I prefer to try to find exact reason
In that case you're going to need to become an expert in the internals of perl and do a lot of C level debugging. I'd strongly recommend before you go that route, of trying to
reduce your code to a managable size, and in particular,
to eliminate as many external dependencies as possible. At that point you will either have eliminated all XS-based modules (so the bug is in perl), or will have found out which XS module has the bug. Trying with with newer versions of perl or the module will show whether the bug has been fixed (in which case you can bisect to see what patch fixed the issue), or if the bug is still present, will show you who to notify.
Dave.
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