Mention and number the components of a race in the order the interpreter sees them

53 files changed, 113 insertions, 113 deletions

diff --git a/src/tools/miri/src/concurrency/data_race.rs b/src/tools/miri/src/concurrency/data_race.rs
index 5dcaebadc42..96463279668 100644
--- a/src/tools/miri/src/concurrency/data_race.rs
+++ b/src/tools/miri/src/concurrency/data_race.rs
@@ -811,15 +811,15 @@ impl VClockAlloc {
         Err(err_machine_stop!(TerminationInfo::DataRace {
             ptr: ptr_dbg,
             op1: RacingOp {
-                action: action.to_string(),
-                thread_info: current_thread_info,
-                span: current_clocks.clock.as_slice()[current_index.index()].span_data(),
-            },
-            op2: RacingOp {
                 action: other_action.to_string(),
                 thread_info: other_thread_info,
                 span: other_clock.as_slice()[other_thread.index()].span_data(),
             },
+            op2: RacingOp {
+                action: action.to_string(),
+                thread_info: current_thread_info,
+                span: current_clocks.clock.as_slice()[current_index.index()].span_data(),
+            },
         }))?
     }
 
diff --git a/src/tools/miri/src/diagnostics.rs b/src/tools/miri/src/diagnostics.rs
index 2087d0cb548..035c0e64233 100644
--- a/src/tools/miri/src/diagnostics.rs
+++ b/src/tools/miri/src/diagnostics.rs
@@ -69,7 +69,7 @@ impl fmt::Display for TerminationInfo {
             DataRace { ptr, op1, op2 } =>
                 write!(
                     f,
-                    "Data race detected between (1) {} on {} and (2) {} on {} at {ptr:?}. (1) just happened here",
+                    "Data race detected between (1) {} on {} and (2) {} on {} at {ptr:?}. (2) just happened here",
                     op1.action, op1.thread_info, op2.action, op2.thread_info
                 ),
         }
@@ -222,9 +222,9 @@ pub fn report_error<'tcx, 'mir>(
                 vec![(Some(*span), format!("the `{link_name}` symbol is defined here"))],
             Int2PtrWithStrictProvenance =>
                 vec![(None, format!("use Strict Provenance APIs (https://doc.rust-lang.org/nightly/std/ptr/index.html#strict-provenance, https://crates.io/crates/sptr) instead"))],
-            DataRace { op2, .. } =>
+            DataRace { op1, .. } =>
                 vec![
-                    (Some(op2.span), format!("and (2) occurred earlier here")),
+                    (Some(op1.span), format!("and (1) occurred earlier here")),
                     (None, format!("this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior")),
                     (None, format!("see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information")),
                 ],
diff --git a/src/tools/miri/tests/fail/data_race/alloc_read_race.rs b/src/tools/miri/tests/fail/data_race/alloc_read_race.rs
index ba1d54e36c3..2698c63a445 100644
--- a/src/tools/miri/tests/fail/data_race/alloc_read_race.rs
+++ b/src/tools/miri/tests/fail/data_race/alloc_read_race.rs
@@ -37,7 +37,7 @@ pub fn main() {
             let pointer = &*ptr.0;
 
             // Note: could also error due to reading uninitialized memory, but the data-race detector triggers first.
-            *pointer.load(Ordering::Relaxed) //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Allocate on thread `<unnamed>`
+            *pointer.load(Ordering::Relaxed) //~ ERROR: Data race detected between (1) Allocate on thread `<unnamed>` and (2) Read on thread `<unnamed>`
         });
 
