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** [tickets:#3095] mds: Message loss after splitbrain with enabled
MDS_TIPC_FCTRL_ENABLED**
**Status:** assigned
**Milestone:** 5.19.10
**Created:** Sat Sep 28, 2019 10:22 PM UTC by Minh Hon Chau
**Last Updated:** Sat Sep 28, 2019 10:22 PM UTC
**Owner:** Minh Hon Chau
After both SCs see each other after split brain, message loss occurs since some
sequences are missing
2019-09-27T07:13:08.906+02:00 SC-2-1 tipclog[3762]: Lost link
<1.1.1:eth0-1.1.2:eth0> on network plane A
2019-09-27T07:13:25.369+02:00 SC-2-1 tipclog[3762]: Established link
<1.1.1:eth0-1.1.2:eth0> on network plane A
2019-09-27T07:13:25.369+02:00 SC-2-1 tipclog[3762]: Established contact with
node <1.1.2>
mds.log:<139>1 2019-09-27T07:13:25.368051+02:00 SC-2-1 osafamfd 8822 mds.log
[meta sequenceId="418"] FCTRL: [me] <-- [node:1001002, ref:1599079723],
RcvData[mseq:8066, mfrag:0, fseq:**539**], rcvwnd[acked:535, rcv:**535**,
nacked:0], Error[msg loss]
mds.log:<139>1 2019-09-27T07:13:25.378774+02:00 SC-2-1 osafimmd 8684 mds.log
[meta sequenceId="337"] FCTRL: [me] <-- [node:1001002, ref:2606175488],
RcvData[mseq:28901, mfrag:0, fseq:**773**], rcvwnd[acked:771, rcv:**771**,
nacked:0], Error[msg loss]
At this moment, the message loss will be restransmitted in scenario of tipc
buffer overflow (TIPC_RETDATA), the message loss in this scenario (splitbrain)
is not retransmitted.
Prior that MDS_TIPC_FCTRL_ENABLED, in this scenario, amfd will forward msg with
seq=539 to upper layer, and accept to miss the seq=536, 537, 538.
With the fix of this ticket, mds will start the restransmission of 536, 537,
538.
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