Just in addition to what BrowserUK said, if you are unable to modify the package causing the problem, then move it from a use statement in the parent thread to a require statement in the child threads - Chances are good this will resolve your issue (assuming you don't need access to the package in the main thread)

In reply to Re^3: segmentation fault issue while joining threads in perl by SimonPratt
in thread segmentation fault issue while joining threads in perl by userr_1

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