cmd, params: implement Gray Glacier hard-fork (EIP-5133) (#25088)

* cmd/geth, params: implement Gray Glacier (EIP-5133)

* cmd/evm: add gray glacier tests

* params: nitpicks

* params: fixes

cmd/evm/internal/t8ntool/flags.go

@@ -152,7 +152,7 @@ var (
 			"\n\tSyntax <forkname>(+ExtraEip)",
 			strings.Join(tests.AvailableForks(), "\n\t    "),
 			strings.Join(vm.ActivateableEips(), ", ")),
-		Value: "ArrowGlacier",
+		Value: "GrayGlacier",
 	}
 	VerbosityFlag = cli.IntFlag{
 		Name:  "verbosity",

cmd/evm/t8n_test.go

@@ -211,6 +211,14 @@ func TestT8n(t *testing.T) {
 			output: t8nOutput{result: true},
 			expOut: "exp_arrowglacier.json",
 		},
+		{ // Difficulty calculation on gray glacier
+			base: "./testdata/19",
+			input: t8nInput{
+				"alloc.json", "txs.json", "env.json", "GrayGlacier", "",
+			},
+			output: t8nOutput{result: true},
+			expOut: "exp_grayglacier.json",
+		},
 		{ // Sign unprotected (pre-EIP155) transaction
 			base: "./testdata/23",
 			input: t8nInput{

cmd/evm/testdata/19/exp_grayglacier.json

+{
+    "result": {
+      "stateRoot": "0x6f058887ca01549716789c380ede95aecc510e6d1fdc4dbf67d053c7c07f4bdc",
+      "txRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+      "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+      "logsHash": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+      "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+      "receipts": [],
+      "currentDifficulty": "0x2000000004000",
+      "gasUsed": "0x0"
+    }
+}
\ No newline at end of file

cmd/evm/testdata/19/readme.md

 ## Difficulty calculation
 
 This test shows how the `evm t8n` can be used to calculate the (ethash) difficulty, if none is provided by the caller, 
-this time on `ArrowGlacier` (Eip 4345).
+this time on `GrayGlacier` (Eip 5133).
 
-Calculating it (with an empty set of txs) using `ArrowGlacier` rules (and no provided unclehash for the parent block):
+Calculating it (with an empty set of txs) using `GrayGlacier` rules (and no provided unclehash for the parent block):
 ```
-[user@work evm]$ ./evm t8n --input.alloc=./testdata/14/alloc.json --input.txs=./testdata/14/txs.json --input.env=./testdata/14/env.json --output.result=stdout --state.fork=ArrowGlacier
+[user@work evm]$ ./evm t8n --input.alloc=./testdata/19/alloc.json --input.txs=./testdata/19/txs.json --input.env=./testdata/19/env.json --output.result=stdout --state.fork=GrayGlacier
 ```
\ No newline at end of file

cmd/geth/config.go

@@ -156,8 +156,8 @@ func makeConfigNode(ctx *cli.Context) (*node.Node, gethConfig) {
 // makeFullNode loads geth configuration and creates the Ethereum backend.
 func makeFullNode(ctx *cli.Context) (*node.Node, ethapi.Backend) {
 	stack, cfg := makeConfigNode(ctx)
-	if ctx.GlobalIsSet(utils.OverrideArrowGlacierFlag.Name) {
-		cfg.Eth.OverrideArrowGlacier = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideArrowGlacierFlag.Name))
+	if ctx.GlobalIsSet(utils.OverrideGrayGlacierFlag.Name) {
+		cfg.Eth.OverrideGrayGlacier = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideGrayGlacierFlag.Name))
 	}
 	if ctx.GlobalIsSet(utils.OverrideTerminalTotalDifficulty.Name) {
 		cfg.Eth.OverrideTerminalTotalDifficulty = utils.GlobalBig(ctx, utils.OverrideTerminalTotalDifficulty.Name)

