Base mainnet briefly halted twice: Sequencer state management bug caused block production interruption
Foresight News reported that Base released a post-mortem report stating that the mainnet experienced two block production interruptions on June 25 and 26, lasting approximately 116 minutes and 20 minutes, respectively. The official emphasized that the incident did not affect on-chain asset security and user funds remained accessible at all times. The root cause of the outage was a flaw in the sequencer’s block construction logic: after a transaction execution failure, the system did not correctly clean up the historical journal state, leading to abnormal gas calculation for subsequent valid transactions, which then generated invalid state transition blocks and caused the entire L2 network to stop producing blocks. During the interruption, the network experienced issues including complete block production halt, inability for transactions to be recorded on-chain, and mempool congestion. User-submitted eth_sendRawTransaction requests consistently returned errors.
The issue was subsequently fixed by the official team through a patch (PR #3806) and block production was restored. However, due to a race condition in engine reset during sequencer cluster restart, the resynchronization was hindered, which also indirectly led to the second short downtime on the following day.
Going forward, Base stated it will focus on strengthening protocol-level fuzz testing and stress testing capabilities to detect abnormal transaction paths earlier, while also upgrading its monitoring and operations systems and introducing a more “graceful recovery” mechanism to improve the network’s rapid recovery ability in the event of similar failures in the future.
Disclaimer: The content of this article solely reflects the author's opinion and does not represent the platform in any capacity. This article is not intended to serve as a reference for making investment decisions.
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