error: Undefined Behavior: trying to join an already joined thread
  --> $DIR/libc_pthread_join_multiple.rs:LL:CC
   |
LL | ...   assert_eq!(libc::pthread_join(native_copy, ptr::null_mut()), 0);
   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ trying to join an already joined 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_multiple.rs:LL:CC

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to previous error