cmd/geth/main.go

@@ -69,7 +69,7 @@ var (
 		utils.NoUSBFlag,
 		utils.USBFlag,
 		utils.SmartCardDaemonPathFlag,
-		utils.OverrideArrowGlacierFlag,
+		utils.OverrideGrayGlacierFlag,
 		utils.OverrideTerminalTotalDifficulty,
 		utils.EthashCacheDirFlag,
 		utils.EthashCachesInMemoryFlag,

cmd/utils/flags.go

@@ -257,9 +257,9 @@ var (
 		Usage: "Megabytes of memory allocated to bloom-filter for pruning",
 		Value: 2048,
 	}
-	OverrideArrowGlacierFlag = cli.Uint64Flag{
-		Name:  "override.arrowglacier",
-		Usage: "Manually specify Arrow Glacier fork-block, overriding the bundled setting",
+	OverrideGrayGlacierFlag = cli.Uint64Flag{
+		Name:  "override.grayglacier",
+		Usage: "Manually specify Gray Glacier fork-block, overriding the bundled setting",
 	}
 	OverrideTerminalTotalDifficulty = BigFlag{
 		Name:  "override.terminaltotaldifficulty",

consensus/ethash/consensus.go

@@ -45,6 +45,11 @@ var (
 	maxUncles                     = 2                 // Maximum number of uncles allowed in a single block
 	allowedFutureBlockTimeSeconds = int64(15)         // Max seconds from current time allowed for blocks, before they're considered future blocks
 
+	// calcDifficultyEip5133 is the difficulty adjustment algorithm as specified by EIP 5133.
+	// It offsets the bomb a total of 11.4M blocks.
+	// Specification EIP-5133: https://eips.ethereum.org/EIPS/eip-5133
+	calcDifficultyEip5133 = makeDifficultyCalculator(big.NewInt(11_400_000))
+
 	// calcDifficultyEip4345 is the difficulty adjustment algorithm as specified by EIP 4345.
 	// It offsets the bomb a total of 10.7M blocks.
 	// Specification EIP-4345: https://eips.ethereum.org/EIPS/eip-4345
@@ -334,6 +339,8 @@ func (ethash *Ethash) CalcDifficulty(chain consensus.ChainHeaderReader, time uin
 func CalcDifficulty(config *params.ChainConfig, time uint64, parent *types.Header) *big.Int {
 	next := new(big.Int).Add(parent.Number, big1)
 	switch {
+	case config.IsGrayGlacier(next):
+		return calcDifficultyEip5133(time, parent)
 	case config.IsArrowGlacier(next):
 		return calcDifficultyEip4345(time, parent)
 	case config.IsLondon(next):

