<p>The kamailio logs at the time of the crash:</p>
<p>2016-12-21T16:59:06.281803+09:00 IPX182 /usr/local/src/git/kamailio-4.1/kamailio[11158]: :  [msg_translator.c:2316]: build_res_buf_from_sip_req(): BUG:build_res_from_sip_req: diff len=420 p-buf=415<br>
2016-12-21T16:59:07.269816+09:00 IPX182 /usr/local/src/git/kamailio-4.1/kamailio[11158]: :  [msg_translator.c:2316]: build_res_buf_from_sip_req(): BUG:build_res_from_sip_req: diff len=420 p-buf=415<br>
2016-12-21T16:59:09.268711+09:00 IPX182 /usr/local/src/git/kamailio-4.1/kamailio[11156]: :  [msg_translator.c:2316]: build_res_buf_from_sip_req(): BUG:build_res_from_sip_req: diff len=420 p-buf=415<br>
2016-12-21T16:59:13.266974+09:00 IPX182 /usr/local/src/git/kamailio-4.1/kamailio[11157]: :  [msg_translator.c:2316]: build_res_buf_from_sip_req(): BUG:build_res_from_sip_req: diff len=420 p-buf=415<br>
2016-12-21T16:59:27.500692+09:00 IPX182 /usr/local/src/git/kamailio-4.1/kamailio[11154]: ALERT:  [main.c:775]: handle_sigs(): child process 11157 exited by a signal 11<br>
2016-12-21T16:59:27.500826+09:00 IPX182 /usr/local/src/git/kamailio-4.1/kamailio[11154]: ALERT:  [main.c:778]: handle_sigs(): core was generated</p>
<p>That build_res_buf_from_sip_req BUG happens about 6 thousand times a day so I don't think it directly caused the crash unless by cumulative effect (we are running without issues for almost one year).</p>
<p>About parameter -x, I checked the code (main.c) and I understand this was not backported to previous versions. So I need to upgrade to 4.4 anyway.</p>

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