tests/fail/data_race/local_variable_write_race.stderr

error: Undefined Behavior: Data race detected between (1) non-atomic write on thread `main` and (2) non-atomic write on thread `unnamed-ID` at ALLOC
  --> tests/fail/data_race/local_variable_write_race.rs:LL:CC
   |
LL |             *ptr = 127;
   |             ^^^^^^^^^^ (2) just happened here
   |
help: and (1) occurred earlier here
  --> tests/fail/data_race/local_variable_write_race.rs:LL:CC
   |
LL |     let mut val: u8 = 0;
   |                       ^
   = 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: this is on thread `unnamed-ID`
note: the current function got called indirectly due to this code
  --> tests/fail/data_race/local_variable_write_race.rs:LL:CC
   |
LL |       let t1 = std::thread::spawn(|| {
   |  ______________^
LL | |         while P.load(Relaxed).is_null() {
LL | |             std::hint::spin_loop();
...  |
LL | |     });
   | |______^

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

error: aborting due to 1 previous error