Run Geth with an integrated blsync doesn't work. "invalid attested header: unsupported fork: fulu" is reported #33165
Description
System information
Geth version: https://github.com/ethereum/go-ethereum@master
CL client & version: e.g. Integrated blsync
OS & Version: OSX: MacOS Sequoia, Version 15.7.2
Commit hash : master: 15ff378
Expected behaviour
Should successfully download the checkpoint header and sync the block
Actual behaviour
Failed to request beacon block. "error decoding optimistic update event: invalid attested header: unsupported fork: fulu" was reported
Steps to reproduce the behaviour
- Download go-ethereum source code from master branch
- make all
- Follow the instruction at https://geth.ethereum.org/docs/fundamentals/blsync to run Geth with blsync integrated
- Launch Clef with cli command: ./build/bin/clef --keystore geth-tutorial/keystore --configdir geth-tutorial/clef --chainid 11155111
- Launch Geth with cli command:
./build/bin/geth --sepolia --datadir geth-tutorial --authrpc.addr localhost --authrpc.port 8551 --authrpc.vhosts localhost --authrpc.jwtsecret geth-tutorial/jwtsecret --http --http.api eth,net --signer=geth-tutorial/clef/clef.ipc --beacon.api https://lodestar-sepolia.chainsafe.io --beacon.checkpoint 0x71cff47c7fde33703c7aa4c6ff4aeca6ccf929e0eb5ee8c12350e44230d9efba --http
Backtrace
[backtrace]
go-ethereum ricky$ ./build/bin/geth --sepolia --datadir geth-tutorial --authrpc.addr localhost --authrpc.port 8551 --authrpc.vhosts localhost --authrpc.jwtsecret geth-tutorial/jwtsecret --http --http.api eth,net --signer=geth-tutorial/clef/clef.ipc --beacon.api https://lodestar-sepolia.chainsafe.io --beacon.checkpoint 0x71cff47c7fde33703c7aa4c6ff4aeca6ccf929e0eb5ee8c12350e44230d9efba --http
INFO [11-12|16:47:11.520] Starting Geth on Sepolia testnet...
INFO [11-12|16:47:11.522] Maximum peer count ETH=50 total=50
INFO [11-12|16:47:11.523] Using external signer url=geth-tutorial/clef/clef.ipc
INFO [11-12|16:47:11.525] Set global gas cap cap=50,000,000
INFO [11-12|16:47:11.525] Initializing the KZG library backend=gokzg
INFO [11-12|16:47:11.527] Allocated trie memory caches clean=154.00MiB dirty=256.00MiB
INFO [11-12|16:47:11.527] Using pebble as the backing database
INFO [11-12|16:47:11.527] Allocated cache and file handles database=/Users/ricky/ethereum/go-ethereum/geth-tutorial/geth/chaindata cache=512.00MiB handles=5120
INFO [11-12|16:47:11.577] Opened ancient database database=/Users/ricky/ethereum/go-ethereum/geth-tutorial/geth/chaindata/ancient/chain readonly=false
INFO [11-12|16:47:11.577] Opened Era store datadir=/Users/ricky/ethereum/go-ethereum/geth-tutorial/geth/chaindata/ancient/chain/era
INFO [11-12|16:47:11.578] State scheme set to already existing scheme=path
INFO [11-12|16:47:11.578] Initialising Ethereum protocol network=11,155,111 dbversion=9
INFO [11-12|16:47:11.578] Load database journal from disk
INFO [11-12|16:47:11.578] Failed to load journal, discard it err="journal not found"
INFO [11-12|16:47:11.580] Opened ancient database database=/Users/ricky/ethereum/go-ethereum/geth-tutorial/geth/chaindata/ancient/state readonly=false
INFO [11-12|16:47:11.580] Initialized path database triecache=154.00MiB statecache=102.00MiB buffer=256.00MiB state-history="last 90000 blocks" journal-dir=/Users/ricky/ethereum/go-ethereum/geth-tutorial/geth/triedb
INFO [11-12|16:47:11.581]
INFO [11-12|16:47:11.581] ---------------------------------------------------------------------------------------------------------------------------------------------------------
INFO [11-12|16:47:11.581] Chain ID: 11155111 (sepolia)
INFO [11-12|16:47:11.581] Consensus: Beacon (proof-of-stake), merged from Ethash (proof-of-work)
INFO [11-12|16:47:11.581]
INFO [11-12|16:47:11.581] Pre-Merge hard forks (block based):
INFO [11-12|16:47:11.581] - Homestead: #0
INFO [11-12|16:47:11.581] - Tangerine Whistle (EIP 150): #0
INFO [11-12|16:47:11.581] - Spurious Dragon/1 (EIP 155): #0
INFO [11-12|16:47:11.581] - Spurious Dragon/2 (EIP 158): #0
INFO [11-12|16:47:11.581] - Byzantium: #0
INFO [11-12|16:47:11.581] - Constantinople: #0
INFO [11-12|16:47:11.581] - Petersburg: #0
INFO [11-12|16:47:11.581] - Istanbul: #0
INFO [11-12|16:47:11.581] - Muir Glacier: #0
INFO [11-12|16:47:11.581] - Berlin: #0
INFO [11-12|16:47:11.581] - London: #0
INFO [11-12|16:47:11.581]
INFO [11-12|16:47:11.581] Merge configured:
INFO [11-12|16:47:11.581] - Total terminal difficulty: 17000000000000000
INFO [11-12|16:47:11.581] - Merge netsplit block: #1735371
INFO [11-12|16:47:11.581]
INFO [11-12|16:47:11.581] Post-Merge hard forks (timestamp based):
INFO [11-12|16:47:11.581] - Shanghai: @1677557088
INFO [11-12|16:47:11.581] - Cancun: @1706655072 blob: (target: 3, max: 6, fraction: 3338477)
