When reporting problems with modules, report version numbers, use
Devel::Modlist like
$ perl -d:Modlist -e "use CGI;"
CGI 3.51
CGI::Util 3.51
Carp 1.11
Exporter 5.63
constant 1.19
overload 1.07
vars 1.01
warnings 1.06
warnings::register 1.01
Now, looking at the source of
Archive::Tar::Streamed, there is literally nothing to it, its barely 45 lines, and it hasn't been updated since 2005, while Archive::Tar has on 18 Dec 2010.
I would ask the Archive::Tar maintainer to review Archive::Tar::Streamed, he should be able to tell instantly if syswrite $self->{file}, $tf, length($tf) - (BLOCK * 2); makes sense :)