[OpenSIPS-Users] CPU 100% with TCP
Bogdan-Andrei Iancu
bogdan at opensips.org
Tue Nov 13 11:11:16 EST 2018
Hi Ben,
Sorry for not being able to answer you before sending the new set of
BTs. Indeed, getting the corefile of only one process will do it as the
locks (and debug info) are in the shared memory. So, the deadlock
happens again, do the "opensipsctl trap" and get the corefile of one
process (ideally an UDP worker - get its pid via "opensipsctl fifo ps").
Keep the core as we will have to dig into it together :).
Many thanks,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com
OpenSIPS Bootcamp 2018
http://opensips.org/training/OpenSIPS_Bootcamp_2018/
On 11/06/2018 10:14 PM, Ben Newlin wrote:
>
> Bogdan,
>
> I am trying to obtain this information for you but I am having trouble
> getting the core files. Is it really necessary to kill every opensips
> process? This generates almost 40 core files and each is quite large
> (~1GB). I simply don’t have that disk space currently. I can make a
> change to get more but it is slowing the process. Would it be
> sufficient to get just one core file?
>
> Also, runtime inspection with gdb is possible in this case if you can
> provide me with the commands you would want to see. I would need very
> specific commands as I am not very familiar with gdb.
>
> Ben Newlin
>
> *From: *Bogdan-Andrei Iancu <bogdan at opensips.org>
> *Date: *Thursday, November 1, 2018 at 1:29 PM
> *To: *Ben Newlin <Ben.Newlin at genesys.com>, OpenSIPS users mailling
> list <users at lists.opensips.org>
> *Subject: *Re: [OpenSIPS-Users] CPU 100% with TCP
>
> Hi Ben,
>
> First be sure you have the DBG_LOCK option compiled in. Do the
> "opensips -V" and see the output flags.
>
> Next step will be to force an SIGSEGV to opensips (killall -11
> opensips) when the deadlock occurs - I need a core file to inspect
> (assuming that runtime inspection with gdb is not possible).
>
> Regards,
>
> Bogdan-Andrei Iancu
> OpenSIPS Founder and Developer
> http://www.opensips-solutions.com
> OpenSIPS Bootcamp 2018
> http://opensips.org/training/OpenSIPS_Bootcamp_2018/
>
> On 10/31/2018 09:07 PM, Ben Newlin wrote:
>
> Bogdan,
>
> For the first test I have done as you suggested and disabled only
> async operation for HEP, so it is still using TCP. I will send you
> the trap info directly as it is too large. I also compiled with
> the DBG_LOCK option, but am unsure whether that extra information
> will be available in the trap output or do you need something else?
>
> I am now going to switch HEP to use UDP to mirror our production
> environment and try to reproduce again. Wish me luck! ☺
>
> Ben Newlin
>
> *From: *Bogdan-Andrei Iancu <bogdan at opensips.org>
> <mailto:bogdan at opensips.org>
> *Date: *Monday, October 29, 2018 at 2:19 PM
> *To: *Ben Newlin <Ben.Newlin at genesys.com>
> <mailto:Ben.Newlin at genesys.com>, OpenSIPS users mailling list
> <users at lists.opensips.org> <mailto:users at lists.opensips.org>
> *Subject: *Re: [OpenSIPS-Users] CPU 100% with TCP
>
> Hi Ben,
>
> 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.
>
> 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.
>
> 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?
>
> Regards,
>
>
> Bogdan-Andrei Iancu
>
>
>
> OpenSIPS Founder and Developer
>
> http://www.opensips-solutions.com
>
> OpenSIPS Bootcamp 2018
>
> http://opensips.org/training/OpenSIPS_Bootcamp_2018/
>
> On 10/26/2018 04:14 PM, Ben Newlin wrote:
>
> Bogdan,
>
> Actually, yes we do. Looking back I can see these errors just
> before the issue occurs:
>
> Oct 24 19:00:36 [5700] ERROR:proto_hep:send_hep_message:
> Cannot send hep message!
>
> Oct 24 19:00:36 [5700] ERROR:proto_hep:msg_send: send() to
> 10.32.163.211:9061 for proto hep_tcp/9 failed
>
> Oct 24 19:00:36 [5700] ERROR:proto_hep:hep_tcp_send: failed to
> send
>
> Oct 24 19:00:36 [5700] ERROR:proto_hep:async_tsend_stream:
> Failed first TCP async send : (32) Broken pipe
>
> I will try disabling HEP and see if we can reproduce.
