diff -Nuar --exclude '*~' munin-1.3.2.orig/node/node.d.linux/iostat_ios.in munin-1.3.2/node/node.d.linux/iostat_ios.in
--- munin-1.3.2.orig/node/node.d.linux/iostat_ios.in	2005-04-15 13:29:18.000000000 -0700
+++ munin-1.3.2/node/node.d.linux/iostat_ios.in	2006-07-11 02:05:50.618754305 -0700
@@ -53,12 +53,16 @@
 
 sub filter {
     my ($major, $minor, $tmpnam);
-    return 0 if ($major ==   1); # RAM devices
-    return 0 if ($major ==   9); # MD devices
-    return 0 if ($major ==  58); # LVM devices
-    return 0 if ($major == 254); # LVM2 devices
-    return 0 if ($tmpnam =~ /part\d+$/);
-    return 0 if ($tmpnam =~ /^\s*(?:sd|hd)[a-z]\d+\s*$/);
+	if(defined($major)) {
+		return 0 if ($major ==   1); # RAM devices
+		return 0 if ($major ==   9); # MD devices
+		return 0 if ($major ==  58); # LVM devices
+		return 0 if ($major == 254); # LVM2 devices
+	}
+	if(defined($tmpnam)) {
+		return 0 if ($tmpnam =~ /part\d+$/);
+		return 0 if ($tmpnam =~ /^\s*(?:sd|hd)[a-z]\d+\s*$/);
+	}
 
     return 1;
 }