28 Jun
2017
28 Jun
'17
5:50 p.m.
### Description
Kamailio suddenly stops working (this is a production server so debug logging is
disabled), when we restart it a core is generated and a segfault is logged.
### Troubleshooting
The only thing I have seen is some reference to IPv6 in the backtrace. But no idea where
to start looking. I'm pretty sure we will need more information, but I don't know
how to read or understand backtraces, please let me know what you see in it so I can dig
deeper into this problem.
#### Reproduction
I don't know how to reproduce yet, first I have to understand the cause.
#### Debugging Data
Backtrace:
```
[New LWP 12052]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/sbin/kamailio -P /var/run/kamailio/kamailio.pid -f
/etc/kamailio/sbc.cfg -'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007efcf3b5df69 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
#0 0x00007efcf3b5df69 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
No symbol table info available.
#1 0x00007efcf3b5e234 in OPENSSL_cleanup () from
/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
No symbol table info available.
#2 0x00007efcf7721910 in __run_exit_handlers (status=0, listp=0x7efcf7a855d8
<__exit_funcs>, run_list_atexit=run_list_atexit@entry=true,
run_dtors=run_dtors@entry=true) at exit.c:83
atfct = <optimized out>
onfct = <optimized out>
cxafct = <optimized out>
f = <optimized out>
#3 0x00007efcf772196a in __GI_exit (status=<optimized out>) at exit.c:105
No locals.
#4 0x000055f0a9483d54 in handle_sigs () at main.c:699
chld = 845005216
chld_status = 845005248
any_chld_stopped = 32766
memlog = 0
__func__ = "handle_sigs"
#5 0x000055f0a948ea43 in main_loop () at main.c:1758
i = 8
pid = 12091
si = 0x0
si_desc = "udp receiver child=7
sock=[2602:FF37:0:1:0:0:C601:377A]:5060\000\367v\215\200\262+\363\372~\000\000\025\067\236\003\000\000\000\000\300\017H\251\360U\000\000\340\305]2\376\177",
'\000' <repeats 18 times>,
"\020\303]2\376\177\000\000a\202g\251\360U\000"
nrprocs = 8
woneinit = 1
__func__ = "main_loop"
#6 0x000055f0a9494fb9 in main (argc=13, argv=0x7ffe325dc5e8) at main.c:2646
cfg_stream = 0x55f0aa7fb010
c = -1
r = 0
tmp = 0x7ffe325dceb6 ""
tmp_len = -133383536
port = 32508
proto = 845006016
options = 0x55f0a97d80e8
":f:cm:M:dVIhEeb:l:L:n:vKrRDTN:W:w:t:u:g:P:G:SQ:O:a:A:x:X:Y:"
ret = -1
seed = 3679304743
rfd = 4
debug_save = 0
debug_flag = 0
dont_fork_cnt = 0
n_lst = 0x0
p = 0xffffffff <error: Cannot access memory at address 0xffffffff>
st = {st_dev = 19, st_ino = 14769, st_nlink = 2, st_mode = 16832, st_uid = 109,
st_gid = 113, __pad0 = 0, st_rdev = 0, st_size = 40, st_blksize = 4096, st_blocks = 0,
st_atim = {tv_sec = 1498523393, tv_nsec = 731915583}, st_mtim = {tv_sec = 1498533865,
tv_nsec = 274210743}, st_ctim = {tv_sec = 1498533865, tv_nsec = 274210743},
__glibc_reserved = {0, 0, 0}}
__func__ = "main"
```
Info locals:
```
[New LWP 12052]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/sbin/kamailio -P /var/run/kamailio/kamailio.pid -f
/etc/kamailio/sbc.cfg -'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007efcf3b5df69 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
No symbol table info available.
