### Description

I'm using a few serial http_async_client functions in my config, I found one 
setup in which kamailio stops with a segmentation fault just doing one call. I 
can reproduce it in my concrete config, but can't put my finger on the 
bleeding. I do have a core file. 

### Troubleshooting

#### Reproduction

gdb kamailio core
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
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Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from kamailio...done.
[New LWP 8187]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `kamailio -f /etc/kamailio/kamailio.cfg'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f85580c360a in t_continue () from 
/usr/lib/x86_64-linux-gnu/kamailio/modules/tm.so
(gdb) bt full
#0  0x00007f85580c360a in t_continue () from 
/usr/lib/x86_64-linux-gnu/kamailio/modules/tm.so
No symbol table info available.
#1  0x00007f8555ed3848 in async_http_cb () from 
/usr/lib/x86_64-linux-gnu/kamailio/modules/http_async_client.so
No symbol table info available.
#2  0x00007f8555ecda72 in check_multi_info () from 
/usr/lib/x86_64-linux-gnu/kamailio/modules/http_async_client.so
No symbol table info available.
#3  0x00007f8555ec56a4 in event_cb () from 
/usr/lib/x86_64-linux-gnu/kamailio/modules/http_async_client.so
No symbol table info available.
#4  0x00007f8555a043dc in event_base_loop () from 
/usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
No symbol table info available.
#5  0x00007f8555ed0c3d in async_http_run_worker () from 
/usr/lib/x86_64-linux-gnu/kamailio/modules/http_async_client.so
No symbol table info available.
#6  0x00007f8555eba86e in ?? () from 
/usr/lib/x86_64-linux-gnu/kamailio/modules/http_async_client.so
No symbol table info available.
#7  0x00000000004f204c in init_mod_child (m=0x7f855a6195c8, rank=0) at 
core/sr_module.c:921
        __FUNCTION__ = "init_mod_child"
#8  0x00000000004f1d6a in init_mod_child (m=0x7f855a61a1e0, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#9  0x00000000004f1d6a in init_mod_child (m=0x7f855a61a850, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#10 0x00000000004f1d6a in init_mod_child (m=0x7f855a61adb0, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#11 0x00000000004f1d6a in init_mod_child (m=0x7f855a61b420, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#12 0x00000000004f1d6a in init_mod_child (m=0x7f855a61b8d0, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#13 0x00000000004f1d6a in init_mod_child (m=0x7f855a61bfe8, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#14 0x00000000004f1d6a in init_mod_child (m=0x7f855a61c440, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#15 0x00000000004f1d6a in init_mod_child (m=0x7f855a61c7e8, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#16 0x00000000004f1d6a in init_mod_child (m=0x7f855a61cb88, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#17 0x00000000004f1d6a in init_mod_child (m=0x7f855a61cfc8, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#18 0x00000000004f1d6a in init_mod_child (m=0x7f855a61d370, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#19 0x00000000004f1d6a in init_mod_child (m=0x7f855a61d780, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#20 0x00000000004f1d6a in init_mod_child (m=0x7f855a61dbc8, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#21 0x00000000004f1d6a in init_mod_child (m=0x7f855a61e380, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
---Type <return> to continue, or q <return> to quit--- 
#22 0x00000000004f1d6a in init_mod_child (m=0x7f855a61ec00, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#23 0x00000000004f1d6a in init_mod_child (m=0x7f855a621608, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#24 0x00000000004f1d6a in init_mod_child (m=0x7f855a622290, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#25 0x00000000004f1d6a in init_mod_child (m=0x7f855a622660, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#26 0x00000000004f1d6a in init_mod_child (m=0x7f855a62c5d0, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#27 0x00000000004f1d6a in init_mod_child (m=0x7f855a62dae0, rank=0) at 
core/sr_module.c:918
        __FUNCTION__ = "init_mod_child"
#28 0x00000000004f237a in init_child (rank=0) at core/sr_module.c:947
No locals.
#29 0x00000000004231bb in main_loop () at main.c:1700
        i = 4
        pid = 8165
        si = 0x0
        si_desc = "udp receiver child=3 
sock=185.165.211.54:5063\000\000\000OX\350T\205\177\000\000\000Y\350T\205\177\000\000\260\031B\201\000\000\000\000\000\000\000\000\000\000\350\000\000\000t\000\000\000\000\000\030\"}Z\205\177\000\000\000\000\000\000\000\000\000\000\001\000\000\000\002\000\000\000\002\000\000\000\374\177\000\000\277\201e\000\000\000\000"
        nrprocs = 4
        woneinit = 1
        __FUNCTION__ = "main_loop"
#30 0x0000000000429a61 in main (argc=3, argv=0x7ffc81421d18) at main.c:2639
        cfg_stream = 0xf55010
        c = -1
        r = 0
        tmp = 0x7f855b58173d <_dl_lookup_symbol_x+349> "\203\370"
        tmp_len = 0
        port = 1
        proto = 32645
        options = 0x72b1b0 
":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 = 1992621074
        rfd = 4
        debug_save = 0
        debug_flag = 0
        dont_fork_cnt = 0
        n_lst = 0x7ffc81421bd0
        p = 0x7ffc81421d38 "0>B\201\374\177"
        st = {st_dev = 47, st_ino = 29, st_nlink = 2, st_mode = 16877, st_uid = 
104, st_gid = 110, __pad0 = 0, st_rdev = 0, st_size = 60, st_blksize = 4096, 
st_blocks = 0, st_atim = {tv_sec = 1488206724, 
            tv_nsec = 372702711}, st_mtim = {tv_sec = 1491326162, tv_nsec = 
837249928}, st_ctim = {tv_sec = 1491326162, tv_nsec = 837249928}, 
__glibc_reserved = {0, 0, 0}}
        __FUNCTION__ = "main"
(gdb) info locals
No symbol table info available.
(gdb) list
1838            int proto;
1839            char *options;
1840            int ret;
1841            unsigned int seed;
1842            int rfd;
1843            int debug_save, debug_flag;
1844            int dont_fork_cnt;
1845            struct name_lst* n_lst;
1846            char *p;
1847            struct stat st = {0};

```
(paste your debugging data here)
```

#### Log Messages

<!--
Check the syslog file and if there are relevant log messages printed by 
Kamailio, add them next, or attach to issue, or provide a link to download them 
(e.g., to a pastebin site).
-->

```
(paste your log messages here)
```

#### SIP Traffic



```
(paste your sip traffic here)
```

### Possible Solutions


### Additional Information

kamailio 5.0.0 (x86_64/linux)



* **Operating System**:
debian on proxmox  4.4.35-1-pve




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