update + workaround replace_body_atonce function is very similar to replace_body_all but is replace_body_atonce is defined to use fixup_regexpNL_none for incoming parameters processing. Apparantly something in fixup_regexpNL_none is causing the issue because when I change definition for replace_body_atonce to use fixup_regexp_none (just like its "sister" function replace_body_all) everything is working fine and no crash. I am not sure about significance of fixup_regexpNL_none as it is not used by any other function but replace_body_atonce however, as workaround I ended up utilizing replace_body_all for my search + replace needs. As far as fixup_regexpNL_none; I see it uses regcomp but I do not see a call to regfee... So that is might be the root cause of the memory issue. -----Original Message----- From: denis(a)dilvest.com [mailto:denis@dilvest.com] Sent: Wednesday, June 17, 2015 4:59 PM To: &#39;sr-dev(a)lists.sip-router.org&#39; Subject: RE: Kamailio crashes when using replace_body_atonce from Textops upon further tracing it looks like crash happens in action.c MODF_RVE_PARAM_FREE when calling pkg_free((dst)[i+2].u.data); -----Original Message----- From: denis(a)dilvest.com [mailto:denis@dilvest.com] Sent: Wednesday, June 17, 2015 1:25 PM To: &#39;sr-dev(a)lists.sip-router.org&#39; Subject: Kamailio crashes when using replace_body_atonce from Textops Hi, Need some help resolving Kamailio crash. Kamailio version 4.1 on Centos (uname -r "Linux 2.6.18-164.11.1.el5") The issue: I want to replace text in the message body using replace_body_atonce from TextOps module Works fine when called like: replace_body_atonce("123456789","000"); Works fine when called like: $var(replacewith)="000"; replace_body_atonce("123456789",$var(replacewith)); However, Kamailio crashes when called like $var(findwhat)="123456789"; $var(replacewith)="000"; replace_body_atonce($var(findwhat),$var(replacewith)); The following is in the log Jun 17 16:21:08 tms /usr/local/sbin/kamailio[18614]: ERROR: textops [textops.c:570]: do_replace_body_f(): exit Jun 17 16:21:08 tms /usr/local/sbin/kamailio[18614]: : <core> [mem/q_malloc.c:454]: qm_free(): BUG: qm_free: bad pointer 0xc0c0c0c0 (out of memory block!) called from <core>: action.c: do_action(1164) - aborting Jun 17 16:21:08 tms /usr/local/sbin/kamailio[18612]: ALERT: <core> [main.c:778]: handle_sigs(): child process 18614 exited by a signal 6 Jun 17 16:21:08 tms /usr/local/sbin/kamailio[18612]: ALERT: <core> [main.c:781]: handle_sigs(): core was not generated For some reason no core dump is generated ( i have tried "ulimit -c unlimited" and "echo "1" > /proc/sys/kernel/core_uses_pid"). However, I added log entry right before replace_body_atonce returns and I do see that replace_body_atonce completes and returns but then crashes. I can easily reproduce the issue. Please let me know if you have some suggestion to try (even in the code as I can recompile it). Thanks, Denis