         j1.join().unwrap();
diff --git a/src/tools/miri/tests/fail/data_race/alloc_read_race.stderr b/src/tools/miri/tests/fail/data_race/alloc_read_race.stderr
index 59b38024161..5b809722c70 100644
--- a/src/tools/miri/tests/fail/data_race/alloc_read_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/alloc_read_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Allocate on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Allocate on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/alloc_read_race.rs:LL:CC
    |
 LL |             *pointer.load(Ordering::Relaxed)
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Allocate on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Allocate on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/alloc_read_race.rs:LL:CC
    |
 LL |             pointer.store(Box::into_raw(Box::new_uninit()), Ordering::Relaxed);
diff --git a/src/tools/miri/tests/fail/data_race/alloc_write_race.rs b/src/tools/miri/tests/fail/data_race/alloc_write_race.rs
index 9f85fb13ab3..b78d5ef27d3 100644
--- a/src/tools/miri/tests/fail/data_race/alloc_write_race.rs
+++ b/src/tools/miri/tests/fail/data_race/alloc_write_race.rs
@@ -35,7 +35,7 @@ pub fn main() {
 
         let j2 = spawn(move || {
             let pointer = &*ptr.0;
-            *pointer.load(Ordering::Relaxed) = 2; //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Allocate on thread `<unnamed>`
+            *pointer.load(Ordering::Relaxed) = 2; //~ ERROR: Data race detected between (1) Allocate on thread `<unnamed>` and (2) Write on thread `<unnamed>`
         });
 
         j1.join().unwrap();
diff --git a/src/tools/miri/tests/fail/data_race/alloc_write_race.stderr b/src/tools/miri/tests/fail/data_race/alloc_write_race.stderr
index 0564e4b5bf5..8520bcf4e4e 100644
--- a/src/tools/miri/tests/fail/data_race/alloc_write_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/alloc_write_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Allocate on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Allocate on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/alloc_write_race.rs:LL:CC
    |
 LL |             *pointer.load(Ordering::Relaxed) = 2;
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Allocate on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Allocate on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/alloc_write_race.rs:LL:CC
    |
 LL |                 .store(Box::into_raw(Box::<usize>::new_uninit()) as *mut usize, Ordering::Relaxed);
diff --git a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.rs b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.rs
index 4aa96de877a..3f811d0f64d 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.rs
+++ b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.rs
@@ -20,7 +20,7 @@ pub fn main() {
         });
 
         let j2 = spawn(move || {
-            (&*c.0).load(Ordering::SeqCst) //~ ERROR: Data race detected between (1) Atomic Load on thread `<unnamed>` and (2) Write on thread `<unnamed>`
+            (&*c.0).load(Ordering::SeqCst) //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Load on thread `<unnamed>`
         });
 
         j1.join().unwrap();
diff --git a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.stderr b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.stderr
index ab7a6178102..e25629e14ea 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race1.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Atomic Load on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Load on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/atomic_read_na_write_race1.rs:LL:CC
    |
 LL |             (&*c.0).load(Ordering::SeqCst)
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Atomic Load on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Load on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/atomic_read_na_write_race1.rs:LL:CC
    |
 LL |             *(c.0 as *mut usize) = 32;
diff --git a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.rs b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.rs
index 135017d35b4..34fb3ac066f 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.rs
+++ b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.rs
@@ -23,7 +23,7 @@ pub fn main() {
 
         let j2 = spawn(move || {
             let atomic_ref = &mut *c.0;
-            *atomic_ref.get_mut() = 32; //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Load on thread `<unnamed>`
+            *atomic_ref.get_mut() = 32; //~ ERROR: Data race detected between (1) Atomic Load on thread `<unnamed>` and (2) Write on thread `<unnamed>`
         });
 
         j1.join().unwrap();
diff --git a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.stderr b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.stderr
index cd8e095a6e2..6953b1403b4 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_read_na_write_race2.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Load on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Atomic Load on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/atomic_read_na_write_race2.rs:LL:CC
    |
 LL |             *atomic_ref.get_mut() = 32;
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Load on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Atomic Load on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/atomic_read_na_write_race2.rs:LL:CC
    |
 LL |             atomic_ref.load(Ordering::SeqCst)
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.rs b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.rs
index 345b53ab5cd..63b0806f3bb 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.rs
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.rs
@@ -23,7 +23,7 @@ pub fn main() {
 