core/forkid/forkid_test.go

@@ -31,7 +31,7 @@ import (
 // the correct fork ID.
 func TestCreation(t *testing.T) {
 	mergeConfig := *params.MainnetChainConfig
-	mergeConfig.MergeNetsplitBlock = big.NewInt(15000000)
+	mergeConfig.MergeNetsplitBlock = big.NewInt(18000000)
 	type testcase struct {
 		head uint64
 		want ID
@@ -68,8 +68,10 @@ func TestCreation(t *testing.T) {
 				{12964999, ID{Hash: checksumToBytes(0x0eb440f6), Next: 12965000}}, // Last Berlin block
 				{12965000, ID{Hash: checksumToBytes(0xb715077d), Next: 13773000}}, // First London block
 				{13772999, ID{Hash: checksumToBytes(0xb715077d), Next: 13773000}}, // Last London block
-				{13773000, ID{Hash: checksumToBytes(0x20c327fc), Next: 0}},        // First Arrow Glacier block
-				{20000000, ID{Hash: checksumToBytes(0x20c327fc), Next: 0}},        // Future Arrow Glacier block
+				{13773000, ID{Hash: checksumToBytes(0x20c327fc), Next: 15050000}}, // First Arrow Glacier block
+				{15049999, ID{Hash: checksumToBytes(0x20c327fc), Next: 15050000}}, // Last Arrow Glacier block
+				{15050000, ID{Hash: checksumToBytes(0xf0afd0e3), Next: 0}},        // First Gray Glacier block
+				{20000000, ID{Hash: checksumToBytes(0xf0afd0e3), Next: 0}},        // Future Gray Glacier block
 			},
 		},
 		// Ropsten test cases
@@ -163,9 +165,11 @@ func TestCreation(t *testing.T) {
 				{12964999, ID{Hash: checksumToBytes(0x0eb440f6), Next: 12965000}}, // Last Berlin block
 				{12965000, ID{Hash: checksumToBytes(0xb715077d), Next: 13773000}}, // First London block
 				{13772999, ID{Hash: checksumToBytes(0xb715077d), Next: 13773000}}, // Last London block
-				{13773000, ID{Hash: checksumToBytes(0x20c327fc), Next: 15000000}}, // First Arrow Glacier block
-				{15000000, ID{Hash: checksumToBytes(0xe3abe201), Next: 0}},        // First Merge Start block
-				{20000000, ID{Hash: checksumToBytes(0xe3abe201), Next: 0}},        // Future Merge Start block
+				{13773000, ID{Hash: checksumToBytes(0x20c327fc), Next: 15050000}}, // First Arrow Glacier block
+				{15049999, ID{Hash: checksumToBytes(0x20c327fc), Next: 15050000}}, // Last Arrow Glacier block
+				{15050000, ID{Hash: checksumToBytes(0xf0afd0e3), Next: 18000000}}, // First Gray Glacier block
+				{18000000, ID{Hash: checksumToBytes(0x4fb8a872), Next: 0}},        // First Merge Start block
+				{20000000, ID{Hash: checksumToBytes(0x4fb8a872), Next: 0}},        // Future Merge Start block
 			},
 		},
 	}
@@ -242,11 +246,11 @@ func TestValidation(t *testing.T) {
 		// Local is mainnet Petersburg, remote is Rinkeby Petersburg.
 		{7987396, ID{Hash: checksumToBytes(0xafec6b27), Next: 0}, ErrLocalIncompatibleOrStale},
 
-		// Local is mainnet Arrow Glacier, far in the future. Remote announces Gopherium (non existing fork)
+		// Local is mainnet Gray Glacier, far in the future. Remote announces Gopherium (non existing fork)
 		// at some future block 88888888, for itself, but past block for local. Local is incompatible.
 		//
 		// This case detects non-upgraded nodes with majority hash power (typical Ropsten mess).
-		{88888888, ID{Hash: checksumToBytes(0x20c327fc), Next: 88888888}, ErrLocalIncompatibleOrStale},
+		{88888888, ID{Hash: checksumToBytes(0xf0afd0e3), Next: 88888888}, ErrLocalIncompatibleOrStale},
 
 		// Local is mainnet Byzantium. Remote is also in Byzantium, but announces Gopherium (non existing
 		// fork) at block 7279999, before Petersburg. Local is incompatible.

core/genesis.go

@@ -233,7 +233,7 @@ func SetupGenesisBlock(db ethdb.Database, genesis *Genesis) (*params.ChainConfig
 	return SetupGenesisBlockWithOverride(db, genesis, nil, nil)
 }
 
-func SetupGenesisBlockWithOverride(db ethdb.Database, genesis *Genesis, overrideArrowGlacier, overrideTerminalTotalDifficulty *big.Int) (*params.ChainConfig, common.Hash, error) {
+func SetupGenesisBlockWithOverride(db ethdb.Database, genesis *Genesis, overrideGrayGlacier, overrideTerminalTotalDifficulty *big.Int) (*params.ChainConfig, common.Hash, error) {
 	if genesis != nil && genesis.Config == nil {
 		return params.AllEthashProtocolChanges, common.Hash{}, errGenesisNoConfig
 	}
@@ -279,8 +279,8 @@ func SetupGenesisBlockWithOverride(db ethdb.Database, genesis *Genesis, override
 	}
 	// Get the existing chain configuration.
 	newcfg := genesis.configOrDefault(stored)
-	if overrideArrowGlacier != nil {
-		newcfg.ArrowGlacierBlock = overrideArrowGlacier
+	if overrideGrayGlacier != nil {
+		newcfg.GrayGlacierBlock = overrideGrayGlacier
 	}
 	if overrideTerminalTotalDifficulty != nil {
 		newcfg.TerminalTotalDifficulty = overrideTerminalTotalDifficulty
@@ -301,8 +301,8 @@ func SetupGenesisBlockWithOverride(db ethdb.Database, genesis *Genesis, override
 	// apply the overrides.
 	if genesis == nil && stored != params.MainnetGenesisHash {
 		newcfg = storedcfg
-		if overrideArrowGlacier != nil {
-			newcfg.ArrowGlacierBlock = overrideArrowGlacier
+		if overrideGrayGlacier != nil {
+			newcfg.GrayGlacierBlock = overrideGrayGlacier
 		}
 		if overrideTerminalTotalDifficulty != nil {
 			newcfg.TerminalTotalDifficulty = overrideTerminalTotalDifficulty

