Hi ALL Why kamailio 3.1.2 generate core when function recvmsg return 0? Below is the trace of the core kamailio: May 27 10:29:14 sswpst00 /home2/local/kamailio/sbin/kamailio[31288]: INFO: <script>: CFG: Cseq INVITE ... May 27 10:29:14 sswpst00 /home2/local/kamailio/sbin/kamailio[31288]: DEBUG: tm [t_reply.c:1129]: ->>>>>>>>> T_code=100, new_code=488 May 27 10:29:14 sswpst00 /home2/local/kamailio/sbin/kamailio[31288]: DEBUG: tm [t_hooks.c:288]: DBG: trans=0xb61304a0, callback type 64, id 0 entered *May 27 10:29:15 sswpst00 /home2/local/kamailio/sbin/kamailio[31308]: : <core> [pass_fd.c:293]: ERROR: receive_fd: EOF on 11* May 27 10:29:15 sswpst00 /home2/local/kamailio/sbin/kamailio[31308]: DEBUG: <core> [tcp_main.c:3551]: DBG: handle_ser_child: dead child 1, pid 31288 (shutting down?) May 27 10:29:15 sswpst00 /home2/local/kamailio/sbin/kamailio[31308]: DEBUG: <core> [io_wait.h:617]: DBG: io_watch_del (0x82561e0, 11, -1, 0x0) fd_no=18 called *May 27 10:29:15 sswpst00 /home2/local/kamailio/sbin/kamailio[31285]: ALERT: <core> [main.c:741]: child process 31288 exited by a signal 11* May 27 10:29:15 sswpst00 /home2/local/kamailio/sbin/kamailio[31285]: ALERT: <core> [main.c:744]: core was generated May 27 10:29:15 sswpst00 /home2/local/kamailio/sbin/kamailio[31285]: INFO: <core> [main.c:756]: INFO: terminating due to SIGCHLD *May 27 10:29:15 sswpst00 /home2/local/kamailio/sbin/kamailio[31308]: INFO: <core> [main.c:807]: INFO: signal 15 received* May 27 10:29:15 sswpst00 /home2/local/kamailio/sbin/kamailio[31308]: DEBUG: <core> [main.c:818]: Memory status (pkg): Regards,