Go-ethereum: CPU miner doesn't start in "light" mode

Created on 12 Jan 2018 · 2Comments · Source: ethereum/go-ethereum

Hi,

Can't start CPU miner in light mode using this command:
./geth --mine --syncmode "light" --cache 1024

Here is the log:

INFO [01-11|19:28:48] Starting peer-to-peer node instance=Geth/v1.8.0-unstable-83d16574/linux-amd64/go1.7.4
INFO [01-11|19:28:48] Allocated cache and file handles database=/root/.ethereum/geth/lightchaindata cache=1024 handles=1024
INFO [01-11|19:28:48] Initialised chain configuration config="{ChainID: 1 Homestead: 1150000 DAO: 1920000 DAOSupport: true EIP150: 2463000 EIP155: 2675000 EIP158: 2675000 Byzantium: 4370000 Engine: ethash}"
INFO [01-11|19:28:48] Disk storage enabled for ethash caches dir=/root/.ethereum/geth/ethash count=3
INFO [01-11|19:28:48] Disk storage enabled for ethash DAGs dir=/root/.ethash count=2
INFO [01-11|19:28:48] Added trusted checkpoint chain name="ETH mainnet"
INFO [01-11|19:28:48] Loaded most recent local header number=4893062 hash=7017f3…4483af td=2033194604220009882200
INFO [01-11|19:28:48] Starting P2P networking
INFO [01-11|19:28:50] UDP listener up self=enode://8e8fc781116940df5a710d065de695cde5778954019d95d5bba13fa423fb11392bfee091b49cc8f0a9b8e0cfe9b913c3a0c3216ef4555ef6031d3da1fdde396e@[::]:30303
WARN [01-11|19:28:50] Light client mode is an experimental feature
Fatal: ethereum service not running: unknown service

System information

Geth version: 1.8.0-unstable
OS & Version: Linux Debian

Expected behaviour

I should be able to start mining in light syncmade (using lightchaindata db)

Actual behaviour

Crash : Fatal: ethereum service not running: unknown service

Steps to reproduce the behaviour

Backtrace

[backtrace]

Source

julien-regnault

👍2

Most helpful comment

A light client cannot mine. It does not have the necessary state data locally on top of which to run the transactions. That being said, geth should most certainly not crash, rather report a proper error message for this.