eth/backend.go

@@ -137,7 +137,7 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 	if err != nil {
 		return nil, err
 	}
-	chainConfig, genesisHash, genesisErr := core.SetupGenesisBlockWithOverride(chainDb, config.Genesis, config.OverrideArrowGlacier, config.OverrideTerminalTotalDifficulty)
+	chainConfig, genesisHash, genesisErr := core.SetupGenesisBlockWithOverride(chainDb, config.Genesis, config.OverrideGrayGlacier, config.OverrideTerminalTotalDifficulty)
 	if _, ok := genesisErr.(*params.ConfigCompatError); genesisErr != nil && !ok {
 		return nil, genesisErr
 	}

eth/ethconfig/config.go

@@ -205,8 +205,8 @@ type Config struct {
 	// CheckpointOracle is the configuration for checkpoint oracle.
 	CheckpointOracle *params.CheckpointOracleConfig `toml:",omitempty"`
 
-	// Arrow Glacier block override (TODO: remove after the fork)
-	OverrideArrowGlacier *big.Int `toml:",omitempty"`
+	// Gray Glacier block override (TODO: remove after the fork)
+	OverrideGrayGlacier *big.Int `toml:",omitempty"`
 
 	// OverrideTerminalTotalDifficulty (TODO: remove after the fork)
 	OverrideTerminalTotalDifficulty *big.Int `toml:",omitempty"`

eth/ethconfig/gen_config.go

@@ -59,7 +59,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 		RPCTxFeeCap                     float64
 		Checkpoint                      *params.TrustedCheckpoint      `toml:",omitempty"`
 		CheckpointOracle                *params.CheckpointOracleConfig `toml:",omitempty"`
-		OverrideArrowGlacier            *big.Int                       `toml:",omitempty"`
+		OverrideGrayGlacier             *big.Int                       `toml:",omitempty"`
 		OverrideTerminalTotalDifficulty *big.Int                       `toml:",omitempty"`
 	}
 	var enc Config
@@ -104,7 +104,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 	enc.RPCTxFeeCap = c.RPCTxFeeCap
 	enc.Checkpoint = c.Checkpoint
 	enc.CheckpointOracle = c.CheckpointOracle
-	enc.OverrideArrowGlacier = c.OverrideArrowGlacier
+	enc.OverrideGrayGlacier = c.OverrideGrayGlacier
 	enc.OverrideTerminalTotalDifficulty = c.OverrideTerminalTotalDifficulty
 	return &enc, nil
 }
@@ -153,7 +153,7 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 		RPCTxFeeCap                     *float64
 		Checkpoint                      *params.TrustedCheckpoint      `toml:",omitempty"`
 		CheckpointOracle                *params.CheckpointOracleConfig `toml:",omitempty"`
-		OverrideArrowGlacier            *big.Int                       `toml:",omitempty"`
+		OverrideGrayGlacier             *big.Int                       `toml:",omitempty"`
 		OverrideTerminalTotalDifficulty *big.Int                       `toml:",omitempty"`
 	}
 	var dec Config
@@ -283,8 +283,8 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 	if dec.CheckpointOracle != nil {
 		c.CheckpointOracle = dec.CheckpointOracle
 	}
-	if dec.OverrideArrowGlacier != nil {
-		c.OverrideArrowGlacier = dec.OverrideArrowGlacier
+	if dec.OverrideGrayGlacier != nil {
+		c.OverrideGrayGlacier = dec.OverrideGrayGlacier
 	}
 	if dec.OverrideTerminalTotalDifficulty != nil {
 		c.OverrideTerminalTotalDifficulty = dec.OverrideTerminalTotalDifficulty

