error: Undefined Behavior: trying to join a detached thread --> $DIR/libc_pthread_join_main.rs:LL:CC | LL | assert_eq!(libc::pthread_join(thread_id, ptr::null_mut()), 0); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ trying to join a detached thread | = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information = note: BACKTRACE: = note: inside closure at $DIR/libc_pthread_join_main.rs:LL:CC note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to previous error