>
> 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.
>
> Ben Newlin
>
> *From: *Bogdan-Andrei Iancu <bogdan at opensips.org>
> <mailto:bogdan at opensips.org>
> *Date: *Friday, October 26, 2018 at 3:06 AM
> *To: *Ben Newlin <Ben.Newlin at genesys.com>
> <mailto:Ben.Newlin at genesys.com>, OpenSIPS users mailling list
> <users at lists.opensips.org> <mailto:users at lists.opensips.org>
> *Subject: *Re: [OpenSIPS-Users] CPU 100% with TCP
>
> Hi Ben,
>
> Thank you for the info.
>
> 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 ?
>
> Also, as PoC, could you disabled HEP tracing to see if the
> problem goes away ?
>
> Thanks,
>
>
>
>
> Bogdan-Andrei Iancu
>
>
>
> OpenSIPS Founder and Developer
>
> http://www.opensips-solutions.com
>
> OpenSIPS Bootcamp 2018
>
> http://opensips.org/training/OpenSIPS_Bootcamp_2018/
>
> On 10/24/2018 10:18 PM, Ben Newlin wrote:
>
> Bogdan,
>
> I have run the command but the output was too large for
> pastebin so I have sent it to you directly.
>
> Ben Newlin
>
> *From: *Bogdan-Andrei Iancu <bogdan at opensips.org>
> <mailto:bogdan at opensips.org>
> *Date: *Wednesday, October 24, 2018 at 5:17 AM
> *To: *OpenSIPS users mailling list
> <users at lists.opensips.org>
> <mailto:users at lists.opensips.org>, Ben Newlin
> <Ben.Newlin at genesys.com> <mailto:Ben.Newlin at genesys.com>
> *Subject: *Re: [OpenSIPS-Users] CPU 100% with TCP
>
> Hi Ben,
>
> Could you run "opensipsctl trap" ?
>
> Regards,
>
>
>
>
> Bogdan-Andrei Iancu
>
>
>
> OpenSIPS Founder and Developer
>
> http://www.opensips-solutions.com
>
> OpenSIPS Bootcamp 2018
>
> http://opensips.org/training/OpenSIPS_Bootcamp_2018/
>
> On 10/24/2018 12:56 AM, Ben Newlin wrote:
>
> Hi,
>
> 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.
>
> 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.
>
> I obtained as much information as I could using ps,
> strace, and gdb here: https://pastebin.com/JP3DnCqs
> <https://pastebin.com/JP3DnCqs>. We can reproduce the
> failure consistently by removing a server during call
> traffic.
>
> A few things I noticed:
>
> * The number of running threads reported by OpenSIPS
> doesn’t align with our configuration, copied here:
>
> ####### Global Parameters #########
>
> children=32
>
> #// Allow 503 to pass back to Control
>
> disable_503_translation=yes
>
> #// Even though we are not receiving HEP,
>
> #// this listener is required by OpenSIPS
>
> #// in order to use the proto_hep module. :/
>
> listen=hep_tcp:10.32.40.245:9061 use_children 1
>
> #// Configure the listeners
>
> listen=udp:10.32.40.245:5060 as XXX.XXX.XXX.XXX
>
> listen=tcp:10.32.40.245:5060 as XXX.XXX.XXX.XXX
>
> #// Transaction Module
>
> loadmodule "tm.so"
>
> modparam("tm", "restart_fr_on_each_reply", 0)
>
> modparam("tm", "timer_partitions", 8)
>
> modparam("tm", "onreply_avp_mode", 1)
>
> modparam("tm", "wt_timer", 10)
>
> 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.
>
> * 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.
>
> Any assistance with this would be appreciated.
>
> [1] -
> http://www.opensips.org/Documentation/Script-CoreParameters-2-4#toc66
>
> Ben Newlin
>
>
>
>
>
>
>
> _______________________________________________
>
> Users mailing list
>
> Users at lists.opensips.org <mailto:Users at lists.opensips.org>
>
> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opensips.org/pipermail/users/attachments/20181113/91ee8849/attachment-0001.html>
More information about the Users
mailing list