eth/gasprice/gasprice_test.go

@@ -108,6 +108,7 @@ func newTestBackend(t *testing.T, londonBlock *big.Int, pending bool) *testBacke
 	)
 	config.LondonBlock = londonBlock
 	config.ArrowGlacierBlock = londonBlock
+	config.GrayGlacierBlock = londonBlock
 	engine := ethash.NewFaker()
 	db := rawdb.NewMemoryDatabase()
 	genesis, err := gspec.Commit(db)

les/client.go

@@ -93,7 +93,7 @@ func New(stack *node.Node, config *ethconfig.Config) (*LightEthereum, error) {
 	if err != nil {
 		return nil, err
 	}
-	chainConfig, genesisHash, genesisErr := core.SetupGenesisBlockWithOverride(chainDb, config.Genesis, config.OverrideArrowGlacier, config.OverrideTerminalTotalDifficulty)
+	chainConfig, genesisHash, genesisErr := core.SetupGenesisBlockWithOverride(chainDb, config.Genesis, config.OverrideGrayGlacier, config.OverrideTerminalTotalDifficulty)
 	if _, isCompat := genesisErr.(*params.ConfigCompatError); genesisErr != nil && !isCompat {
 		return nil, genesisErr
 	}

params/config.go

@@ -73,6 +73,7 @@ var (
 		BerlinBlock:         big.NewInt(12_244_000),
 		LondonBlock:         big.NewInt(12_965_000),
 		ArrowGlacierBlock:   big.NewInt(13_773_000),
+		GrayGlacierBlock:    big.NewInt(15_050_000),
 		Ethash:              new(EthashConfig),
 	}
 
@@ -259,16 +260,16 @@ var (
 	//
 	// This configuration is intentionally not using keyed fields to force anyone
 	// adding flags to the config to also have to set these fields.
-	AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
+	AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
 
 	// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
 	// and accepted by the Ethereum core developers into the Clique consensus.
 	//
 	// This configuration is intentionally not using keyed fields to force anyone
 	// adding flags to the config to also have to set these fields.
-	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
+	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
 
-	TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
+	TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
 	TestRules       = TestChainConfig.Rules(new(big.Int), false)
 )
 
@@ -357,6 +358,7 @@ type ChainConfig struct {
 	BerlinBlock         *big.Int `json:"berlinBlock,omitempty"`         // Berlin switch block (nil = no fork, 0 = already on berlin)
 	LondonBlock         *big.Int `json:"londonBlock,omitempty"`         // London switch block (nil = no fork, 0 = already on london)
 	ArrowGlacierBlock   *big.Int `json:"arrowGlacierBlock,omitempty"`   // Eip-4345 (bomb delay) switch block (nil = no fork, 0 = already activated)
+	GrayGlacierBlock    *big.Int `json:"grayGlacierBlock,omitempty"`    // Eip-5133 (bomb delay) switch block (nil = no fork, 0 = already activated)
 	MergeNetsplitBlock  *big.Int `json:"mergeNetsplitBlock,omitempty"`  // Virtual fork after The Merge to use as a network splitter
 
 	// TerminalTotalDifficulty is the amount of total difficulty reached by
@@ -438,6 +440,9 @@ func (c *ChainConfig) String() string {
 	if c.ArrowGlacierBlock != nil {
 		banner += fmt.Sprintf(" - Arrow Glacier:               %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/arrow-glacier.md)\n", c.ArrowGlacierBlock)
 	}
+	if c.GrayGlacierBlock != nil {
+		banner += fmt.Sprintf(" - Gray Glacier:                %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/gray-glacier.md)\n", c.GrayGlacierBlock)
+	}
 	banner += "\n"
 
