Fix local testnets starting from Electra at genesis

[michaelsproul]

At the moment we get an SSZ decoding error trying to start a Kurtosis testnet with ELECTRA_FORK_EPOCH: 0.

Jan 21 01:01:17.667 CRIT Failed to start beacon node reason: Built-in genesis state SSZ bytes are invalid: OffsetOutOfBounds(522733568)

[michaelsproul]

This seems to be an issue upstream in ethereum-genesis-generator, possibly eth2-testnet-genesis. The state generated with ELECTRA_FORK_EPOCH: 0 is actually a Deneb state, as confirmed with:

lcli pretty-ssz BeaconStateDeneb genesis.ssz

[michaelsproul]

Have asked maintainers, but the only PR I can find related to Electra is:

• add support for electra/kaustinen genesis protolambda/eth2-testnet-genesis#17

[chong-he]

Not sure if this is still an issue? Try to start a local testnet with electra_fork_epoch: 0 on the stable branch and it works fine:

diff --git a/scripts/local_testnet/network_params.yaml b/scripts/local_testnet/network_params.yaml
index b53d88e52..00bcf71f6 100644
--- a/scripts/local_testnet/network_params.yaml
+++ b/scripts/local_testnet/network_params.yaml
@@ -9,6 +9,7 @@ participants:
     count: 4
 network_params:
   deneb_fork_epoch: 0
+  electra_fork_epoch: 0
   seconds_per_slot: 3
 global_log_level: debug
 snooper_enabled: false

Perhaps there were some updates in Kurtosis that solved this issue?

[michaelsproul]

Nice! Yeah I think Kurtosis has probably been updated now that Electra is live on mainnet.

I wonder if we should update our default local testnet to start from Electra?

[chong-he]

Upon testing, I found that the network is in Electra anyway since genesis. I believe this is due to the PR: ethpandaops/ethereum-package#940

Not sure if it is worth removing this line?

lighthouse/scripts/local_testnet/network_params.yaml

Line 11 in 7759cb8

deneb_fork_epoch: 0

[michaelsproul]

Fixed now!

And closed by:

• Update kurtosis config and EL images #7570