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Summary

Some nodes debug.log show (multiple) ERROR: ContextualCheckBlockHeader: forked chain older than max reorganization depth

Steps to reproduce

Can't repro at will

Expected behaviour

Log doesn't contain forked chain messages

Problematic behavior

Some nodes appear to have detected forked chains, often multiple times

Crown-core environment info

Ubuntu 16.04.05 LTS

Crown-core application info

Crown version v0.12.7.1-2029222a

Relevant logs, dumps and/or screenshots

2019-01-17 20:06:23 receive version message: /Crown Core:0.12.7.1/: version 71054, blocks=15827, us=164.132.151.93:19340, peer=150
2019-01-17 20:06:23 Added time data, samples 16, offset +0 (+0 minutes)
2019-01-17 20:06:24 ERROR: ContextualCheckBlockHeader: forked chain older than max reorganization depth (height 15000)
2019-01-17 20:06:24 ERROR: ProcessNewBlock : AcceptBlock FAILED
2019-01-17 20:06:24 Misbehaving: 81.92.203.109:58388 (0 -> 1)
2019-01-17 20:06:24 ERROR: ContextualCheckBlockHeader: forked chain older than max reorganization depth (height 15000)
2019-01-17 20:06:24 ERROR: ProcessNewBlock : AcceptBlock FAILED
2019-01-17 20:06:24 Misbehaving: 81.92.203.109:58388 (1 -> 2)

Drop full logs & dumps here: https://nextcloud.crown.tech/nextcloud/s/znd8HiiAsRX3C6B

Possible fixes

(Any comments on what you think might be responsible for the problem, if you have particular insight.)

/cc @artem