How we found a bug in Go's arm64 compiler

This post details Cloudflare's discovery and resolution of a race condition bug in Go's arm64 compiler. The bug, identified through extensive monitoring of their global network, caused sporadic panics and segmentation faults during stack unwinding. Cloudflare's investigation traced the issue to the interaction between Go's asynchronous preemption mechanism and the `github.com/vishvananda/netlink` library, leading to the identification of a specific bug in the Go compiler's generated code for arm64. Cloudflare's contribution involved deep debugging, correlation with existing Go issues, and ultimately driving towards a root cause analysis that benefits the broader Go ecosystem.