Assertion failed 'false' in 'System.DomainNameHelper:IdnEquivalent(System.String):System.String' during 'Early Value Propagation' (IL size 127)

BBF_HAS_IDX_LEN is not set on BB18 but is required because of the following tree
N006 (  5,  4) [000209] ---X--------              *  ARR_LENGTH int
N005 (  3,  2) [000208] ------------              \--*  LCL_VAR   ref    V02 loc1         u:1
C:\git\runtime\src\coreclr\jit\earlyprop.cpp:115
Assertion failed 'false' in 'System.DomainNameHelper:IdnEquivalent(System.String):System.String' during 'Early Value Propagation' (IL size 127)

ngendump.txt

To repro:

build.cmd clr+libs -rc Checked -lc Release

(Does not repro with -rc Debug.)

Then run:

{REPO_ROOT}\artifacts\bin\coreclr\windows.x64.Checked\ilc\ilc.exe @{REPO_ROOT}\artifacts\bin\repro\x64\Checked\compile-with-Release-libs.rsp --parallelism:1 --Ot --codegenopt:NGenDump=IdnEquivalent --singlemethodtypename=System.DomainNameHelper,System.Private.Uri --singlemethodname=IdnEquivalent

It might be convenient to use the Visual Studio solution at {REPO_ROOT}\src\coreclr\tools\aot\ilc.sln: open the solution, set project configuration to x64 Checked, in the Debug menu choose ILCompiler debug properties and set command line arguments to the arguments from the above command line. Make sure to also check Enable native code debugging. Hit F5 to run under debugger.

@EgorBo

@EgorBo you mentioned you might be interested to get your feet wet with NativeAOT - couldn't quickly figure out how to hit this with CoreCLR-JIT so the repro steps involve a small NativeAOT workflow. If it's close to your are of expertise, could you please have a look?

I'm hitting this in #63571.

Sure, feel free to ping me for any nativeaot jit issues! 🙂

Minimal repro:

using System;
using System.Runtime.CompilerServices;

class Prog
{
    [MethodImpl(MethodImplOptions.NoInlining)]
    static int Test(string x)
    {
        try
        {
            return Callee1(x);
        }
        catch
        {
        }
        return 1;
    }

    static int Callee1(string x) => Callee2(x, 0);

    static int Callee2(string x, int index)
    {
        if (x == null)
            throw new Exception();

        return x.Length;
    }

    static unsafe void Main()
    {
        Console.WriteLine(Test("1"));
        Console.ReadKey();
    }
}

will file a fix shortly

Thank you for the quick fix!

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Assertion failed 'false' in 'System.DomainNameHelper:IdnEquivalent(System.String):System.String' during 'Early Value Propagation' (IL size 127) #63610

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Assertion failed 'false' in 'System.DomainNameHelper:IdnEquivalent(System.String):System.String' during 'Early Value Propagation' (IL size 127) #63610

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MichalStrehovsky commented on Jan 11, 2022

EgorBo commented on Jan 11, 2022

EgorBo commented on Jan 11, 2022

MichalStrehovsky commented on Jan 12, 2022

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