```
List:
```
[New LWP 12052]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/sbin/kamailio -P /var/run/kamailio/kamailio.pid -f
/etc/kamailio/sbc.cfg -'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007efcf3b5df69 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
```
#### Log Messages
We have regular logging with no issues, then suddenly we get:
```
Jun 28 01:57:51 kam-1 sbc[12075]: WARNING: <script>: [DISPATCHER] - Destination
down: OPTIONS sip:A.A.A.A:5060 (<null>)
Jun 28 01:57:51 kam-1 sbc[12075]: WARNING: <script>: [DISPATCHER] - Destination
down: OPTIONS sip:B.B.B.B:5060 (<null>)
Jun 28 01:58:40 kam-1 sbc[12076]: NOTICE: <script>: Node unavailable, trying next
sip:A.A.A.A:5060 - M=INVITE R=sip:+12345678900@A.A.A.A:5060 ID=334f3vqDtj
Jun 28 01:58:40 kam-1 sbc[12076]: NOTICE: <script>: Forwarding request - M=INVITE
R=sip:+12345678900@A.A.A.A:5060 ID=334f3vqDtj
Jun 28 01:58:55 kam-1 sbc[12075]: WARNING: dialog [dlg_handlers.c:1574]: dlg_ontimeout():
timeout for dlg with CallID '00g4gNy5KZ' and tags 'FHmrD-CM3'
'SZ3a5Sg58c5pB'
Jun 28 01:58:55 kam-1 sbc[12075]: WARNING: dialog [dlg_handlers.c:1574]: dlg_ontimeout():
timeout for dlg with CallID 'Kj7uLRzJfd' and tags 'wRSVjfGaT'
'yQHvjNaZ5Z3rc'
Jun 28 01:58:55 kam-1 sbc[12075]: WARNING: dialog [dlg_handlers.c:1574]: dlg_ontimeout():
timeout for dlg with CallID 'S5QUIXtS6-' and tags 'FV4ySEouz'
'eS7F910ycNg8H'
Jun 28 01:59:10 kam-1 sbc[12075]: ERROR: <script>: No available gateways - M=INVITE
R=sip:+12345678900@B.B.B.B:5060 ID=334f3vqDtj
Jun 28 02:01:45 kam-1 sbc[12080]: NOTICE: dialog [dlg_hash.c:248]: dlg_clean_run(): dialog
in delete state is too old (0x7efaf3904008 ref 1)
Jun 28 02:03:15 kam-1 sbc[12080]: NOTICE: dialog [dlg_hash.c:248]: dlg_clean_run(): dialog
in delete state is too old (0x7efaf40f0f50 ref 1)
Jun 28 02:04:45 kam-1 sbc[12080]: NOTICE: dialog [dlg_hash.c:248]: dlg_clean_run(): dialog
in delete state is too old (0x7efaf4d92108 ref 1)
Jun 28 02:55:59 kam-1 sbc[12071]: INFO: <core> [main.c:823]: sig_usr(): signal 15
received
Jun 28 02:55:59 kam-1 sbc[12052]: NOTICE: <core> [main.c:696]: handle_sigs(): Thank
you for flying kamailio!!!
```
NOTE: The process stops logging at 02:04:45, then at 02:55:59 we manually restart kamailio
and a core is generated.
Also, in `dmesg` we have:
```
[138953.744199] kamailio[12052]: segfault at 7efaf32f51b8 ip 00007efcf3b5df69 sp
00007ffe325dc0c0 error 4 in libcrypto.so.1.1[7efcf39f6000+265000]
```
#### SIP Traffic
I don't have sip traffic, If required I can start capturing it.
### Additional Information
```
# kamailio -v
version: kamailio 5.0.2 (x86_64/linux)
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: unknown
compiled with gcc 6.3.0
#
```
```
# dpkg -l | grep kamailio
ii kamailio 5.0.2+stretch amd64 very
fast, dynamic and configurable SIP server
ii kamailio-dbg:amd64 5.0.2+stretch amd64 very fast
and configurable SIP server [debug symbols]
ii kamailio-extra-modules:amd64 5.0.2+stretch amd64 Extra
modules for the Kamailio SIP Server
ii kamailio-tls-modules:amd64 5.0.2+stretch amd64 TLS
support for the Kamailio SIP server (authentication, transport)
#
```
```
# dpkg -l |grep libssl
ii libssl1.0.2:amd64 1.0.2l-2 amd64 Secure
Sockets Layer toolkit - shared libraries
ii libssl1.1:amd64 1.1.0f-3 amd64 Secure
Sockets Layer toolkit - shared libraries#
```
* **Operating System**:
```
# uname -a
Linux kam-1 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u1 (2017-06-18) x86_64 GNU/Linux
```
```
# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.0 (stretch)
Release: 9.0
Codename: stretch
#
```
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