concurrent-ruby: `AtomicReference#update` livelocks when the stored value is `Float::NAN`_CVE-2026-54904
concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::AtomicReference#update can enter a permanent busy retry loop when the current value is Float::NAN. The issue is caused by the interaction between AtomicReference#update, which retries until com...