### Description
I just update kamailio 5.2.1 to 5.4.1. then there are some crashs from
keepalive module.
### Troubleshooting
![image](https://user-images.githubusercontent.com/16113837/93066033-08c29880-f6ac-11ea-8660-12348f8881ab.png)
#### Reproduction
#### Debugging Data
```
Thread 1 (Thread 0x2b4d0df90d00 (LWP 30239)):
#0 0x00000000004ef1a7 in atomic_cmpxchg_int (var=0x0, old=0, new_v=1) at
core/mem/../atomic/atomic_x86.h:224
#1 0x00000000004ef21a in futex_get (lock=0x0) at core/mem/../futexlock.h:99
#2 0x00000000004f339a in timer_add_safe (tl=0x2b4d13af7928, delta=8) at
core/timer.c:543
#3 0x00002b4d133b32c3 in ka_add_dest (uri=0x7ffe571d1440,
owner=0x7ffe571d1430, flags=0, ping_interval=3, statechanged_clb=0x0,
response_clb=0x0, user_attr=0x0) at keepalive_api.c:120
#4 0x00002b4d133b95ff in ka_mod_add_destination (type=2147483649,
val=0x2b4d0ed29300) at keepalive_mod.c:244
#5 0x00000000006615b8 in set_mod_param_regex (regex=0x2b4d0ed29130
"keepalive", name=0x2b4d0ed29218 "destination", type=1, val=0x2b4d0ed29300) at
core/modparam.c:125
#6 0x00000000007becec in yyparse () at core/cfg.y:1842
#7 0x000000000042f216 in main (argc=5, argv=0x7ffe571d2578) at main.c:2320
#3 0x00002b4d133b32c3 in ka_add_dest (uri=0x7ffe571d1440,
owner=0x7ffe571d1430, flags=0, ping_interval=3, statechanged_clb=0x0,
response_clb=0x0, user_attr=0x0) at keepalive_api.c:120
120 if(timer_add(dest->timer, MS_TO_TICKS(KA_FIRST_TRY_DELAY)) < 0){
$2 = {next = 0x0, prev = 0x0, expire = 0, initial_timeout = 0, data =
0x2b4d13af7738, f = 0x2b4d133b4fbf <ka_check_timer>, flags = 0, slow_idx = 0}
_uri = {user = {s = 0x0, len = 0}, passwd = {s = 0x0, len = 0}, host = {s =
0x2b4d13af783c "172.18.67.47", len = 12}, port = {s = 0x0, len = 0}, params =
{s = 0x0, len = 0}, sip_params = {s = 0x0, len = 0},
headers = {s = 0x0, len = 0}, port_no = 0, proto = 0, type = SIP_URI_T, flags
= (unknown: 0), transport = {s = 0x0, len = 0}, ttl = {s = 0x0, len = 0},
user_param = {s = 0x0, len = 0}, maddr = {s = 0x0,
len = 0}, method = {s = 0x0, len = 0}, lr = {s = 0x0, len = 0}, r2 = {s =
0x0, len = 0}, gr = {s = 0x0, len = 0}, transport_val = {s = 0x0, len = 0},
ttl_val = {s = 0x0, len = 0}, user_param_val = {
s = 0x0, len = 0}, maddr_val = {s = 0x0, len = 0}, method_val = {s = 0x0,
len = 0}, lr_val = {s = 0x0, len = 0}, r2_val = {s = 0x0, len = 0}, gr_val = {s
= 0x0, len = 0}}
dest = 0x2b4d13af7738
hollow = 0x0
__FUNCTION__ = "ka_add_dest"
#2 0x00000000004f339a in timer_add_safe (tl=0x2b4d13af7928, delta=8) at
core/timer.c:543
543 LOCK_TIMER_LIST();
ret = 0
__FUNCTION__ = "timer_add_safe"
```
#### Log Messages
```
Sep 14 15:49:34 localhost kamailio: INFO: pv [pv_shv.c:60]: shvar_init_locks():
locks array size 16
Sep 14 15:49:34 localhost kernel: kamailio[30186]: segfault at 0 ip
00000000004ef1a7 sp 00007ffdd2db9170 error 6 in kamailio[400000+4ae000]
```
#### SIP Traffic
```
(paste your sip traffic here)
```
### Possible Solutions
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
(paste your output here)
```
* **Operating System**:
```
Linux version 3.10.0-327.el7.x86_64 (buil...@kbuilder.dev.centos.org) (gcc
version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu Nov 19 22:10:57 UTC
2015
```
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https://github.com/kamailio/kamailio/issues/2476
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