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[src/trunk]: src/sys/arch/x86/x86 PR port-amd64/55083 (assertion "pmap->pm_st...
details: https://anonhg.NetBSD.org/src/rev/cf3b874aeadc
branches: trunk
changeset: 849930:cf3b874aeadc
user: ad <ad%NetBSD.org@localhost>
date: Thu Mar 19 18:58:14 2020 +0000
description:
PR port-amd64/55083 (assertion "pmap->pm_stats.resident_count == PDP_SIZE" failed)
Reported-by: syzbot+2c1e17352173a60eec23%syzkaller.appspotmail.com@localhost
Don't screw up resident_count in failure path.
diffstat:
sys/arch/x86/x86/pmap.c | 9 ++++-----
1 files changed, 4 insertions(+), 5 deletions(-)
diffs (40 lines):
diff -r ebabaf93cac7 -r cf3b874aeadc sys/arch/x86/x86/pmap.c
--- a/sys/arch/x86/x86/pmap.c Thu Mar 19 15:19:13 2020 +0000
+++ b/sys/arch/x86/x86/pmap.c Thu Mar 19 18:58:14 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.377 2020/03/18 18:54:28 ad Exp $ */
+/* $NetBSD: pmap.c,v 1.378 2020/03/19 18:58:14 ad Exp $ */
/*
* Copyright (c) 2008, 2010, 2016, 2017, 2019, 2020 The NetBSD Foundation, Inc.
@@ -130,7 +130,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.377 2020/03/18 18:54:28 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.378 2020/03/19 18:58:14 ad Exp $");
#include "opt_user_ldt.h"
#include "opt_lockdebug.h"
@@ -2229,11 +2229,11 @@
{
int lidx;
- KASSERT(ptp->wire_count == 1);
+ KASSERT(ptp->wire_count <= 1);
PMAP_CHECK_PP(VM_PAGE_TO_PP(ptp));
lidx = level - 1;
- pmap_stats_update(pmap, -1, 0);
+ pmap_stats_update(pmap, -ptp->wire_count, 0);
if (pmap->pm_ptphint[lidx] == ptp)
pmap->pm_ptphint[lidx] = NULL;
ptp->wire_count = 0;
@@ -2450,7 +2450,6 @@
continue;
}
KASSERT(pt->pg[i]->wire_count == 0);
- pt->pg[i]->wire_count = 1;
PMAP_CHECK_PP(VM_PAGE_TO_PP(pt->pg[i]));
pmap_freepage(pmap, pt->pg[i], i - 1);
}
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