Ethereum consensus layer client Prysm team releases Fusaka mainnet failure post-mortem report

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Wu Shuo learned that the Ethereum consensus layer client Prysm team has released the post-mortem report on the Fusaka mainnet outage on December 4th. The outage was caused by nearly all Prysm nodes exhausting resources when processing a specific proof, due to Prysm beacon nodes performing high-cost state recomputations for asynchronous proofs. The incident resulted in missing 41 epochs, network participation dropping to 75%, and validators losing approximately 382 ETH in rewards. The team initially addressed this with the --disable-last-epoch-target flag as a temporary fix, and then fundamentally changed the proof verification logic in versions v7.0.1 and v7.1.0 to implement a permanent fix. This incident exposed deficiencies in the team’s communication and testing, but also highlighted the crucial role of Ethereum client diversity in preventing more severe finality risks.

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