 	// Add a special section for the merge as it's non-obvious
@@ -520,6 +525,11 @@ func (c *ChainConfig) IsArrowGlacier(num *big.Int) bool {
 	return isForked(c.ArrowGlacierBlock, num)
 }
 
+// IsGrayGlacier returns whether num is either equal to the Gray Glacier (EIP-5133) fork block or greater.
+func (c *ChainConfig) IsGrayGlacier(num *big.Int) bool {
+	return isForked(c.GrayGlacierBlock, num)
+}
+
 // IsTerminalPoWBlock returns whether the given block is the last block of PoW stage.
 func (c *ChainConfig) IsTerminalPoWBlock(parentTotalDiff *big.Int, totalDiff *big.Int) bool {
 	if c.TerminalTotalDifficulty == nil {
@@ -569,6 +579,7 @@ func (c *ChainConfig) CheckConfigForkOrder() error {
 		{name: "berlinBlock", block: c.BerlinBlock},
 		{name: "londonBlock", block: c.LondonBlock},
 		{name: "arrowGlacierBlock", block: c.ArrowGlacierBlock, optional: true},
+		{name: "grayGlacierBlock", block: c.GrayGlacierBlock, optional: true},
 		{name: "mergeNetsplitBlock", block: c.MergeNetsplitBlock, optional: true},
 	} {
 		if lastFork.name != "" {
@@ -642,6 +653,9 @@ func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, head *big.Int) *Confi
 	if isForkIncompatible(c.ArrowGlacierBlock, newcfg.ArrowGlacierBlock, head) {
 		return newCompatError("Arrow Glacier fork block", c.ArrowGlacierBlock, newcfg.ArrowGlacierBlock)
 	}
+	if isForkIncompatible(c.GrayGlacierBlock, newcfg.GrayGlacierBlock, head) {
+		return newCompatError("Gray Glacier fork block", c.GrayGlacierBlock, newcfg.GrayGlacierBlock)
+	}
 	if isForkIncompatible(c.MergeNetsplitBlock, newcfg.MergeNetsplitBlock, head) {
 		return newCompatError("Merge netsplit fork block", c.MergeNetsplitBlock, newcfg.MergeNetsplitBlock)
 	}

tests/difficulty_test.go

@@ -79,6 +79,9 @@ func TestDifficulty(t *testing.T) {
 	dt.config("EIP4345", params.ChainConfig{
 		ArrowGlacierBlock: big.NewInt(0),
 	})
+	dt.config("EIP5133", params.ChainConfig{
+		GrayGlacierBlock: big.NewInt(0),
+	})
 	dt.config("difficulty.json", mainnetChainConfig)
 
 	dt.walk(t, difficultyTestDir, func(t *testing.T, name string, test *DifficultyTest) {

tests/init.go

@@ -197,6 +197,22 @@ var Forks = map[string]*params.ChainConfig{
 		LondonBlock:         big.NewInt(0),
 		ArrowGlacierBlock:   big.NewInt(0),
 	},
+	"GrayGlacier": {
+		ChainID:             big.NewInt(1),
+		HomesteadBlock:      big.NewInt(0),
+		EIP150Block:         big.NewInt(0),
+		EIP155Block:         big.NewInt(0),
+		EIP158Block:         big.NewInt(0),
+		ByzantiumBlock:      big.NewInt(0),
+		ConstantinopleBlock: big.NewInt(0),
+		PetersburgBlock:     big.NewInt(0),
+		IstanbulBlock:       big.NewInt(0),
+		MuirGlacierBlock:    big.NewInt(0),
+		BerlinBlock:         big.NewInt(0),
+		LondonBlock:         big.NewInt(0),
+		ArrowGlacierBlock:   big.NewInt(0),
+		GrayGlacierBlock:    big.NewInt(0),
+	},
 	"Merged": {
 		ChainID:                 big.NewInt(1),
 		HomesteadBlock:          big.NewInt(0),