         let j2 = spawn(move || {
             let atomic_ref = &mut *c.0;
-            *atomic_ref.get_mut() //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>`
+            *atomic_ref.get_mut() //~ ERROR: Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Read on thread `<unnamed>`
         });
 
         j1.join().unwrap();
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.stderr b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.stderr
index b339e5adf8f..e52b8895a6a 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race1.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/atomic_write_na_read_race1.rs:LL:CC
    |
 LL |             *atomic_ref.get_mut()
-   |             ^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/atomic_write_na_read_race1.rs:LL:CC
    |
 LL |             atomic_ref.store(32, Ordering::SeqCst)
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.rs b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.rs
index bc37f6442ea..9092254be21 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.rs
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.rs
@@ -20,7 +20,7 @@ pub fn main() {
         });
 
         let j2 = spawn(move || {
-            (&*c.0).store(32, Ordering::SeqCst); //~ ERROR: Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Read on thread `<unnamed>`
+            (&*c.0).store(32, Ordering::SeqCst); //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>`
         });
 
         j1.join().unwrap();
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.stderr b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.stderr
index 39686203491..513d13b0349 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_read_race2.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/atomic_write_na_read_race2.rs:LL:CC
    |
 LL |             (&*c.0).store(32, Ordering::SeqCst);
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/atomic_write_na_read_race2.rs:LL:CC
    |
 LL |             let _val = *(c.0 as *mut usize);
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.rs b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.rs
index f1647ce4a9d..5a713905f4e 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.rs
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.rs
@@ -20,7 +20,7 @@ pub fn main() {
         });
 
         let j2 = spawn(move || {
-            (&*c.0).store(64, Ordering::SeqCst); //~ ERROR: Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Write on thread `<unnamed>`
+            (&*c.0).store(64, Ordering::SeqCst); //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>`
         });
 
         j1.join().unwrap();
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.stderr b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.stderr
index fd360797d34..2ff70ef1f6d 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race1.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/atomic_write_na_write_race1.rs:LL:CC
    |
 LL |             (&*c.0).store(64, Ordering::SeqCst);
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/atomic_write_na_write_race1.rs:LL:CC
    |
 LL |             *(c.0 as *mut usize) = 32;
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.rs b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.rs
index 343b46ea4eb..5848aa262b3 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.rs
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.rs
@@ -23,7 +23,7 @@ pub fn main() {
 
         let j2 = spawn(move || {
             let atomic_ref = &mut *c.0;
-            *atomic_ref.get_mut() = 32; //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>`
+            *atomic_ref.get_mut() = 32; //~ ERROR: Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Write on thread `<unnamed>`
         });
 
         j1.join().unwrap();
diff --git a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.stderr b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.stderr
index 4e2494cf57b..166b4d2269a 100644
--- a/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.stderr
+++ b/src/tools/miri/tests/fail/data_race/atomic_write_na_write_race2.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/atomic_write_na_write_race2.rs:LL:CC
    |
 LL |             *atomic_ref.get_mut() = 32;
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Atomic Store on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^ Data race detected between (1) Atomic Store on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/atomic_write_na_write_race2.rs:LL:CC
    |
 LL |             atomic_ref.store(64, Ordering::SeqCst);
diff --git a/src/tools/miri/tests/fail/data_race/dangling_thread_async_race.stderr b/src/tools/miri/tests/fail/data_race/dangling_thread_async_race.stderr
index aba051a2b63..a08b21ab0e4 100644
--- a/src/tools/miri/tests/fail/data_race/dangling_thread_async_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/dangling_thread_async_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/dangling_thread_async_race.rs:LL:CC
    |
 LL |             *c.0 = 64;
-   |             ^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/dangling_thread_async_race.rs:LL:CC
    |
 LL |             *c.0 = 32;
diff --git a/src/tools/miri/tests/fail/data_race/dangling_thread_race.rs b/src/tools/miri/tests/fail/data_race/dangling_thread_race.rs
index 3ead4eedd7f..4c7fbdd7fe6 100644
--- a/src/tools/miri/tests/fail/data_race/dangling_thread_race.rs
+++ b/src/tools/miri/tests/fail/data_race/dangling_thread_race.rs
@@ -33,6 +33,6 @@ fn main() {
     spawn(|| ()).join().unwrap();
 
