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<p>Hello,<br>
</p>
<div class="moz-cite-prefix">On 02.06.21 19:00, Trevor Hemsley
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:eda8d604-1d66-66a8-379d-8aa19888e448@voiceflex.com">
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<style type="text/css">.style1 {font-family: "Times New Roman";}</style>
<div class="moz-text-html" lang="x-western"> Hi<br>
<br>
We've seen a few occurrences of this crash since we implemented
kamailio 5.4.5 for our inbound call traffic.</div>
</blockquote>
<p>to clarify: have you made an update to kamailio 5.4.5 from an
older version and since then you started to have such crashes? If
yes, what was the previous version? I quickly checked and there
were no major changes to dialog module in 5.4 branch.<br>
</p>
<p>If you started with this version, is it under heavy load? Have
you captured the SIP traffic? It would be useful to see the sip
messages for such call. <br>
</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:eda8d604-1d66-66a8-379d-8aa19888e448@voiceflex.com">
<div class="moz-text-html" lang="x-western"> Preceding the crash
we always get a message in the logs about "dialog
[dlg_hash.c:1182]: next_state_dlg(): bogus event 2 in state 5
for dlg" and whenever we see that message, we get the crash.<br>
<br>
Jun 1 10:12:14 thissystem /usr/sbin/kamailio[20001]: CRITICAL:
{2 1 INVITE <a class="moz-txt-link-abbreviated"
href="mailto:6787142-3831531134-1330894187@some.telco.domain"
moz-do-not-send="true">
6787142-3831531134-1330894187@some.telco.domain</a>} dialog
[dlg_hash.c:1182]: next_state_dlg(): bogus event 2 in state 5
for dlg 0x7fae153d3cf0 [3973:6059] with clid '<a
class="moz-txt-link-abbreviated"
href="mailto:82608924-3831089984-1833452161@some.telco.domain"
moz-do-not-send="true">82608924-3831089984-1833452161@some.telco.domain</a>'
and tags '3831089984-684203260' ''<br>
<br>
The crash happens on line 879 of <a
class="moz-txt-link-freetext"
href="https://github.com/kamailio/kamailio/blob/master/src/modules/dialog/dlg_db_handler.c"
target="_BLANK" moz-do-not-send="true">
https://github.com/kamailio/kamailio/blob/master/src/modules/dialog/dlg_db_handler.c</a></div>
</blockquote>
<p>You reference to code in master branch, not in 5.4 branch, so
unless you did the remapping, the lines might not be the same. <br>
</p>
<p>If you have the core dump files, the best is to get the output of
the next gdb commands:</p>
<p>"""<br>
bt full</p>
<p>list</p>
<p>info locals<br>
""<br>
</p>
<p>You can eventually open an issue in the bug tracker to collect
the details there and assist with troubleshooting.</p>
<p>Cheers,<br>
Daniel<br>
</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:eda8d604-1d66-66a8-379d-8aa19888e448@voiceflex.com">
<div class="moz-text-html" lang="x-western"> <br>
<br>
<pre><span class="pl-c1">SET_STR_VALUE</span>(values+<span class="pl-c1">7</span>, cell-><span class="pl-smi">bind_addr</span>[DLG_CALLER_LEG]-><span class="pl-smi">sock_str</span>);</pre>
<br>
Looking at gdb, I see that cell-><span class="pl-smi">bind_addr</span>[DLG_CALLER_LEG]
== 0 so trying to use it results in the segfault. I have thought
about patching that to check for bind_addr being set and
bypassing that line if not but I do not think it's the right fix
though it probably would avoid the current crash (and do odd
things later instead!). I did check that everything else in that
function that uses DLG_CALLER_LEG is set correctly and it
appears that it is - or at least if not correctly then they are
at least set!<br>
<br>
The "bogus event 2 in state 5" message is coming out from line
1143 in src/modules/ims_dialog/dlg_hash.c<br>
<br>
<pre> case DLG_EVENT_RPL1xx:
switch (dlg->state) {
case DLG_STATE_UNCONFIRMED:
case DLG_STATE_EARLY:
dlg->state = DLG_STATE_EARLY;
break;
default:
log_next_state_dlg(event, dlg);
}
break;
</pre>
(I didn't really understand why it would set dlg->state =
DLG_STATE_EARLY if it's already DLG_STATE_EARLY but...)<br>
<br>
I have a couple of core dumps of this from the last day or two -
usually seems to crash at least once a week on our pair of
kamailio inbound servers. If there's any more info I can provide
to help fix this properly rather than my proposed bodge then
feel free to ask.<br>
<br>
Trevor Hemsley<br>
</div>
<br>
<br>
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</blockquote>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
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