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laforge gerrit-no-reply at lists.osmocom.orglaforge has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-sgsn/+/19027 ) Change subject: Send a BVC-RESET to all persistent Gb interfaces at start-up ...................................................................... Patch Set 4: Code-Review+2 (1 comment) > Patch Set 4: > > The SGSN could react on S_NS_UNBLOCK signal and check if the NSVC is persistant. We should ensure we don't reset a running BSVC. The S_NS_UNBLOCK is only used on Frame Relay or on non-spec-compliant "IPA style" Gb/IP. Spec-compliant Gb/IP doesn't use the NS-RESET/BLOCK/UNBLOCK procedures, so this event is never received. I am very much inclined to merge this patch as it fixes an annoying deadlock occurring in the real world at a customer installation. https://gerrit.osmocom.org/c/osmo-sgsn/+/19027/4/src/sgsn/sgsn_main.c File src/sgsn/sgsn_main.c: https://gerrit.osmocom.org/c/osmo-sgsn/+/19027/4/src/sgsn/sgsn_main.c@215 PS4, Line 215: nsvc->state |= NSE_S_ALIVE; > we shouldn't sent messages over dead nsvc's The problem is that with the specific BSS I'm talking to, the only way to make the link active again is to send a BVC-RESET. Basically it's stuck in an indefinite loop of: Jul 29 11:00:08 osmo-cn osmo-sgsn[1409]: <0010> gprs_bssgp.c:1099 NSEI=1000/BVCI=100 Rejecting PDU type BVC-UNBLOCK for unknown BVCI Jul 29 11:00:08 osmo-cn osmo-sgsn[1409]: <0010> gprs_bssgp_util.c:237 BSSGP BVCI=100 Tx STATUS, cause=Unknown BVCI The BSS is ignoring that STATUS and the only way to recover after a SGSN restart is to send the BVC-RESET. -- To view, visit https://gerrit.osmocom.org/c/osmo-sgsn/+/19027 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-sgsn Gerrit-Branch: master Gerrit-Change-Id: I0b46035b40709c38bb9ab9493c11031a577e3ee0 Gerrit-Change-Number: 19027 Gerrit-PatchSet: 4 Gerrit-Owner: laforge <laforge at osmocom.org> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: laforge <laforge at osmocom.org> Gerrit-Reviewer: lynxis lazus <lynxis at fe80.eu> Gerrit-Reviewer: pespin <pespin at sysmocom.de> Gerrit-Comment-Date: Wed, 29 Jul 2020 09:12:30 +0000 Gerrit-HasComments: Yes Gerrit-Has-Labels: Yes Comment-In-Reply-To: lynxis lazus <lynxis at fe80.eu> Gerrit-MessageType: comment -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20200729/d4ed02f9/attachment.htm>