From cff8481de46274d41b3e4826387612c53b2e421f Mon Sep 17 00:00:00 2001
From: Jeff Roberson <jeff@FreeBSD.org>
Date: Sun, 8 Dec 2019 01:49:53 +0000
Subject: [PATCH] It is safe to wire a page while the object is busy.

Reviewed by:	kib, markj
Differential Revision:	https://reviews.freebsd.org/D22636
---
 sys/vm/vm_page.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index 7c7c02ec575..d85bc47e068 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -3803,7 +3803,7 @@ vm_page_wire(vm_page_t m)
 
 	KASSERT(m->object != NULL,
 	    ("vm_page_wire: page %p does not belong to an object", m));
-	if (!vm_page_busied(m))
+	if (!vm_page_busied(m) && !vm_object_busied(m->object))
 		VM_OBJECT_ASSERT_LOCKED(m->object);
 	KASSERT((m->flags & PG_FICTITIOUS) == 0 ||
 	    VPRC_WIRE_COUNT(m->ref_count) >= 1,