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Hi Ben,<br>
<br>
I checked the error trace and it should not leave any dangling lock
(due mishandled error). Before disabling HEP, try to disable the
async support for HEP.<br>
<br>
If you claim that the same 100% CPU happens with HEP + UDP, send me
a trap for that too, as in the previous case, the deadlock was
exclusively HEP + TCP related. <br>
<br>
Anyhow, as the original trap showed a deadlock, next step will be to
recompile with the DBG_LOCK option - this enables extra code to
debug/troubleshoot locking related issues - are you able to do it?<br>
<br>
Regards,<br>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a>
OpenSIPS Bootcamp 2018
<a class="moz-txt-link-freetext" href="http://opensips.org/training/OpenSIPS_Bootcamp_2018/">http://opensips.org/training/OpenSIPS_Bootcamp_2018/</a>
</pre>
<div class="moz-cite-prefix">On 10/26/2018 04:14 PM, Ben Newlin
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:97134D2E-9BFE-4CDF-AC24-B4A211EA9BE7@genesys.com">
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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">Bogdan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Actually,
yes we do. Looking back I can see these errors just before
the issue occurs:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New",serif">Oct 24 19:00:36 [5700]
ERROR:proto_hep:send_hep_message: Cannot send hep message!<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New",serif">Oct 24 19:00:36 [5700]
ERROR:proto_hep:msg_send: send() to 10.32.163.211:9061 for
proto hep_tcp/9 failed<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New",serif">Oct 24 19:00:36 [5700]
ERROR:proto_hep:hep_tcp_send: failed to send<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New",serif">Oct 24 19:00:36 [5700]
ERROR:proto_hep:async_tsend_stream: Failed first TCP async
send : (32) Broken pipe<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I will try
disabling HEP and see if we can reproduce.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Just for
information, I have been reproducing the issue in our
testing environment which uses TCP for HEP, however the
issue is occurring in our production environment as well
which is still using UDP for HEP.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Ben
Newlin </span>
<span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:black">From: </span></b><span
style="color:black">Bogdan-Andrei Iancu
<a class="moz-txt-link-rfc2396E" href="mailto:bogdan@opensips.org"><bogdan@opensips.org></a><br>
<b>Date: </b>Friday, October 26, 2018 at 3:06 AM<br>
<b>To: </b>Ben Newlin <a class="moz-txt-link-rfc2396E" href="mailto:Ben.Newlin@genesys.com"><Ben.Newlin@genesys.com></a>,
OpenSIPS users mailling list
<a class="moz-txt-link-rfc2396E" href="mailto:users@lists.opensips.org"><users@lists.opensips.org></a><br>
<b>Subject: </b>Re: [OpenSIPS-Users] CPU 100% with TCP<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><tt><span style="font-size:10.0pt">Hi Ben,</span></tt><span
style="font-size:10.0pt;font-family:"Courier
New",serif"><br>
<br>
<tt>Thank you for the info.</tt><br>
<br>
<tt>It looks like the processes get stuck into a HEP related
internal lock - do you see any HEP related errors in your
logs, prior to the dead-lock ?</tt><br>
<br>
<tt>Also, as PoC, could you disabled HEP tracing to see if
the problem goes away ?</tt><br>
<br>
<tt>Thanks,</tt><br>
<br>
<br>
</span><o:p></o:p></p>
<pre>Bogdan-Andrei Iancu<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>OpenSIPS Founder and Developer<o:p></o:p></pre>
<pre> <a href="http://www.opensips-solutions.com" moz-do-not-send="true">http://www.opensips-solutions.com</a><o:p></o:p></pre>
<pre>OpenSIPS Bootcamp 2018<o:p></o:p></pre>
<pre> <a href="http://opensips.org/training/OpenSIPS_Bootcamp_2018/" moz-do-not-send="true">http://opensips.org/training/OpenSIPS_Bootcamp_2018/</a><o:p></o:p></pre>
<div>
<p class="MsoNormal">On 10/24/2018 10:18 PM, Ben Newlin wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="font-size:11.0pt">Bogdan,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I have run
the command but the output was too large for pastebin so I
have sent it to you directly.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:black">Ben Newlin </span>
<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:black">From: </span></b><span
style="color:black">Bogdan-Andrei Iancu
<a href="mailto:bogdan@opensips.org"
moz-do-not-send="true"><bogdan@opensips.org></a><br>
<b>Date: </b>Wednesday, October 24, 2018 at 5:17 AM<br>
<b>To: </b>OpenSIPS users mailling list <a
href="mailto:users@lists.opensips.org"
moz-do-not-send="true">
<users@lists.opensips.org></a>, Ben Newlin <a
href="mailto:Ben.Newlin@genesys.com"
moz-do-not-send="true">
<Ben.Newlin@genesys.com></a><br>
<b>Subject: </b>Re: [OpenSIPS-Users] CPU 100% with TCP</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
</div>
<p class="MsoNormal"><tt><span style="font-size:10.0pt">Hi
Ben,</span></tt><span
style="font-size:10.0pt;font-family:"Courier
New",serif"><br>
<br>
<tt>Could you run "opensipsctl trap" ?</tt><br>
<br>
<tt>Regards,</tt><br>
<br>
<br>
</span><o:p></o:p></p>
<pre>Bogdan-Andrei Iancu<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre>OpenSIPS Founder and Developer<o:p></o:p></pre>
<pre> <a href="http://www.opensips-solutions.com" moz-do-not-send="true">http://www.opensips-solutions.com</a><o:p></o:p></pre>
<pre>OpenSIPS Bootcamp 2018<o:p></o:p></pre>
<pre> <a href="http://opensips.org/training/OpenSIPS_Bootcamp_2018/" moz-do-not-send="true">http://opensips.org/training/OpenSIPS_Bootcamp_2018/</a><o:p></o:p></pre>
<div>
<p class="MsoNormal">On 10/24/2018 12:56 AM, Ben Newlin
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="font-size:11.0pt">Hi,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">We have
implemented TCP recently and are performing
TCP<->UDP translation on one of our proxy types.
