Hi all & hi Daniel ,

We had a crash with version 4.0.5 today .

I looks like it happens due to a race condition between a provisional response (183) and the generation of a 408 .

We send the INVITE, get a `100 Trying` from upstream , then we get a `183 Session Progress` from upstream , then after exactly 1 minute , we get another `183 Session Progress` from upstream. At this moment kamailio crashed.

Some tm params we have :

modparam("tm", "fr_timer", 5000)

modparam("tm", "fr_inv_timer", 60000) <- our final reply timer is 1 minute .

modparam("tm", "restart_fr_on_each_reply", 1)

GDB output and logs here:

kamailio 4.0.5 crash - in fake_req() - race cond - Pastebin.com



				kamailio 4.0.5 crash - in fake_req() - race cond - Paste... (gdb) bt #0 0x00007f4d93129a32 in memcpy () from /lib64/libc.so.6

				View on pastebin.com	Preview by Yahoo

In fake_req() from t_reply.c , the pointer shmem_msg->new_uri.s which is passed to memcpy becomes invalid.

memcpy( faked_req->new_uri.s, shmem_msg->new_uri.s,faked_req->new_uri.len);

(gdb) p shmem_msg->new_uri

$3 = {s = 0x0, len = 0}

If this bug is not supposed to be fixed in 4.2.0 , we can help with debugging .

Regards,

Dragos