error: Undefined Behavior: trying to join itself
  --> tests/fail-dep/concurrency/libc_pthread_join_self.rs:LL:CC
   |
LL |             assert_eq!(libc::pthread_join(native, ptr::null_mut()), 0);
   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
   |
   = 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 on thread `unnamed-ID`:
   = note: inside closure at tests/fail-dep/concurrency/libc_pthread_join_self.rs:LL:CC

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

error: aborting due to 1 previous error