[Yaffs] Is it the yaffs2 bug with yaffs_iterate ?

The test.sh ：

#!/bin/bash

echo $1
if [ $1 == "" ];then

         echo $1 is null
         return;
fi

mkdir $1
test_count=0
while [ 1 ]
do

test_count=$(( test_count + 1 ))

touch $1/$test_count
echo $1/$test_count
if [ $test_count -eq 5000 ]; then
         return;
fi

done


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we can run it:
./test.sh /mnt/yaffs2/testdir

and then

cd /mnt/yaffs2
rm -rf testdir

rm: can't remove 'testdir': Directory not empty