Anatomist

The story begins with an issue reported by our team during the Fuel Attackathon, an audit competition held on Immunefi, along with 20+ other Sway miscompilation bugs. These bugs, however, were not prioritized for immediate fixing. Months later, shortly after fuel launched its mainnet, we noticed Swaylend transactions failing with error code 123. This error, which rarely occurs under normal operation, coincided with the impact of one of the compiler bugs we had reported during the Attackathon. Our further investigation confirmed that the bug was indeed the root cause. Consequently, Swaylend was paused until the compiler bug was fixed and a newly recompiled version was deployed. However, a 2-day shutdown had already occurred.