error: Undefined Behavior: unlocked a default mutex that was not locked by the current thread
  --> $DIR/libc_pthread_mutex_wrong_owner.rs:LL:CC
   |
LL | ...t_eq!(libc::pthread_mutex_unlock(lock_copy.0.get() as *mut _), 0);
   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unlocked a default mutex that was not locked by the current 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: inside closure at $DIR/libc_pthread_mutex_wrong_owner.rs:LL:CC

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

error: aborting due to previous error