thread safety

Thread safety is a critical concern in concurrent programming, particularly when using asynchronous runtimes like Tokio in Rust. The tag covers a specific vulnerability (CVE-2021-38191) where Tokio's task-abort semantics could drop a future on the wrong thread, violating Rust's thread-safety guarantees for non-Send types such as Rc and RefCell. This issue affected applications using LocalSet or spawn_local, leading to race conditions and crashes. The fix in Tokio 1.8.x ensures that aborted tasks are properly handled to maintain thread safety. Discussions under this tag focus on understanding the bug, its implications for real-world Rust code, and best practices for avoiding similar concurrency pitfalls.