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From: Kip Macy <kmacy@FreeBSD.org>
Date: Fri, 30 Apr 2010 02:46:49 +0000 (UTC)
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Subject: svn commit: r207412 - head/sys/vm
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Author: kmacy
Date: Fri Apr 30 02:46:49 2010
New Revision: 207412
URL: http://svn.freebsd.org/changeset/base/207412

Log:
  don't allow unsynchronized free in vm_page_unhold

Modified:
  head/sys/vm/vm_page.c

Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c	Fri Apr 30 02:35:46 2010	(r207411)
+++ head/sys/vm/vm_page.c	Fri Apr 30 02:46:49 2010	(r207412)
@@ -563,8 +563,11 @@ vm_page_unhold(vm_page_t mem)
 	vm_page_lock_assert(mem, MA_OWNED);
 	--mem->hold_count;
 	KASSERT(mem->hold_count >= 0, ("vm_page_unhold: hold count < 0!!!"));
-	if (mem->hold_count == 0 && VM_PAGE_INQUEUE2(mem, PQ_HOLD))
+	if (mem->hold_count == 0 && VM_PAGE_INQUEUE2(mem, PQ_HOLD)) {
+		vm_page_lock_queues();
 		vm_page_free_toq(mem);
+		vm_page_unlock_queues();
+	}
 }
 
 /*