[kamailio/kamailio] Kamailio crashes when it receives a 404 reply to an INVITE originated after a 302. (#875) - sr-dev

1 Dec 2016

Hi, 

Kamailio crashes when we handle a 302 redirect and the reply is a 404.

...
  # kamailio -v
 version: kamailio 4.4.4 (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 4.9.2 
root@14cn5:/home/joel/files#

This works:

...
  softphone1 > kamailio1 > server1 > 302 >
kamailio1 > server2 > 200 OK 

This crashes:

...
  softphone1 > kamailio1 > server1 > 302 >
kamailio1 > server2 > 404 Not Found 

I'm attaching debug logs, sip traces and the bt full from backtrace.

IPs:

...
  A.B.C.D = Kamailio IP
 E.F.G.H = Softphone IP
 I.J.K.L1 = dispatcher node1
 I.J.K.L2 = dispatcher node2 
In the config we send INVITE requests to a dispatcher group (very simple config).

Then, in failure_route we have:

```
    if (t_check_status("302")) {
        xlog("L_NOTICE", "Redirecting to TestName: $T_rpl($ct) - M=$rm
R=$ru ID=$ci\n");
        get_redirects("*");
        route(RELAY);
    }
```

And call get redirected to the address of the contact in the 302.

If the new INVITE to that address gets a 200, all works, if that request gets a 404,
Kamailio crashes.

Please let me know if you need more info, this is 100% reproducible on our platform.

Thank you!
Joel.

[backtrace.txt](https://github.com/kamailio/kamailio/files/623307/backtrace.…
[debug.txt](https://github.com/kamailio/kamailio/files/623308/debug.txt)
[sip.txt](https://github.com/kamailio/kamailio/files/623309/sip.txt)

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