mod_perl doesn't have to use threads (it usually doesn't, in my experience -- but "ActivePerl" might imply MS Windows which might mean Apache is more likely to be configured to use threads). Even if mod_perl uses threads, that doesn't need to mean that it lets its instances of Perl bounce between threads. So it doesn't need to mean any Perl stuff has to be thread safe.
But I find that people are often confused about these issues (like insisting that one needs to build a threaded Perl to embed it into a threaded application, even when I know the application doesn't share Perl instances between threads). So maybe mod_perl (stupidly) shares Perl instances between threads and this causes your problem.
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