[mono][android-arm64] System.Threading.Volatile.ReadBarrier() never returns (hangs; or StackOverflow/SIGSEGV in deeper call chains)

[uholeschak]

Description

Details:

• net10.0-android36.1, RID android-arm64 (arm64-v8a), Debug, Mono JIT/interpreter (no AOT).
• The [Intrinsic] is not recognized on this target; the self-referential managed
  fallback executes:
  • simple/direct call -> tail-call-optimized into an infinite loop -> HANGS forever
  • deep call chain (e.g. Roslyn CSharpCompilation.Emit) -> stack grows ->
    StackOverflowException / native SIGSEGV (SEGV_ACCERR, fault addr 16 bytes
    below a 4 KB page boundary, e.g. 0x...ff0; observed on Thread-18).
• Output target is irrelevant: MemoryStream vs temp FileStream makes no difference.

Real-world trigger / version boundary:
Microsoft.CodeAnalysis.CSharp 5.3.0 -> OK
Microsoft.CodeAnalysis.CSharp 5.6.0 -> crash (calls ReadBarrier() during Emit)

Ruled out (all reproduce unchanged):
concurrentBuild:false; 16 MB thread stack; CreateFromStream; DOTNET_EnableHWIntrinsic=0;
all ~80 reference assemblies validated intact via PEReader.

Reproduction Steps

Simply execute in net10.0-android36.1:
Minimal repro (no Roslyn, no stream):
System.Threading.Volatile.ReadBarrier(); // never returns
ReadBarrier() hangs and finally generates a stack overflow

Expected behavior

System.Threading.Volatile.ReadBarrier();
should not crash.

Actual behavior

ReadBarrier() hangs and finally generates a stack overflow

Regression?

The problem occurs in combination with Microsoft.CodeAnalysis.CSharp.Scripting 5.6.0, because only this version uses ReadBarrier().
With Microsoft.CodeAnalysis.CSharp.Scripting 5.3.0 there is no problem.

Known Workarounds

Use Microsoft.CodeAnalysis.CSharp.Scripting 5.3.0 to avoid calling ReadBarrier().
Do not use Microsoft.CodeAnalysis.CSharp.Scripting 5.6.0 in net10.0-android36.1

Configuration

.NET SDK: 10.0.301

Android workload:
Workloadversion: 10.0.301.1

Installierte Workload-ID Manifestversion Installationsquelle

android 36.1.69/10.0.100 SDK 10.0.300, VS 18.7.11925.98
ios 26.5.10284/10.0.100 SDK 10.0.300, VS 18.7.11925.98
maccatalyst 26.5.10284/10.0.100 SDK 10.0.300, VS 18.7.11925.98
maui-windows 10.0.20/10.0.100 SDK 10.0.300, VS 18.7.11925.98

Other information

No response