A sequencer bug was the reason for two outages on Coinbase's Layer 2 community Base final week, based on a postmortem.
base engineering crew stated A autopsy on Saturday recognized a bug within the sequencer's block development logic that allowed “stale journal state” to persist after a failed transaction validation.
“An invalid transaction was acquired by the block builder and failed throughout execution as anticipated, however the journal state containing accessed accounts and storage slots was inadvertently not cleared,” the crew stated.
base layer 2 community Run a single sequencer. Meaning one bug can convey every part down. It’s a centralized blockchain element that orders transactions and has been the reason for outages for different layer 2 chains akin to Arbitrum, OP Mainnet, and zkSync Period.
Two outages occurred on the Base mainnet on Thursday and Friday, with the primary incident lasting 116 minutes and the second incident lasting 20 minutes.
Sequencer and validator nodes have been unable to advance past the invalid block till the brand new layer 2 block was utterly stopped and the sequence was restored.
The crew fastened the failure by patching the sequencer in order that the journal state is up to date correctly throughout execution.
Nevertheless, they stated mitigation took longer than anticipated “as a consequence of infrastructure circumstances unrelated to the unique bug.”
Additionally, after a system reset, a “race situation” occurred and the sequencer couldn't sustain, inflicting a second outage.
Associated: Coinbase’s Base resumes block manufacturing after 2-hour outage
Sooner or later, the Base engineering crew plans to enhance the “fuzz take a look at” of the protocol. This contains bombarding the system with massive quantities of random, malformed, or sudden enter to search out bugs, and constructing in “sleek restoration” in order that validator nodes don’t have to be manually restarted within the occasion of future incidents.
This isn’t the primary time Base has been out of service.
This isn’t the primary sequencer-related outage for Base, which stopped producing blocks for 17 minutes in September 2024 and for about half-hour in August 2025.
Base is the second largest Layer 2 community by whole quantity secured, at just below $11 billion. Based on To L2 beat.
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