<p><strong>Description</strong></p>
<p>Recently we have upgraded to <strong>kamailio 5.3</strong> version and we are  performing load tests on it for scalability but Unfortunately it is <strong>crashed</strong> while performing in <strong>ims_dialog</strong> module.<br>
we are using <strong>ims_dialog</strong> module instead of <strong>dialog</strong> module for <strong>diameter</strong> protocol purpose.</p>
<p><strong>Troubleshooting</strong></p>
<p>We found out that <strong>dlg_out</strong> is <strong>NULL</strong> but we are accessing the <strong>dlg_out->to_tag.len</strong> this leads to the crash..But unfortunately we don't know how this gets <strong>NULL</strong>  as <strong>dlg_out</strong> is assigned to <strong>d_entry_out->first</strong> which is <strong>NOT NULL</strong></p>
<p><strong>GDB messages:</strong></p>
<p>(gdb)<br>
#0  0x00007fbe5a646ea6 in next_state_dlg (dlg=0x7fbe57dcf268, event=3, old_state=0x7ffc8b03f0a0, new_state=0x7ffc8b03f0a4,<br>
unref=0x7ffc8b03f09c, to_tag=0x7ffc8b03f080) at dlg_hash.c:1180<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="31891578" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/1" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/1/hovercard" href="https://github.com/kamailio/kamailio/issues/1">#1</a>  0x00007fbe5a622170 in dlg_onreply (t=0x7fbe57f7a3f0, type=1048576, param=0x7ffc8b03f2f0) at dlg_handlers.c:1276<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="41491271" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/2" data-hovercard-type="pull_request" data-hovercard-url="/kamailio/kamailio/pull/2/hovercard" href="https://github.com/kamailio/kamailio/pull/2">#2</a>  0x00007fbe5e2b5517 in run_trans_callbacks_internal (cb_lst=0x7fbe57f7a468, type=1048576, trans=0x7fbe57f7a3f0,<br>
params=0x7ffc8b03f2f0) at t_hooks.c:254<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="48744343" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/3" data-hovercard-type="pull_request" data-hovercard-url="/kamailio/kamailio/pull/3/hovercard" href="https://github.com/kamailio/kamailio/pull/3">#3</a>  0x00007fbe5e2b5733 in run_trans_callbacks_with_buf (type=1048576, rbuf=0x7fbe57f7a4c0, req=0x7fbe57f7bab0,<br>
repl=0x7fbe5fa1d218, flags=0) at t_hooks.c:297<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="49856885" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/4" data-hovercard-type="pull_request" data-hovercard-url="/kamailio/kamailio/pull/4/hovercard" href="https://github.com/kamailio/kamailio/pull/4">#4</a>  0x00007fbe5e2fc05f in relay_reply (t=0x7fbe57f7a3f0, p_msg=0x7fbe5fa1d218, branch=1, msg_status=183,<br>
cancel_data=0x7ffc8b03f760, do_put_on_wait=1) at t_reply.c:1986<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="51480460" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/5" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/5/hovercard" href="https://github.com/kamailio/kamailio/issues/5">#5</a>  0x00007fbe5e300ec3 in reply_received (p_msg=0x7fbe5fa1d218) at t_reply.c:2540<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="51489870" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/6" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/6/hovercard" href="https://github.com/kamailio/kamailio/issues/6">#6</a>  0x00000000004b6f43 in do_forward_reply (msg=0x7fbe5fa1d218, mode=0) at core/forward.c:745<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="51492477" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/7" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/7/hovercard" href="https://github.com/kamailio/kamailio/issues/7">#7</a>  0x00000000004b8a8f in forward_reply (msg=0x7fbe5fa1d218) at core/forward.c:846<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="51499233" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/8" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/8/hovercard" href="https://github.com/kamailio/kamailio/issues/8">#8</a>  0x00000000005527c7 in receive_msg (<br>
buf=0xb3b740 "SIP/2.0 183 Session Progress\r\nVia: SIP/2.0/UDP 182.72.244.91:5060;branch=z9hG4bK7fea.85af5c92096548bdd857481789b3e50f.1, SIP/2.0/UDP 182.72.244.91:5080;received=182.72.244.91;rport=5080;branch=z9hG4bK"..., len=613, rcv_info=0x7ffc8b040000)<br>
at core/receive.c:510<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="51703057" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/9" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/9/hovercard" href="https://github.com/kamailio/kamailio/issues/9">#9</a>  0x0000000000675077 in udp_rcv_loop () at core/udp_server.c:548<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="52436308" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/10" data-hovercard-type="pull_request" data-hovercard-url="/kamailio/kamailio/pull/10/hovercard" href="https://github.com/kamailio/kamailio/pull/10">#10</a> 0x0000000000425f4b in main_loop () at main.c:1673<br>
<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="52569646" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/11" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/11/hovercard" href="https://github.com/kamailio/kamailio/issues/11">#11</a> 0x000000000042e52a in main (argc=13, argv=0x7ffc8b040808) at main.c:2802</p>
<hr>
<p>(gdb) f 0<br>
#0  0x00007fbe5a646ea6 in next_state_dlg (dlg=0x7fbe57dcf268, event=3, old_state=0x7ffc8b03f0a0, new_state=0x7ffc8b03f0a4,<br>
unref=0x7ffc8b03f09c, to_tag=0x7ffc8b03f080) at dlg_hash.c:1180<br>
1180                            if (dlg_out->to_tag.len == to_tag->len && memcmp(dlg_out->to_tag.s, to_tag->s, dlg_out->to_tag.len) == 0) {<br>
(gdb) info locals<br>
d_entry = 0x7fbe57d5ab70<br>
d_entry_out = 0x7fbe57dcf378<br>
dlg_out = 0x0<br>
found = -1<br>
delete = 1<br>
<strong>FUNCTION</strong> = "next_state_dlg"<br>
(gdb) p d_entry_out->first<br>
$10 = (struct dlg_cell_out *) 0x7fbe57fcf6b8</p>
<p><strong>Additional Information</strong></p>
<p><strong>version</strong>: kamailio 5.3.2 (x86_64/linux)</p>
<p>Thanks in Advance...I am beginning to work with kamailio ....can you guys please give me some hints how to move forward with this..</p>

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