Key Takeaways
- Sui mainnet stalled for precisely 5 hours and 55 minutes on Could 29, ensuing from a bug within the Sui 1.72 launch, which halted onchain block manufacturing.
- Following a 6.6% drop in worth post-incident, builders deployed community patches to assist resume companies as regular.
- Sui’s dev crew has famous {that a} full incident assessment can be shared within the coming days.
Onchain Information Exhibits Block Manufacturing Halt for Sui Mainnet
The Sui blockchain skilled a extreme community stall, halting all block manufacturing for precisely 5 hours and 55 minutes. In keeping with onchain knowledge from Suiscan, the mainnet stopped processing new checkpoints, successfully freezing all decentralized finance ( DeFi) exercise. The Sui core crew confirmed the problem on X, stating {that a} crash bug within the fuel charging logic launched through the 1.72 launch triggered the disruption.
The community first alerted customers that it was experiencing a stall, warning that transactions could be delayed whereas builders labored on a repair. Throughout the outage, the community’s native token SUI dropped roughly 6.6%, reaching a low of $0.90 per unit earlier than partially recovering as soon as companies resumed.
The incident marked the second main downtime occasion for Sui in 2026, following the same January community stall that stored validators offline for over six hours.
The Technical Reasoning Behind the Breakdown
The fuel charging logic is a crucial element governing transaction price calculations, and a failure at this layer resulted in an entire community freeze fairly than degraded efficiency. At a excessive degree, the incident was attributable to an edge-case bug within the consensus commit logic associated to dealing with conflicting transactions, inflicting completely different validators to succeed in completely different conclusions when computing consensus commits.
The Sui core stack makes use of a number of layers of transaction processing, the place consensus produces an ordered stream of commits and deterministic execution turns these commits into checkpoints. As a result of validators noticed that greater than one-third of the stake was signing a special digest, certification turned unattainable.
Consequently, validators on the Sui mainnet have been pressured to manually establish the divergence, implement a repair to purge incorrect consensus knowledge, and allow corrected logic. Even after common operations resumed, some nodes have been nonetheless reported to be working with degraded efficiency.
Whereas the interruption was unintended, the community’s default safety-focused structure behaved as designed by stopping a user-visible fork. On the time of the outage, Sui ranked among the many prime blockchain platforms by whole worth locked (TVL), securing roughly $536 million throughout 137 protocols.
