I have found that this issue seems to only occur when the responses are received immediately after the request has been sent; within a few milliseconds. Inserting a delay in the response seems to have made the erroneous retransmissions stop. This does not make it any less of a bug, but does seem to be a workaround.
Ben Newlin From: Devel <devel-boun...@lists.opensips.org> on behalf of Ben Newlin <ben.new...@genesys.com> Reply-To: OpenSIPS devel mailling list <devel@lists.opensips.org> Date: Friday, April 19, 2019 at 8:47 AM To: OpenSIPS devel mailling list <devel@lists.opensips.org> Subject: [OpenSIPS-Devel] Erroneous Retransmissions Resending the issue described below to the devel mailing list as I believe this is a bug, not a configuration issue. Ben Newlin From: Users <users-boun...@lists.opensips.org> on behalf of Ben Newlin <ben.new...@genesys.com> Reply-To: OpenSIPS users mailling list <us...@lists.opensips.org> Date: Monday, April 15, 2019 at 7:20 PM To: OpenSIPS users mailling list <us...@lists.opensips.org> Subject: Re: [OpenSIPS-Users] Erroneous Retransmissions Just wanted to bump this to see if anyone has had a chance to take a look. We are continuing to see this failing our tests intermittently. I have a new example here: https://pastebin.com/kQJSGE56. In this example you can see that the retransmission of the INVITE is occurring not just after the 100 Trying has been received, but also after a 500 final response has already been received and is being processed, but the INVITE is still retransmitted! Any help on this would be greatly appreciated. # opensips -V version: opensips 2.4.5 (x86_64/linux) flags: STATS: On, DISABLE_NAGLE, USE_MCAST, SHM_MMAP, PKG_MALLOC, F_MALLOC, FAST_LOCK-ADAPTIVE_WAIT ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535 poll method support: poll, epoll, sigio_rt, select. git revision: d025b4f61 main.c compiled on 21:18:18 Apr 12 2019 with gcc 7 Ben Newlin From: Users <users-boun...@lists.opensips.org> on behalf of Ben Newlin <ben.new...@genesys.com> Reply-To: OpenSIPS users mailling list <us...@lists.opensips.org> Date: Thursday, April 4, 2019 at 3:10 PM To: OpenSIPS users mailling list <us...@lists.opensips.org> Subject: [OpenSIPS-Users] Erroneous Retransmissions Hello, We are seeing an issue which is causing our tests to fail intermittently. It appears that sometimes OpenSIPS will retransmit a relayed INVITE request, even though a 100 Trying response has already been received and processed. This only happens intermittently. I have captured debug logs for the scenario: https://pastebin.com/bHcBJmtv. In the log, you can see the 100 Trying response is received on line 707 and it appears to be matched to the correct transaction on line 729. However then on line 774 you can see the retransmission of the INVITE anyway. I have verified using tcpdump that the INVITE is being retransmitted; it is not just a log error. And our tests are failing due to the unexpected extra 100 Trying response to the retransmission. Can anyone explain why this would occur? Ben Newlin
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