Hello Rick,   it might be related to a bug in tm. On which version of 5.3.x you are seeing these crashes? Already tried to upgrade to the latest 5.3.x version?   Cheers,   Henning   -- Henning Westerholt – https://skalatan.de/blog/ <https://skalatan.de/blog/> Kamailio services – https://gilawa.com <https://gilawa.com/>   *From:* sr-dev &lt;sr-dev-bounces(a)lists.kamailio.org&gt; *On Behalf Of *Rick Barenthin *Sent:* Tuesday, April 20, 2021 11:23 AM *To:* sr-dev(a)lists.kamailio.org *Subject:* [sr-dev] Crashes because of mixed shm and pkg in kamailio   Hi everyone,   We have seen some crashes in kamailio version 5.3 which happens in some modules who are getting the request for a reply from the transaction by the tm module export and try to parse extra header in this request by the parser functions. This seems to create a mix of shm with pkg which lead to a crash in retransmission. My question is, is there a way to make sure that there is no mix of shm and pkg or is the parsing on the message from the transaction not a planned way of usage?   Best regards Rick _______________________________________________ Kamailio (SER) - Development Mailing List sr-dev(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-dev