From upstream. http://groups.yahoo.com/group/amanda-hackers/message/4510
--- amanda-2.5.0p2/server-src/amverify.sh.in.orig	2006-03-28 23:10:06.000000000 +0200
+++ amanda-2.5.0p2/server-src/amverify.sh.in	2006-06-25 02:23:46.000000000 +0200
@@ -432,14 +432,16 @@
 		fi
 		RESULT=`$AMRESTORE -h -p $DEVICE 2> $TEMP/amrestore.out \
 			| doonefile 2> $TEMP/onefile.errors`
+		# save previous filename to detect looping
+		FILE_prev="$FILE"
 		FILE=`grep restoring $TEMP/amrestore.out \
 			| sed 's/^.*restoring //'`
 		EOF=`grep "reached end of tape" $TEMP/amrestore.out`
 		EOI=`grep "reached end of information" $TEMP/amrestore.out`
 		# amrestore:   0: restoring sundae._mnt_sol1_usr.19961127.1
-		if [ X"$FILE" != X"" -a X"$RESULT" = X"0" ]; then
+		if [ X"$FILE" != X"" -a X"$FILE" != X"$FILE_prev" -a X"$RESULT" = X"0" ]; then
 			report "Checked $FILE"
-		elif [ X"$FILE" != X"" -a X"$RESULT" = X"500" ]; then
+		elif [ X"$FILE" != X"" -a X"$FILE" != X"$FILE_prev" -a X"$RESULT" = X"999" ]; then
 			report "Skipped `cat $TEMP/onefile.cmd` check on partial dump $FILE"
 			dump="`echo $FILE | cut -d'.' -f'1,2,3,4'`"
 			cat $TEMP/onefile.partnum >> $TEMP/$dump.parts