On June 7, Arbitrum developers promptly fixed a bug in the sequencer mechanism, which led to a short pause in the execution of transaction batches on Ethereum.
Earlier today, there was a disruption in the Sequencer’s batch poster that caused batches not to be posted.
We’ll be publishing a full post-mortem later today, but let’s take this chance to look at the high-level overview.
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— Arbitrum Developers (💙,🧡) (@ArbitrumDevs) June 7, 2023
How the Arbitrum second-tier network bundles transactions into batches and sends them in one transfer to Ethereum. This allows you to reduce the load on the main blockchain and reduce commissions.
The sequencer is responsible for the formation and sending of packages, in the code for the on-chain publication of assemblies of which an error was found.
“Impact: Brief pause to finalize transactions on the network, otherwise the service was unaffected,” the team explained.
So, where is the bug? Well, it was in the batch poster.
When the Sequencer tried to post a batch on-chain, the bug hit and the transaction reverted.
Impact: A temporary pause to finalize transaction ordering on-chain, but otherwise the Sequencer’s service was not disrupted.
— Arbitrum Developers (💙,🧡) (@ArbitrumDevs) June 7, 2023
The failed batch transaction caused the funding mechanism to become out of sync. It consists of two wallets: a sequencer and a “gas refund”. The first, by definition, has a minimum balance and is programmatically replenished with the second.
Because the transaction was not completed, the sequencer wallet did not receive a refund of the ~5 ETH spent and could not send the next packet.
After fixing the error, the mechanism works normally.
“Summarizing, we can summarize that there was a bug in the packet handler, due to which it did not publish them on the network for a while. We will soon publish a detailed analysis, and we are pleased that the fault-tolerant system worked properly during the incident, ”the developers noted.
Recall that in May, the failure of the finalization of transactions occurred in Ethereum.
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