The problem is with one of the tests which tries to extract a very long file and relates to a bug in encryptfs

We had a ticket for this and Colin Newell kindly patched the test to provide heuristics for the long file test, which was released as version 1.68 of Archive::Tar.

This has been added to blead perl, the development version of perl, and has been part of perl monthly development releases since v5.13.4 and will be part of the upcoming v5.14.0 stable release.