A previously undetected bug in Ethereum’s Prysm consensus client, introduced more than a month before the Fusaka upgrade, has been identified as the root cause of a network participation drop that briefly disrupted Ethereum earlier this month. According to a post-mortem published by Ethereum developer Terence Tsao, the incident occurred on Dec. 4, when Prysm nodes began experiencing severe resource exhaustion, leading to missed attestations, reduced validator participation and significant lost rewards. What Went Wrong With PrysmThe issue stemmed from a bug introduced in Prysm PR 15965, which had been deployed on Ethereum testnets roughly a month before the Fusaka mainnet upgrade
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