The Sui mainnet is back online after a bug in its latest software release brought the network to a standstill for roughly 5 hours and 55 minutes. Validators coordinated a fix and upgraded to a patched version, restoring normal checkpoint production on May 29.
The culprit was a flaw in the gas charging logic introduced in Sui’s 1.72 release. In English: the code that calculates how much users pay for transactions broke, and the entire network stopped processing new blocks as a result.
What happened and how it got fixed
The outage began on May 28, when validators running the 1.72 update encountered the bug and stopped producing new checkpoints. No new transactions could be finalized, which effectively froze the network in place.
Recovery wasn’t as simple as flipping a switch. Sui’s consensus mechanism required validators holding more than two-thirds of all staked tokens to upgrade to the patched software before the chain could resume.
