error: Undefined Behavior: Data race detected between (1) non-atomic write on thread `unnamed-ID` and (2) deallocation on thread `unnamed-ID` at ALLOC
  --> tests/fail/data_race/dealloc_write_race1.rs:LL:CC
   |
LL | /             __rust_dealloc(
LL | |
LL | |                 ptr.0 as *mut _,
LL | |                 std::mem::size_of::<usize>(),
LL | |                 std::mem::align_of::<usize>(),
LL | |             );
   | |_____________^ (2) just happened here
   |
help: and (1) occurred earlier here
  --> tests/fail/data_race/dealloc_write_race1.rs:LL:CC
   |
LL |             *ptr.0 = 2;
   |             ^^^^^^^^^^
   = 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 (of the first span) on thread `unnamed-ID`:
   = note: inside closure at tests/fail/data_race/dealloc_write_race1.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