp);
+			endp = MIN(seg->end, phys_avail[i + 1]);
+			pagecount = (u_long)atop(endp - startp);
+			if (pagecount == 0)
+				continue;
 
 			vmd = VM_DOMAIN(seg->domain);
 			vm_domain_free_lock(vmd);