This might be the same that happens in Perl bug #77854, as detailed on Google Groups. Maybe 5.10 has a bug there, or it depends on libpthreads. dave_the_m commented that he can't reproduce the problem on 5.10 or 5.12, so it might be interesting to see whether you can reproduce the problem on 5.12 (or bleadperl) too.

In reply to Re: Strange memory leak using just threads by Corion
in thread Strange memory leak using just threads by MnkyBrain

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