All news with #go runtime tag

How Cloudflare Found and Fixed a Bug in Go's ARM64 Compiler

🔍 Cloudflare engineers describe discovering a rare race condition in the Go arm64 compiler that caused goroutine stack-unwinding crashes in production. They traced sporadic fatal panics and segfaults to async preemption interrupting a split stack-pointer adjustment, leaving an invalid stack frame. A minimal reproducer showed the assembler could split a large ADD into multiple instructions, creating a one-instruction window where preemption caused unwinder corruption. The issue was fixed upstream in go1.23.12, go1.24.6, and go1.25.0.