What happens if you add 
   PUTBACK;
   FREETMPS;                       /* free that return value        */
   LEAVE;                       /* ...and the XPUSHed "mortal" args.*/

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In reply to Re: XS: Passing an external library's function a Perl XS callback by Anonymous Monk
in thread SOLVED: XS: Passing an external library's function a Perl XS callback by stevieb

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