INFO [11-12|16:47:11.581] - Prague: @1741159776 blob: (target: 6, max: 9, fraction: 5007716)
INFO [11-12|16:47:11.581] - Osaka: @1760427360 blob: (target: 6, max: 9, fraction: 5007716)
INFO [11-12|16:47:11.581] - BPO1: @1761017184 blob: (target: 10, max: 15, fraction: 8346193)
INFO [11-12|16:47:11.581] - BPO2: @1761607008 blob: (target: 14, max: 21, fraction: 11684671)
INFO [11-12|16:47:11.581]
INFO [11-12|16:47:11.581] All fork specifications can be found at https://ethereum.github.io/execution-specs/src/ethereum/forks/
INFO [11-12|16:47:11.581]
INFO [11-12|16:47:11.581] ---------------------------------------------------------------------------------------------------------------------------------------------------------
INFO [11-12|16:47:11.581]
INFO [11-12|16:47:11.581] Loaded most recent local block number=0 hash=25a5cc..3e6dd9 age=4y2mo19h
INFO [11-12|16:47:11.581] Initialized transaction indexer range="last 2350000 blocks"
INFO [11-12|16:47:11.594] Enabled snap sync head=0 hash=25a5cc..3e6dd9
INFO [11-12|16:47:11.594] Gasprice oracle is ignoring threshold set threshold=2
WARN [11-12|16:47:11.594] Unclean shutdown detected booted=2025-11-12T16:44:50+0800 age=2m21s
INFO [11-12|16:47:11.594] Registered sync override service
INFO [11-12|16:47:11.594] Starting peer-to-peer node instance=Geth/v1.16.8-unstable-15ff378a-20251106/darwin-arm64/go1.25.1
INFO [11-12|16:47:11.617] New local node record seq=1,762,937,231,617 id=9e5933f4cc902c5c ip=127.0.0.1 udp=30303 tcp=30303
INFO [11-12|16:47:11.618] Started P2P networking self=enode://9103de72008bdc17df1cc94991bd668067adc534d5c6d1d278a0de012b15e80d637ddba4d9847acfbbc174b99a58a10e277821fd756bd9c42f36bd6af42831b2@127.0.0.1:30303
INFO [11-12|16:47:11.618] IPC endpoint opened url=/Users/ricky/ethereum/go-ethereum/geth-tutorial/geth.ipc
INFO [11-12|16:47:11.618] HTTP server started endpoint=127.0.0.1:8545 auth=false prefix= cors= vhosts=localhost
INFO [11-12|16:47:11.619] Started log indexer
WARN [11-12|16:47:11.619] Failed to open wallet url=extapi://geth-tutorial/clef/cle.. err="operation not supported on external signers"
INFO [11-12|16:47:12.640] New local node record seq=1,762,937,231,618 id=9e5933f4cc902c5c ip=221.216.147.63 udp=28622 tcp=30303
WARN [11-12|16:47:12.874] Beacon API request failed type=sync.ReqCheckpointData reqid=1 err="unexpected error from API endpoint \"/eth/v1/beacon/light_client/bootstrap/0x71cff47c7fde33703c7aa4c6ff4aeca6ccf929e0eb5ee8c12350e44230d9efba\": status code 429"
WARN [11-12|16:47:13.530] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
ERROR[11-12|16:47:13.811] blsync: checkpoint not available, but reported as finalized; specified checkpoint hash might be too old server=https://lodestar-sepolia.chainsafe.io
WARN [11-12|16:47:14.434] Beacon API request failed type=sync.ReqBeaconBlock reqid=3 err="unsupported fork: fulu"
WARN [11-12|16:47:24.560] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
WARN [11-12|16:47:25.312] Beacon API request failed type=sync.ReqBeaconBlock reqid=4 err="unsupported fork: fulu"
WARN [11-12|16:47:36.680] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
WARN [11-12|16:47:37.684] Beacon API request failed type=sync.ReqBeaconBlock reqid=5 err="unsupported fork: fulu"
WARN [11-12|16:47:46.594] Beacon client online, but no consensus updates received in a while. Please fix your beacon client to follow the chain!
WARN [11-12|16:47:49.234] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
WARN [11-12|16:47:50.144] Beacon API request failed type=sync.ReqBeaconBlock reqid=6 err="unsupported fork: fulu"
WARN [11-12|16:48:00.198] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
WARN [11-12|16:48:00.936] Beacon API request failed type=sync.ReqBeaconBlock reqid=7 err="unsupported fork: fulu"
WARN [11-12|16:48:13.633] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
WARN [11-12|16:48:14.540] Beacon API request failed type=sync.ReqBeaconBlock reqid=8 err="unsupported fork: fulu"
WARN [11-12|16:48:24.455] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
WARN [11-12|16:48:25.194] Beacon API request failed type=sync.ReqBeaconBlock reqid=9 err="unsupported fork: fulu"
WARN [11-12|16:48:36.685] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
WARN [11-12|16:48:37.581] Beacon API request failed type=sync.ReqBeaconBlock reqid=10 err="unsupported fork: fulu"
WARN [11-12|16:48:48.279] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
WARN [11-12|16:49:00.369] Head event stream error err="error decoding optimistic update event: invalid attested header: unsupported fork: fulu"
WARN [11-12|16:49:01.309] Beacon API request failed
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