Yep, your test program works for me also.

Make sure you're using the latest version of libwww. In particular, libwww-perl-5.800 has a known threads related crash (RT #6781), which was not libwww's fault but a consequence of core sort bug #30333. See also:

In reply to Re^2: error message "Free to wrong pool 2227b8 not 3d5a2aa0" being returned by eyepopslikeamosquito
in thread error message "Free to wrong pool 2227b8 not 3d5a2aa0" being returned by greenrob

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