     unsafe {
-        *c.0 = 64; //~ ERROR: Data race detected between (1) Write on thread `main` and (2) Write on thread `<unnamed>`
+        *c.0 = 64; //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `main`
     }
 }
diff --git a/src/tools/miri/tests/fail/data_race/dangling_thread_race.stderr b/src/tools/miri/tests/fail/data_race/dangling_thread_race.stderr
index dc35ccf3545..aa2e6a6f712 100644
--- a/src/tools/miri/tests/fail/data_race/dangling_thread_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/dangling_thread_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `main` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `main` at ALLOC. (2) just happened here
   --> $DIR/dangling_thread_race.rs:LL:CC
    |
 LL |         *c.0 = 64;
-   |         ^^^^^^^^^ Data race detected between (1) Write on thread `main` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |         ^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `main` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/dangling_thread_race.rs:LL:CC
    |
 LL |             *c.0 = 32;
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_read_race1.rs b/src/tools/miri/tests/fail/data_race/dealloc_read_race1.rs
index a94459ca4eb..18593cf56ae 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_read_race1.rs
+++ b/src/tools/miri/tests/fail/data_race/dealloc_read_race1.rs
@@ -25,7 +25,7 @@ pub fn main() {
 
         let j2 = spawn(move || {
             __rust_dealloc(
-                //~^ ERROR: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Read on thread `<unnamed>`
+                //~^ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>`
                 ptr.0 as *mut _,
                 std::mem::size_of::<usize>(),
                 std::mem::align_of::<usize>(),
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_read_race1.stderr b/src/tools/miri/tests/fail/data_race/dealloc_read_race1.stderr
index fbeab37e17f..5e546646479 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_read_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_read_race1.stderr
@@ -1,4 +1,4 @@
-error: Undefined Behavior: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/dealloc_read_race1.rs:LL:CC
    |
 LL | /             __rust_dealloc(
@@ -7,9 +7,9 @@ LL | |                 ptr.0 as *mut _,
 LL | |                 std::mem::size_of::<usize>(),
 LL | |                 std::mem::align_of::<usize>(),
 LL | |             );
-   | |_____________^ Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+   | |_____________^ Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/dealloc_read_race1.rs:LL:CC
    |
 LL |             let _val = *ptr.0;
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_read_race2.rs b/src/tools/miri/tests/fail/data_race/dealloc_read_race2.rs
index 6e6b6af5a6f..a6f83d489e5 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_read_race2.rs
+++ b/src/tools/miri/tests/fail/data_race/dealloc_read_race2.rs
@@ -28,7 +28,7 @@ pub fn main() {
         });
 
         let j2 = spawn(move || {
-            // Also an error of the form: Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>`
+            // Also an error of the form: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Read on thread `<unnamed>`
             // but the invalid allocation is detected first.
             *ptr.0 //~ ERROR: dereferenced after this allocation got freed
         });
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.rs b/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.rs
index ee3c66fb197..c82bfed09ee 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.rs
+++ b/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.rs
@@ -35,7 +35,7 @@ pub fn main() {
                 sleep(Duration::from_millis(200));
 
                 // Now `stack_var` gets deallocated.
-            } //~ ERROR: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Read on thread `<unnamed>`
+            } //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>`
         });
 
         let j2 = spawn(move || {
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.stderr b/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.stderr
index 9ef9bf35ae7..beb70c5a7fa 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_read_race_stack.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/dealloc_read_race_stack.rs:LL:CC
    |
 LL |             }
-   |             ^ Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^ Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/dealloc_read_race_stack.rs:LL:CC
    |
 LL |             *pointer.load(Ordering::Acquire)
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_write_race1.rs b/src/tools/miri/tests/fail/data_race/dealloc_write_race1.rs
index 041df291ed1..1e93a6cb094 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_write_race1.rs
+++ b/src/tools/miri/tests/fail/data_race/dealloc_write_race1.rs
@@ -24,7 +24,7 @@ pub fn main() {
 
