HackMD
Ropsten Besu Consensus Fork Investigation
First step was to identify the bad blocks using debug_getBadBlocks.
curl --location --request POST 'http://127.0.0.1:8545' --header 'Content-Type: text/plain' --data-raw '{"jsonrpc":"2.0","method":"debug_getBadBlocks","params":[],"id":1}'
Then we retrieved log files of operations performed on the bad blocks using debug_standardTraceBadBlockToFile RPC API.
curl --location --request POST ‘http://127.0.0.1:8545’ --header ‘Content-Type: application/json’ --data-raw '{"jsonrpc":"2.0","method":"debug_standardTraceBadBlockToFile","params":["0x0d9db1248c91a8a2f9b37442d50e7c38b2344853f35b1862e1cf6275ce792467", {"disableMemory":false}],"id":1}’
We found the splitter transaction.
It is the transaction number 23.
- The image file may be corrupted
- The server hosting the image is unavailable
- The image path is incorrect
- The image format is not supported
The problem is located here: https://github.com/hyperledger/besu/blob/ebefafe09ff408545954305a8de30868a38b2ba9/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/BerlinGasCalculator.java#L195-L209
Besu charges 100 for the SSTORE while other clients charge 2900.
Finally this was not the issue. However it showed a bug in the debug_standardTraceBadBlockToFile API because the gas reported was not the one actually charged.
Resources
Open Ethereum traceReplayTransactions
Canonical block on Ropsten
Monitoring link
Traces
