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Ethereum Prysm Details Fusaka Upgrade Resource Exhaustion Impact

Ethereum Prysm Details Fusaka Upgrade Resource Exhaustion Impact

Prysm’s post-mortem confirms that the Dec. 4 Fusaka upgrade caused validators to lose 382 ETH due to resource exhaustion from a client bug, disrupting network participation before stability was restored.

ETH

Summary

Prysm developers confirmed that the Dec. 4 Fusaka mainnet upgrade triggered a Prysm client bug leading to network instability and validator losses. The bug caused resource exhaustion during state recomputation, resulting in validators missing rewards totaling 382 ETH, worth about ¥188.6M at the time. During the 42-epoch disruption, participation dropped to 75% and 248 out of 1,344 blocks were missed. Network stability recovered above 95% participation after updates in versions v7.0.1 and v7.1.0 resolved the issue.

Terms & Concepts
  • Epoch: A specific period in blockchain protocol operations during which validators perform tasks such as proposing and attesting blocks.
  • Validator: Participants in a proof-of-stake blockchain who lock up cryptocurrency to propose and validate new blocks.
  • Resource Exhaustion: A system condition where computing resources like memory or CPU are fully consumed, impairing performance or causing failures.