         let j2 = spawn(move || {
             __rust_dealloc(
-                //~^ ERROR: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Write on thread `<unnamed>`
+                //~^ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>`
                 ptr.0 as *mut _,
                 std::mem::size_of::<usize>(),
                 std::mem::align_of::<usize>(),
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_write_race1.stderr b/src/tools/miri/tests/fail/data_race/dealloc_write_race1.stderr
index 75a98cc5d7d..cc4c4524ba2 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_write_race1.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_write_race1.stderr
@@ -1,4 +1,4 @@
-error: Undefined Behavior: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/dealloc_write_race1.rs:LL:CC
    |
 LL | /             __rust_dealloc(
@@ -7,9 +7,9 @@ LL | |                 ptr.0 as *mut _,
 LL | |                 std::mem::size_of::<usize>(),
 LL | |                 std::mem::align_of::<usize>(),
 LL | |             );
-   | |_____________^ Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   | |_____________^ Data race detected between (1) Write on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/dealloc_write_race1.rs:LL:CC
    |
 LL |             *ptr.0 = 2;
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_write_race2.rs b/src/tools/miri/tests/fail/data_race/dealloc_write_race2.rs
index b94fa8a14a2..385584db27f 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_write_race2.rs
+++ b/src/tools/miri/tests/fail/data_race/dealloc_write_race2.rs
@@ -27,7 +27,7 @@ pub fn main() {
         });
 
         let j2 = spawn(move || {
-            // Also an error of the form: Data race detected between (1) Write on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>`
+            // Also an error of the form: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Write on thread `<unnamed>`
             // but the invalid allocation is detected first.
             *ptr.0 = 2; //~ ERROR: dereferenced after this allocation got freed
         });
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.rs b/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.rs
index 78f11c14fb1..259fbdc497a 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.rs
+++ b/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.rs
@@ -35,7 +35,7 @@ pub fn main() {
                 sleep(Duration::from_millis(200));
 
                 // Now `stack_var` gets deallocated.
-            } //~ ERROR: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Write on thread `<unnamed>`
+            } //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>`
         });
 
         let j2 = spawn(move || {
diff --git a/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.stderr b/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.stderr
index f2fc338b33f..5f9f4f9bee4 100644
--- a/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.stderr
+++ b/src/tools/miri/tests/fail/data_race/dealloc_write_race_stack.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/dealloc_write_race_stack.rs:LL:CC
    |
 LL |             }
-   |             ^ Data race detected between (1) Deallocate on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^ Data race detected between (1) Write on thread `<unnamed>` and (2) Deallocate on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/dealloc_write_race_stack.rs:LL:CC
    |
 LL |             *pointer.load(Ordering::Acquire) = 3;
diff --git a/src/tools/miri/tests/fail/data_race/enable_after_join_to_main.stderr b/src/tools/miri/tests/fail/data_race/enable_after_join_to_main.stderr
index 620cb37859c..84d1c0bf7e6 100644
--- a/src/tools/miri/tests/fail/data_race/enable_after_join_to_main.stderr
+++ b/src/tools/miri/tests/fail/data_race/enable_after_join_to_main.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/enable_after_join_to_main.rs:LL:CC
    |
 LL |             *c.0 = 64;
-   |             ^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/enable_after_join_to_main.rs:LL:CC
    |
 LL |             *c.0 = 32;
diff --git a/src/tools/miri/tests/fail/data_race/fence_after_load.rs b/src/tools/miri/tests/fail/data_race/fence_after_load.rs
index 8de61d14ac1..0648aa55f4a 100644
--- a/src/tools/miri/tests/fail/data_race/fence_after_load.rs
+++ b/src/tools/miri/tests/fail/data_race/fence_after_load.rs
@@ -20,5 +20,5 @@ fn main() {
     // The fence is useless, since it did not happen-after the `store` in the other thread.
     // Hence this is a data race.
     // Also see https://github.com/rust-lang/miri/issues/2192.
-    unsafe { V = 2 } //~ERROR: Data race detected between (1) Write on thread `main` and (2) Write on thread `<unnamed>`
+    unsafe { V = 2 } //~ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `main`
 }
diff --git a/src/tools/miri/tests/fail/data_race/fence_after_load.stderr b/src/tools/miri/tests/fail/data_race/fence_after_load.stderr
index 0bd36067d95..c30d2354e76 100644
--- a/src/tools/miri/tests/fail/data_race/fence_after_load.stderr
+++ b/src/tools/miri/tests/fail/data_race/fence_after_load.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `main` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `main` at ALLOC. (2) just happened here
   --> $DIR/fence_after_load.rs:LL:CC
    |
 LL |     unsafe { V = 2 }
-   |              ^^^^^ Data race detected between (1) Write on thread `main` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |              ^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `main` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/fence_after_load.rs:LL:CC
    |
 LL |         unsafe { V = 1 }
diff --git a/src/tools/miri/tests/fail/data_race/read_write_race.rs b/src/tools/miri/tests/fail/data_race/read_write_race.rs
index f18d2da8315..d996141db3e 100644
--- a/src/tools/miri/tests/fail/data_race/read_write_race.rs
+++ b/src/tools/miri/tests/fail/data_race/read_write_race.rs
@@ -19,7 +19,7 @@ pub fn main() {
         });
 
