AccessViolationException in .NET Core 3.0 Preview 4

[Kaliumhexacyanoferrat]

I'm using scriban in one of my projects. When switching to .NET Core 3.0 Preview 4, unit tests started to crash in release mode with an ExecutionEngineException (see scriban/scriban#163). I narrowed this down to the following, minimal code example which will run fine in debug mode, but throw an AccessViolationException in release mode (on both linux-x64 and win10-x64):

using System;

namespace ConsoleApp1
{
    class Program
    {

        static void Main(string[] args)
        {
            var options = LexerOptions.Default;
        }

    }

    public struct LexerOptions
    {

        public static readonly LexerOptions Default = new LexerOptions()
        {

        };

    }

}

Sample project: coreclr-24114.zip

Environment

.NET Core SDK (reflecting any global.json):
Version: 3.0.100-preview4-011223
Commit: 118dd862c8

Runtime Environment:
OS Name: Windows
OS Version: 10.0.17763
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\3.0.100-preview4-011223\

Host (useful for support):
Version: 3.0.0-preview4-27615-11
Commit: ee54d4cbd2

.NET Core SDKs installed:
2.1.700-preview-009597 [C:\Program Files\dotnet\sdk]
3.0.100-preview4-011223 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.All 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.0.0-preview4-19216-03 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.0.0-preview4-27615-11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.0.0-preview4-27613-28 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

[EgorBo]

3.0.100-preview4-010961 (3.0.0-preview4-27525-01): doesn't reproduce.
3.0.100-preview5-011468 (3.0.0-preview5-27618-16): reproduces.

[jkotas]

Crash in the JIT:

(45d4.4840): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
clrjit!GenTreeStmt::getNextStmt:
00007ffc`26ce634c 488b4120        mov     rax,qword ptr [rcx+20h] ds:00000000`00000020=????????????????
0:000> k
 # Child-SP          RetAddr           Call Site
00 000000ab`d758c918 00007ffc`26c8c897 clrjit!GenTreeStmt::getNextStmt [f:\workspace\_work\1\s\src\jit\gentree.h @ 4906] 
01 000000ab`d758c920 00007ffc`26cdf8b9 clrjit!Compiler::impGetStructAddr+0x87 [f:\workspace\_work\1\s\src\jit\importer.cpp @ 1479] 
02 000000ab`d758c970 00007ffc`26cdb9d8 clrjit!Compiler::impImportBlockCode+0x2dd9 [f:\workspace\_work\1\s\src\jit\importer.cpp @ 12939] 
03 000000ab`d758d590 00007ffc`26cdb863 clrjit!Compiler::impImportBlock+0x108 [f:\workspace\_work\1\s\src\jit\importer.cpp @ 16903] 
04 000000ab`d758d680 00007ffc`26cd9a89 clrjit!Compiler::impImport+0x7e3 [f:\workspace\_work\1\s\src\jit\importer.cpp @ 17974] 
05 (Inline Function) --------`-------- clrjit!Compiler::fgImport+0xf [f:\workspace\_work\1\s\src\jit\flowgraph.cpp @ 6818] 
06 000000ab`d758d6d0 00007ffc`26cd49bf clrjit!Compiler::compCompile+0xb9 [f:\workspace\_work\1\s\src\jit\compiler.cpp @ 4366] 
07 000000ab`d758d820 00007ffc`26cc2ec4 clrjit!Compiler::compCompileHelper+0x39f [f:\workspace\_work\1\s\src\jit\compiler.cpp @ 6015] 
08 000000ab`d758d8d0 00007ffc`26cc41d4 clrjit!Compiler::compCompile+0x414 [f:\workspace\_work\1\s\src\jit\compiler.cpp @ 5360] 
09 000000ab`d758d970 00007ffc`26d0de52 clrjit!jitNativeCode+0x250 [f:\workspace\_work\1\s\src\jit\compiler.cpp @ 6643] 
0a 000000ab`d758db20 00007ffc`1e3cf675 clrjit!CILJit::compileMethod+0x92 [f:\workspace\_work\1\s\src\jit\ee_il_dll.cpp @ 332] 

cc @RussKeldorph @dotnet/jit-contrib

[AlgorithmsAreCool]

@sandreenko did this fix make it into Preview 5?

I seem to be hitting it or something similar in the new release with scriban.

.NET Core SDK (reflecting any global.json):
 Version:   3.0.100-preview5-011568
 Commit:    b487ff10aa

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.17134
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.0.100-preview5-011568\

Host (useful for support):
  Version: 3.0.0-preview5-27626-15
  Commit:  61f30f5a23

[jkotas]

@AlgorithmsAreCool This fix is in preview5. Could you please open a new issue on the crash that you are hitting?

[AlgorithmsAreCool]

Sure, i'll work on a minimal repo