**Updates:**

A few days ago we've got the same segfault on production server, but in this 
case it happened without shut down. I think there is a race when calling 
process_rpc_req function and it does not relate to server cooldown. 

**Core dump:**

GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /var/lib/ums/sbin/kamailio...done.
[New LWP 6226]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/var/lib/ums/sbin/kamailio -m 2048 -M 12 -P 
/var/run/kamailio/kamailio.pid -f /'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __strcmp_sse2_unaligned ()
    at ../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:32
#0  __strcmp_sse2_unaligned () at 
../sysdeps/x86_64/multiarch/strcmp-sse2-unaligned.S:32
#1  0x00007f327f55c2f5 in rpc_mod_print (rpc=0x7f327ee71540 <binrpc_callbacks>, 
ctx=0x7ffe1418a9b8, mname=0x1dca0c8 "tls", stats=0x1de5310, flag=2) at 
mod_stats.c:117
#2  0x00007f327f55c0eb in rpc_mod_print_one (rpc=0x7f327ee71540 
<binrpc_callbacks>, ctx=0x7ffe1418a9b8, mname=0x1dca0c8 "tls", 
pkg_stats=0x1de39d0, shm_stats=0x1de5310, flag=2) at mod_stats.c:159
#3  0x00007f327f55bee1 in rpc_mod_mem_stats_mode (rpc=0x7f327ee71540 
<binrpc_callbacks>, ctx=0x7ffe1418a9b8, fmode=0) at mod_stats.c:239
#4  0x00007f327f55b84f in rpc_mod_mem_stats (rpc=0x7f327ee71540 
<binrpc_callbacks>, ctx=0x7ffe1418a9b8) at mod_stats.c:251
#5  0x00007f327ec40c80 in process_rpc_req (buf=0x1dca0b4 
"\241\003\026F\270\067\r\221\nmod.stats", size=29, bytes_needed=0x7ffe1418ae00, 
sh=0x7ffe1418ad70, saved_state=0x1dda0b8) at binrpc_run.c:678
#6  0x00007f327ec2e72f in handle_stream_read (s_c=0x1dca080, idx=-1) at 
io_listener.c:511
#7  0x00007f327ec2a121 in handle_io (fm=0x7f3302c66cc0, events=1, idx=-1) at 
io_listener.c:706
#8  0x00007f327ec2893a in io_wait_loop_epoll (h=0x7f327ee71348 <io_h>, t=10, 
repeat=0) at ./../../core/io_wait.h:1062
#9  0x00007f327ec1c62c in io_listen_loop (fd_no=2, cs_lst=0x1cde940) at 
io_listener.c:281
#10 0x00007f327ec5272c in mod_child (rank=0) at ctl.c:338
#11 0x0000000000638c14 in init_mod_child (m=0x7f3302ae54b0, rank=0) at 
core/sr_module.c:780
#12 0x000000000063862d in init_mod_child (m=0x7f3302ae5b78, rank=0) at 
core/sr_module.c:776
#13 0x000000000063862d in init_mod_child (m=0x7f3302ae6018, rank=0) at 
core/sr_module.c:776
#14 0x000000000063862d in init_mod_child (m=0x7f3302ae6528, rank=0) at 
core/sr_module.c:776
#15 0x000000000063862d in init_mod_child (m=0x7f3302ae69c8, rank=0) at 
core/sr_module.c:776
#16 0x000000000063862d in init_mod_child (m=0x7f3302ae7140, rank=0) at 
core/sr_module.c:776
#17 0x000000000063862d in init_mod_child (m=0x7f3302ae77b0, rank=0) at 
core/sr_module.c:776
#18 0x000000000063862d in init_mod_child (m=0x7f3302ae7c38, rank=0) at 
core/sr_module.c:776
#19 0x00000000006385b2 in init_child (rank=0) at core/sr_module.c:825
#20 0x000000000043140c in main_loop () at main.c:1753
#21 0x000000000043df6f in main (argc=9, argv=0x7ffe1418f138) at main.c:2802


**Logs:**

2020-08-18T12:36:03.755718-07:00 hpbx031-1.va /var/lib/ums/sbin/kamailio[6204]: 
INFO: <script>: sip_call_id=9bf05e23-bdab-4c7e-93fd-975f1d27d...@hpbx031-1.va; 
Received ACK in a dialog
2020-08-18T12:36:03.755756-07:00 hpbx031-1.va /var/lib/ums/sbin/kamailio[6204]: 
INFO: <script>: sip_call_id=9bf05e23-bdab-4c7e-93fd-975f1d27d...@hpbx031-1.va; 
Relaying ACK from b2bua to sip:54171324@127.0.0.1:5060
2020-08-18T12:36:03.757855-07:00 hpbx031-1.va /var/lib/ums/sbin/kamailio[6197]: 
INFO: <script>: [75229096,R,0_1478685494]: Received, method: REGISTER, R-URI: 
sip:hpbx031.telecomsvc.com:5060, ct: <sip:75229096@192.168.10.116:5100>, cseq: 
14166, s-ip: 74.89.64.126, s-port: 5100
2020-08-18T12:37:29.073600-07:00 hpbx031-1.va /var/lib/ums/sbin/kamailio[6193]: 
INFO: <core> [core/sctp_core.c:53]: sctp_core_destroy(): SCTP API not 
initialized
2020-08-18T12:37:39.583593-07:00 hpbx031-1.va kamailio: INFO: <core> 
[core/sctp_core.c:75]: sctp_core_check_support(): SCTP API not enabled - if you 
want to use it, load sctp module
2020-08-18T12:37:39.780830-07:00 hpbx031-1.va kamailio: INFO: <core> 
[core/tcp_main.c:5043]: init_tcp(): using epoll_lt as the io watch method (auto 
detected)
2020-08-18T12:37:39.781363-07:00 hpbx031-1.va kamailio[23718]: loading modules 
under config path: /var/lib/ums/lib64/kamailio/modules/
2020-08-18T12:37:39.781546-07:00 hpbx031-1.va kamailio[23718]: Listening on







  

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