         let j2 = spawn(move || {
-            *c.0 = 64; //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>`
+            *c.0 = 64; //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>`
         });
 
         j1.join().unwrap();
diff --git a/src/tools/miri/tests/fail/data_race/read_write_race.stderr b/src/tools/miri/tests/fail/data_race/read_write_race.stderr
index 0c0d2fa32c3..13bc5c74ae3 100644
--- a/src/tools/miri/tests/fail/data_race/read_write_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/read_write_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/read_write_race.rs:LL:CC
    |
 LL |             *c.0 = 64;
-   |             ^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/read_write_race.rs:LL:CC
    |
 LL |             let _val = *c.0;
diff --git a/src/tools/miri/tests/fail/data_race/read_write_race_stack.rs b/src/tools/miri/tests/fail/data_race/read_write_race_stack.rs
index acbe2a09e97..b4e371f430d 100644
--- a/src/tools/miri/tests/fail/data_race/read_write_race_stack.rs
+++ b/src/tools/miri/tests/fail/data_race/read_write_race_stack.rs
@@ -42,7 +42,7 @@ pub fn main() {
 
             sleep(Duration::from_millis(200));
 
-            stack_var //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>`
+            stack_var //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>`
         });
 
         let j2 = spawn(move || {
diff --git a/src/tools/miri/tests/fail/data_race/read_write_race_stack.stderr b/src/tools/miri/tests/fail/data_race/read_write_race_stack.stderr
index e1d0a52d42a..96fcb494822 100644
--- a/src/tools/miri/tests/fail/data_race/read_write_race_stack.stderr
+++ b/src/tools/miri/tests/fail/data_race/read_write_race_stack.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/read_write_race_stack.rs:LL:CC
    |
 LL |             stack_var
-   |             ^^^^^^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/read_write_race_stack.rs:LL:CC
    |
 LL |             *pointer.load(Ordering::Acquire) = 3;
diff --git a/src/tools/miri/tests/fail/data_race/relax_acquire_race.rs b/src/tools/miri/tests/fail/data_race/relax_acquire_race.rs
index cc49e8a04f2..b7226fa626f 100644
--- a/src/tools/miri/tests/fail/data_race/relax_acquire_race.rs
+++ b/src/tools/miri/tests/fail/data_race/relax_acquire_race.rs
@@ -37,7 +37,7 @@ pub fn main() {
 
