--- src/sys/kern/uipc_usrreq.c	2006/05/26 02:26:01	1.26
+++ src/sys/kern/uipc_usrreq.c	2006/09/02 16:52:54	1.26.2.1
@@ -1380,10 +1380,10 @@ unp_mark(struct file *fp, void *data)
 
 	if (info->locked_fp != fp)
 		spin_lock_wr(&fp->f_spin);
-	if (fp->f_flag & FMARK)
-		return;
-	++info->defer;
-	fp->f_flag |= (FMARK|FDEFER);
+	if ((fp->f_flag & FMARK) == 0) {
+		++info->defer;
+		fp->f_flag |= (FMARK|FDEFER);
+	}
 	if (info->locked_fp != fp)
 		spin_unlock_wr(&fp->f_spin);
 }