diff -urNp N/snmplib/snmpusm.c M/snmplib/snmpusm.c

--- N/snmplib/snmpusm.c	2019-03-04 13:02:27.989775985 +0100

+++ M/snmplib/snmpusm.c	2019-03-04 14:16:50.977619867 +0100

@@ -1842,7 +1842,7 @@ usm_rgenerate_out_msg(int msgProcModel,

     /*

      * endif -- create keyed hash 

      */

-    usm_free_usmStateReference(secStateRef);

+//    usm_free_usmStateReference(secStateRef);

     DEBUGMSGTL(("usm", "USM processing completed.\n"));

     return SNMPERR_SUCCESS;

 }                               /* end usm_rgenerate_out_msg() */