         let j3 = spawn(move || {
             if SYNC.load(Ordering::Acquire) == 2 {
-                *c.0 //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>`
+                *c.0 //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>`
             } else {
                 0
             }
diff --git a/src/tools/miri/tests/fail/data_race/relax_acquire_race.stderr b/src/tools/miri/tests/fail/data_race/relax_acquire_race.stderr
index fdf0e4917df..92755f5551d 100644
--- a/src/tools/miri/tests/fail/data_race/relax_acquire_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/relax_acquire_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/relax_acquire_race.rs:LL:CC
    |
 LL |                 *c.0
-   |                 ^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |                 ^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/relax_acquire_race.rs:LL:CC
    |
 LL |             *c.0 = 1;
diff --git a/src/tools/miri/tests/fail/data_race/release_seq_race.rs b/src/tools/miri/tests/fail/data_race/release_seq_race.rs
index ba917cd0dd4..dff33a42a1c 100644
--- a/src/tools/miri/tests/fail/data_race/release_seq_race.rs
+++ b/src/tools/miri/tests/fail/data_race/release_seq_race.rs
@@ -41,7 +41,7 @@ pub fn main() {
         let j3 = spawn(move || {
             sleep(Duration::from_millis(500));
             if SYNC.load(Ordering::Acquire) == 3 {
-                *c.0 //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>`
+                *c.0 //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>`
             } else {
                 0
             }
diff --git a/src/tools/miri/tests/fail/data_race/release_seq_race.stderr b/src/tools/miri/tests/fail/data_race/release_seq_race.stderr
index 234ce48e76a..880268730db 100644
--- a/src/tools/miri/tests/fail/data_race/release_seq_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/release_seq_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/release_seq_race.rs:LL:CC
    |
 LL |                 *c.0
-   |                 ^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |                 ^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/release_seq_race.rs:LL:CC
    |
 LL |             *c.0 = 1;
diff --git a/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.rs b/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.rs
index c34f4ebe424..f7a523841b8 100644
--- a/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.rs
+++ b/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.rs
@@ -37,7 +37,7 @@ pub fn main() {
 
         let j2 = spawn(move || {
             if SYNC.load(Ordering::Acquire) == 2 {
-                *c.0 //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>`
+                *c.0 //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>`
             } else {
                 0
             }
diff --git a/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.stderr b/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.stderr
index 8e95d3593b0..386c012ba4e 100644
--- a/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.stderr
+++ b/src/tools/miri/tests/fail/data_race/release_seq_race_same_thread.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/release_seq_race_same_thread.rs:LL:CC
    |
 LL |                 *c.0
-   |                 ^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |                 ^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/release_seq_race_same_thread.rs:LL:CC
    |
 LL |             *c.0 = 1;
diff --git a/src/tools/miri/tests/fail/data_race/rmw_race.rs b/src/tools/miri/tests/fail/data_race/rmw_race.rs
index f96ebef284a..2201362b167 100644
--- a/src/tools/miri/tests/fail/data_race/rmw_race.rs
+++ b/src/tools/miri/tests/fail/data_race/rmw_race.rs
@@ -38,7 +38,7 @@ pub fn main() {
 
