JIT: Unchecked write barriers are emitted for stack allocated arrays #112709
Description
// Generated by Fuzzlyn v2.4 on 2025-02-19 20:47:50
// Run on X64 Windows
// Seed: 12432040051036532696-vectort,vector128,vector256,x86aes,x86avx,x86avx2,x86avx512bw,x86avx512bwvl,x86avx512cd,x86avx512cdvl,x86avx512dq,x86avx512dqvl,x86avx512f,x86avx512fvl,x86avx512fx64,x86bmi1,x86bmi1x64,x86bmi2,x86bmi2x64,x86fma,x86lzcnt,x86lzcntx64,x86pclmulqdq,x86popcnt,x86popcntx64,x86sse,x86ssex64,x86sse2,x86sse2x64,x86sse3,x86sse41,x86sse41x64,x86sse42,x86sse42x64,x86ssse3,x86x86base
// Reduced from 62.0 KiB to 0.5 KiB in 00:06:15
// Exits with error:
// Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
// at Program.Main(Fuzzlyn.ExecutionServer.IRuntime)
// at Fuzzlyn.ExecutionServer.Program.<RunPairAsync>g__RunAndGetResultAsync|1_0(Byte[], <>c__DisplayClass1_0 ByRef)
// at Fuzzlyn.ExecutionServer.Program.RunPairAsync(System.Runtime.Loader.AssemblyLoadContext, Fuzzlyn.ExecutionServer.ProgramPair)
// at Fuzzlyn.ExecutionServer.Program+<>c__DisplayClass0_0.<Main>b__0()
// at System.Threading.Thread+StartHelper.RunWorker()
//
using System;
using System.Numerics;
using System.Runtime.Intrinsics;
using System.Runtime.Intrinsics.X86;
public class Program
{
public static void Main()
{
Vector256<byte>[][][] vr0 = default(Vector256<byte>[][][]);
vr0 = new Vector256<byte>[][][]
{
new Vector256<byte>[][]
{
new Vector256<byte>[]
{
Vector256.Create<byte>(0)
}
}
};
vr0[0] = vr0[0];
}
}Looks introduced by #112527, cc @AndyAyersMS