Disorderly Constantinople fork on Ropsten testnet

[jpitts]

Linking here to a related discussion, this is retrospectives / post-mortems:

Issues we discovered in the Ropsten Constantinople hard fork

Here’s my initial post-mortem and concern/task list following the Constantinople Ropsten hard fork, in no particular order. A consensus bug in Parity was discovered (https://github.com/paritytech/parity-ethereum/pull/9746). We need to understand why this consensus bug occurred in the first place, and particularly why it wasn’t caught by the tests. @ethchris suggests that we may need clearer EIP specs including pseudo code (https://twitter.com/ethchris/status/1052503731072315392). Apparently i…