[SR-Users] 4.4.4 CPU 100%

Hi all, I’ve been using Kamailio 4.4.4 for 8 months without any problems but in recent days, I’m having some issues with our server and, when it happens, it cannot get new registrations. Using top I saw a kamailio process is eating all CPU. PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1556 kamailio 20 0 1010884 27624 24520 R 98.5 1.4 150:07.59 kamailio I got backtrace attaching to Kamailio with gdb. Here is the backtrace: #0 0x00007fb996992d6d in accept () at ../sysdeps/unix/syscall-template.S:81 #1 0x00000000005f3615 in handle_new_connect (si=0x7fb9960b4fa8) at tcp_main.c:3894 #2 0x00000000005f7029 in handle_io (fm=0x7fb9961da520, ev=1, idx=-1) at tcp_main.c:4199 #3 0x00000000005c68b2 in io_wait_loop_epoll (h=0xa1fdc0 <io_h>, t=5, repeat=0) at io_wait.h:1065 #4 0x00000000005fa04a in tcp_main_loop () at tcp_main.c:4490 #5 0x00000000004b48ba in main_loop () at main.c:1712 #6 0x00000000004bad12 in main (argc=13, argv=0x7ffd14247c18) at main.c:2631 (gdb) bt At the moment I found the issue, there were 862 sip client registered correctly. Our server is configured to use only TLS and mysql as backend. /usr/local/sbin/kamailio -v version: kamailio 4.4.4 (x86_64/linux) 852c47 flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: 852c47 compiled on 15:56:18 Dec 15 2016 with gcc 4.8.4 Can anyone address me to find out why this happens? Many thanks, T. Tomas Zanet R&D Software designer tzanet(a)came.com CAME S.p.A.