         let j3 = spawn(move || {
             if SYNC.load(Ordering::Acquire) == 3 {
-                *c.0 //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>`
+                *c.0 //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>`
             } else {
                 0
             }
diff --git a/src/tools/miri/tests/fail/data_race/rmw_race.stderr b/src/tools/miri/tests/fail/data_race/rmw_race.stderr
index 6252cd5a71f..82cb2c4ecbb 100644
--- a/src/tools/miri/tests/fail/data_race/rmw_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/rmw_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/rmw_race.rs:LL:CC
    |
 LL |                 *c.0
-   |                 ^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |                 ^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/rmw_race.rs:LL:CC
    |
 LL |             *c.0 = 1;
diff --git a/src/tools/miri/tests/fail/data_race/stack_pop_race.rs b/src/tools/miri/tests/fail/data_race/stack_pop_race.rs
index fb3ec5a22bd..dec5ff274cc 100644
--- a/src/tools/miri/tests/fail/data_race/stack_pop_race.rs
+++ b/src/tools/miri/tests/fail/data_race/stack_pop_race.rs
@@ -21,4 +21,4 @@ fn race(local: i32) {
     // Deallocating the local (when `main` returns)
     // races with the read in the other thread.
     // Make sure the error points at this function's end, not just the call site.
-} //~ERROR: Data race detected between (1) Deallocate on thread `main` and (2) Read on thread `<unnamed>`
+} //~ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `main`
diff --git a/src/tools/miri/tests/fail/data_race/stack_pop_race.stderr b/src/tools/miri/tests/fail/data_race/stack_pop_race.stderr
index 6cb0270b3da..71e38c2727e 100644
--- a/src/tools/miri/tests/fail/data_race/stack_pop_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/stack_pop_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Deallocate on thread `main` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `main` at ALLOC. (2) just happened here
   --> $DIR/stack_pop_race.rs:LL:CC
    |
 LL | }
-   |  ^ Data race detected between (1) Deallocate on thread `main` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+   |  ^ Data race detected between (1) Read on thread `<unnamed>` and (2) Deallocate on thread `main` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/stack_pop_race.rs:LL:CC
    |
 LL |         let _val = unsafe { *ptr.0 };
diff --git a/src/tools/miri/tests/fail/data_race/write_write_race.stderr b/src/tools/miri/tests/fail/data_race/write_write_race.stderr
index e9055932c55..3b7eb2b8000 100644
--- a/src/tools/miri/tests/fail/data_race/write_write_race.stderr
+++ b/src/tools/miri/tests/fail/data_race/write_write_race.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/write_write_race.rs:LL:CC
    |
 LL |             *c.0 = 64;
-   |             ^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/write_write_race.rs:LL:CC
    |
 LL |             *c.0 = 32;
diff --git a/src/tools/miri/tests/fail/data_race/write_write_race_stack.stderr b/src/tools/miri/tests/fail/data_race/write_write_race_stack.stderr
index d156ece4a1e..c501ecd11a6 100644
--- a/src/tools/miri/tests/fail/data_race/write_write_race_stack.stderr
+++ b/src/tools/miri/tests/fail/data_race/write_write_race_stack.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/write_write_race_stack.rs:LL:CC
    |
 LL |             stack_var = 1usize;
-   |             ^^^^^^^^^^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |             ^^^^^^^^^^^^^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/write_write_race_stack.rs:LL:CC
    |
 LL |             *pointer.load(Ordering::Acquire) = 3;
diff --git a/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_read.rs b/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_read.rs
index 8c97a31c327..a63cd03366f 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_read.rs
+++ b/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_read.rs
@@ -15,7 +15,7 @@ fn thread_1(p: SendPtr) {
 fn thread_2(p: SendPtr) {
     let p = p.0;
     unsafe {
-        *p = 5; //~ ERROR: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>`
+        *p = 5; //~ ERROR: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>`
     }
 }
 
diff --git a/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_read.stderr b/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_read.stderr
index 26607e1a690..c53a495b5e1 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_read.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_read.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/retag_data_race_read.rs:LL:CC
    |
 LL |         *p = 5;
-   |         ^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Read on thread `<unnamed>` at ALLOC. (1) just happened here
+   |         ^^^^^^ Data race detected between (1) Read on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/retag_data_race_read.rs:LL:CC
    |
 LL |         let _r = &*p;
diff --git a/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_write.stderr b/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_write.stderr
index 33839d2647d..da5af600675 100644
--- a/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_write.stderr
+++ b/src/tools/miri/tests/fail/stacked_borrows/retag_data_race_write.stderr
@@ -1,10 +1,10 @@
-error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+error: Undefined Behavior: Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
   --> $DIR/retag_data_race_write.rs:LL:CC
    |
 LL |         *p = 5;
-   |         ^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (1) just happened here
+   |         ^^^^^^ Data race detected between (1) Write on thread `<unnamed>` and (2) Write on thread `<unnamed>` at ALLOC. (2) just happened here
    |
-help: and (2) occurred earlier here
+help: and (1) occurred earlier here
   --> $DIR/retag_data_race_write.rs:LL:CC
    |
 LL |         let _r = &mut *p;