Crash on windows_x64 with dart sdk 2.19.0-444.6.beta

[6f]

We have a program that crashes on windows x64 with the latest dart beta version. The crash is likely related to the usage of typed_data.

It does not crash using the latest stable dart version.

Dart Version (installed using flutter upgrade)

> dart --version
Dart SDK version: 2.19.0-444.6.beta (beta) (Fri Jan 20 12:27:02 2023 +0000) on "windows_x64"

This is currently the smallest example I have which crashes.

import 'dart:math';
import 'dart:typed_data';

// COPIED FROM THE vector_math PACKAGE
// INCLUDED HERE TO MAKE ANALYSIS EASIER
// import 'package:vector_math/vector_math.dart';
class Vector2 {
  final Float32List _v2storage;
  
  factory Vector2(double x, double y) => Vector2.zero()..setValues(x, y);
  
  Vector2.zero() : _v2storage = Float32List(2);
  
  void setValues(double x, double y) {
    _v2storage[0] = x;
    _v2storage[1] = y;
  }
  
  double dot(Vector2 other) {
    final otherStorage = other._v2storage;
    double sum;
    sum = _v2storage[0] * otherStorage[0];
    sum += _v2storage[1] * otherStorage[1];
    return sum;
  }
  
  double get length => sqrt(length2);
  
  double get length2 {
    double sum;
    sum = _v2storage[0] * _v2storage[0];
    sum += _v2storage[1] * _v2storage[1];
    return sum;
  }
  
  double normalize() {
    final l = length;
    if (l == 0.0) {
      return 0.0;
    }
    final d = 1.0 / l;
    _v2storage[0] *= d;
    _v2storage[1] *= d;
    return l;
  }
}

void main() {
  print("START main()");
  var rng = Random(0);
  
  var sum = 0.0;
  for (var i = 0; i < 10000; ++i) {
    if (i % 100 == 0) print("$i");
    var theta1 = rng.nextDouble() * pi * 2.0;
    var theta2 = rng.nextDouble() * pi * 2.0;

    var a = Vector2(sin(theta1), cos(theta1));
    var b = Vector2(sin(theta2), cos(theta2));

    a.normalize();

    sum += a.dot(b);
  }

  print("sum: $sum");
}

The following output is visible in console. Crash always happens between iteration 3700 and 3800. No error information is printed.

> dart run
Building package executable...
Built crashtest:crashtest.
START main()
0
100
< some lines omitted >
3600
3700

Crash details are visible in windows event log:

Faulting application name: dart.exe, version: 0.0.0.0, time stamp: 0x63ca924c
Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000
Exception code: 0x80000003
Fault offset: 0x0000027a701bd51c
Faulting process id: 0x2a28
Faulting application start time: 0x01d93dfccce3c90e
Faulting application path: D:\flutter\bin\cache\dart-sdk\bin\dart.exe
Faulting module path: unknown
Report Id: 6860e180-d5af-490f-9583-78974a1a7418
Faulting package full name: 
Faulting package-relative application ID: 

[asashour]

Would you mind testing it with the dev channel (3.0.0-218.0.dev)? I couldn't reproduce it by:

dart compile exe .\lib\a.dart
.\lib\a.exe

[mraleph]

Duplicate of #50622

[6f]

For completeness sake:
I cannot reproduce it on the dev channel (3.0.0-218.0.dev). It looks like it has indeed been fixed. Thank you your time and quick response.