forkchoiceUpdatedV3 must only be called for cancun payloads

启动eth2.0 一段时间后，报如下错误

WARN [05-24|11:39:02.090] Served engine_forkchoiceUpdatedV3        conn=127.0.0.1:53124 reqid=355251 duration="74.273µs" err="Unsupported fork" errdata="{Error:forkchoiceUpdatedV3 must only be called for cancun payloads}"

查看代码
https://github.com/ethereum/go-ethereum/blob/b6474e9f90c88003de7d7eb993ddb5f60133172e/eth/catalyst/api.go#L213-L224

// ForkchoiceUpdatedV3 is equivalent to V2 with the addition of parent beacon block root
// in the payload attributes. It supports only PayloadAttributesV3.
func (api *ConsensusAPI) ForkchoiceUpdatedV3(update engine.ForkchoiceStateV1, params *engine.PayloadAttributes) (engine.ForkChoiceResponse, error) {
	if params != nil {
		if params.Withdrawals == nil {
			return engine.STATUS_INVALID, engine.InvalidPayloadAttributes.With(errors.New("missing withdrawals"))
		}
		if params.BeaconRoot == nil {
			return engine.STATUS_INVALID, engine.InvalidPayloadAttributes.With(errors.New("missing beacon root"))
		}
		if api.eth.BlockChain().Config().LatestFork(params.Timestamp) != forks.Cancun { // 关键代码
			return engine.STATUS_INVALID, engine.UnsupportedFork.With(errors.New("forkchoiceUpdatedV3 must only be called for cancun payloads"))
		}
	}

跟踪下代码，
https://github.com/ethereum/go-ethereum/blob/b6474e9f90c88003de7d7eb993ddb5f60133172e/params/config.go#L763-L778

// LatestFork returns the latest time-based fork that would be active for the given time.
func (c *ChainConfig) LatestFork(time uint64) forks.Fork {
	// Assume last non-time-based fork has passed.
	london := c.LondonBlock

	switch {
	case c.IsPrague(london, time):
		return forks.Prague
	case c.IsCancun(london, time):
		return forks.Cancun
	case c.IsShanghai(london, time):
		return forks.Shanghai
	default:
		return forks.Paris
	}
}

当前genesis配置如下

{
  "config": {
    "chainId": ....,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "berlinBlock": 0,
    "londonBlock": 0,
    "mergeNetsplitBlock": 0,
    "terminalTotalDifficulty": 0,
    "terminalTotalDifficultyPassed": true,
    "shanghaiTime": 0,
    "cancunTime": 0,
    "pragueTime": 1716532255
  },
  ....
  "coinbase": "0x0000000000000000000000000000000000000000",
  "difficulty": "0x01",
  "extraData": "",
  "gasLimit": "0x17d7840",
  "nonce": "0x1234",
  "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "timestamp": "1715760655"

由于设置了pragueTime，所以LatestFork会返回Prague fork,不会是Cancun，所以ForkchoiceUpdatedV3会报错，至于Prague为什么不支持ForkchoiceUpdatedV3，留个TODO

目前要做的是把最新的fork改为Cancun

1. 将genesis.json中的pragueTime删掉
2. 停止geth服务
3. 重新初始化

./geth --config ./config/config.toml init ./config/genesis.json

4. 重启geth服务