This proxy only exists for that purpose; there are no DB
queries, REST calls, or anything like that. It is
designed to be very fast and high throughput.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Recently
we have found that when the remote endpoint of a TCP
connection is lost, i.e. the server goes down, while
under moderate load OpenSIPS quickly reaches 100% CPU
and becomes unresponsive. When this occurs, the “top”
command shows that between 30-90% CPU is in System
(kernel) space, and each OpenSIPS TCP process shows many
times the normal CPU. We are running OpenSIPS 2.4.2 on
Amazon Linux.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I
obtained as much information as I could using ps,
strace, and gdb here:
<a href="https://pastebin.com/JP3DnCqs"
moz-do-not-send="true">
https://pastebin.com/JP3DnCqs</a>. We can reproduce
the failure consistently by removing a server during
call traffic.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">A few
things I noticed:</span><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l2 level1 lfo3"><span
style="font-size:11.0pt">The number of running threads
reported by OpenSIPS doesn’t align with our
configuration, copied here:</span>
<o:p></o:p></li>
</ul>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">####### Global Parameters #########</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">children=32</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">#// Allow 503 to pass back to Control</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">disable_503_translation=yes</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">#// Even though we are not receiving
HEP,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">#// this listener is required by
OpenSIPS</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">#// in order to use the proto_hep
module. :/</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">listen=hep_tcp:10.32.40.245:9061
use_children 1</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">#// Configure the listeners</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">listen=udp:10.32.40.245:5060 as
XXX.XXX.XXX.XXX</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">listen=tcp:10.32.40.245:5060 as
XXX.XXX.XXX.XXX</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">#// Transaction Module</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">loadmodule "tm.so"</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">modparam("tm",
"restart_fr_on_each_reply", 0)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">modparam("tm", "timer_partitions", 8)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">modparam("tm", "onreply_avp_mode", 1)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Courier
New",serif">modparam("tm", "wt_timer", 10)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoListParagraph"><span style="font-size:11.0pt">According
to the documentation if “tcp_children” is not set then
the value of “children” will be used [1], but we have
set “children” to 32 and only have the default 8 TCP
processes. Also we appear to only have 1 timer process,
although we have set the number of timer partitions to
8.</span><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l2 level1 lfo3"><span
style="font-size:11.0pt">The server that is terminated
was using TCP connections exclusively, but all of the
CPU seems to be in the UDP threads. The one I looked
at appeared to be handling a CANCEL to one of the
calls that was active and was attempting to send it
out via TCP. I’m not sure why it would be trying to
relay the CANCEL as no 100 Trying had been received
from the server. I have noticed that in 2.x OpenSIPS
will now send CANCELs for transactions even when 100
Trying was not received. Is that intentional? RFC 3261
states that no CANCEL should be sent unless a
provisional response has been received.</span>
<o:p></o:p></li>
</ul>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Any
assistance with this would be appreciated.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">[1] - <a
href="http://www.opensips.org/Documentation/Script-CoreParameters-2-4#toc66"
moz-do-not-send="true">
http://www.opensips.org/Documentation/Script-CoreParameters-2-4#toc66</a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:black">Ben Newlin </span>
<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><br>
<br>
<br>
<br>
</span><o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Users mailing list<o:p></o:p></pre>
<pre><a href="mailto:Users@lists.opensips.org" moz-do-not-send="true">Users@lists.opensips.org</a><o:p></o:p></pre>
<pre><a href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users" moz-do-not-send="true">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a><o:p></o:p></pre>
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