I have tried $x = $x instead of $x =||....Nothing happened.

right -- cause they're effectively the same, except one is more confusing to see

   I have dumped ctime, atime, mtime,...did not show anything different (i.e it crashes in exat area where the script does)!!!

what is the exact (read: copy past for us please) output if you add this:

use Data::Dumper;
print Dumper $sb;
print Dumper $ct;
print Dumper $mt;
print Dumper $at;
[download]

   Will I still get help from the OPEN SOURCE community on PerlMOnks???????????

Yes, but in order to help us help you, please carefully review the node How (Not) To Ask A Question (especially this part)