Cloudflare Discovers Race Condition Bug in Go's ARM64 Compiler
By
jgrahamc
Front-window bakery material. Catches the eye, delivers the goods.
Summary
Cloudflare engineers discovered a race condition bug in Go's arm64 compiler due to their massive scale of handling 84 million HTTP requests per second. The article details their investigation process from encountering strange panics in production to identifying the root cause in the compiler's code generation. They traced the issue to specific assembly code patterns that could cause data races under certain conditions, ultimately leading to a fix in the Go compiler.
Key quotes
· 4 pulledEvery second, 84 million HTTP requests are hitting Cloudflare across our fleet of data centers in 330 cities.
It means that even the rarest of bugs can show up frequently.
It was our scale that recently led us to discover a bug in Go's arm64 compiler which causes a race condition in the generated code.
This post breaks down how we first encountered the bug, investigated it, and ultimately drove to the root cause.
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