So, this is a mystery... I'd look at /usr/lib/perl5/site_perl/5.8.8/Data/Serializer.pm line 597 and start tracing back from there. The later messages may or may not be the consequence of the first unitialised value.

I had a quick look at the current version (Data::Serializer v0.48) on CPAN. Around line 597 I see:

  592:  sub _get_token {
  593:    my $self = (shift);
  594:    my $line = (shift);
  595:    #Should be anchored to beginning
  596:    #my ($token) =  $line =~ /\^([^\^]+?)\^/;
  597:    my ($token) =  $line =~ /^\^([^\^]{1,120}?)\^/;
  598:    return $token;
  599:  }

[download]
so, if that's the version you're using, it appears that $line is undefined. Seems that _get_token is used only in deserialize(), where it operates on its first argument (after $self), so:
  my $self = (shift);

  if ($self->raw) {
    return $self->raw_deserialize(@_);
  }

  my $value = (shift);
  my $token = $self->_get_token($value);

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I see that deserialise() is used in a number of places...

I would force the initial warning to confess (eg: local $SIG{__WARN__} = sub { confess(@_) };) and see what the stack traceback tells me.

In reply to Re: Magic number checking on storable string failed by gone2015
in thread Magic number checking on storable string failed by shanu_040

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