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094c36db97
Fix a bug in `verify_header_signature` which tripped up some Lighthouse nodes at the Fusaka fork. The bug was a latent bug in a function that has been present for a long time, but only used by slashers. With Fulu it entered the critical path of blob/column verification -- call stack: - `FetchBlobsBeaconAdapter::process_engine_blobs` - `BeaconChain::process_engine_blobs` - `BeaconChain::check_engine_blobs_availability_and_import` - `BeaconChain::check_blob_header_signature_and_slashability` - `verify_header_signature` Thanks @eserilev for quickly diagnosing the root cause. Change `verify_header_signature` to use `ChainSpec::fork_at_epoch` to compute the `Fork`, rather than using the head state's fork. At a fork boundary the head state's fork is stale and lacks the data for the new fork. Using `fork_at_epoch` ensures that we use the correct fork data and validate transition block's signature correctly. Co-Authored-By: Michael Sproul <michael@sigmaprime.io>