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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 6 Jan 2017 12:11:16 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org
Subject: svn commit: r311515 - stable/10/sys/vm
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Author: kib
Date: Fri Jan  6 12:11:16 2017
New Revision: 311515
URL: https://svnweb.freebsd.org/changeset/base/311515

Log:
  MFC r310834:
  Assert that the pages found on the object queue by vm_page_next() and
  vm_page_prev() have correct ownership.

Modified:
  stable/10/sys/vm/vm_page.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/vm/vm_page.c
==============================================================================
--- stable/10/sys/vm/vm_page.c	Fri Jan  6 11:49:13 2017	(r311514)
+++ stable/10/sys/vm/vm_page.c	Fri Jan  6 12:11:16 2017	(r311515)
@@ -1175,9 +1175,11 @@ vm_page_next(vm_page_t m)
 	vm_page_t next;
 
 	VM_OBJECT_ASSERT_WLOCKED(m->object);
-	if ((next = TAILQ_NEXT(m, listq)) != NULL &&
-	    next->pindex != m->pindex + 1)
-		next = NULL;
+	if ((next = TAILQ_NEXT(m, listq)) != NULL) {
+		MPASS(next->object == m->object);
+		if (next->pindex != m->pindex + 1)
+			next = NULL;
+	}
 	return (next);
 }
 
@@ -1193,9 +1195,11 @@ vm_page_prev(vm_page_t m)
 	vm_page_t prev;
 
 	VM_OBJECT_ASSERT_WLOCKED(m->object);
-	if ((prev = TAILQ_PREV(m, pglist, listq)) != NULL &&
-	    prev->pindex != m->pindex - 1)
-		prev = NULL;
+	if ((prev = TAILQ_PREV(m, pglist, listq)) != NULL) {
+		MPASS(prev->object == m->object);
+		if (prev->pindex != m->pindex - 1)
+			prev = NULL;
+	}
 	return (prev);
 }