Bug 56194 - SIGSEGV on System.Runtime.CompilerServices.RuntimeHelpers.InitializeArray()
Summary: SIGSEGV on System.Runtime.CompilerServices.RuntimeHelpers.InitializeArray()
Alias: None
Product: Runtime
Classification: Mono
Component: JIT (show other bugs)
Version: master
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Rodrigo Kumpera
Depends on:
Reported: 2017-05-10 20:16 UTC by Evgeni
Modified: 2017-11-06 23:02 UTC (History)
5 users (show)

See Also:
Tags: bugpool-archive
Is this bug a regression?: ---
Last known good build:

Memory dump of the error and VS sample project (6.34 KB, application/x-zip-compressed)
2017-05-10 20:16 UTC, Evgeni

Description Evgeni 2017-05-10 20:16:51 UTC
Created attachment 22072 [details]
Memory dump of the error and VS sample project

I'm trying to run the following code on Linux Bash Shell on Windows 10 x64, but it also fails the same way on Ubuntu. 

class Program
        int[] _testArray = { 3, 49, 40, 58, 32 };

        static void Main(string[] args)
            var arr = new int[5];
            var type = Assembly.GetExecutingAssembly().GetTypes().Where(x => x.Name.Contains("<PrivateImplementationDetails>")).Single();
            var fieldInfo = type.GetFields(BindingFlags.NonPublic | BindingFlags.Static).Single();
            RuntimeHelpers.InitializeArray(arr, fieldInfo.FieldHandle);

The code above runs perfectly on Windows .NET and Mono versions for Windows. 

If I make _testArray static the problem goes away.

Mono JIT compiler version 4.8.1 (Stable Wed Apr 12 12:00:40 UTC 2017)

Please find attached memory dump and a sample project for Visual Studio.

Any help is much appreciated!
Comment 1 Bernhard Urban 2017-09-06 15:33:22 UTC
can reproduce on 5.4.0, MacOS (amd64):

> % mono --version
> Mono JIT compiler version (2017-06/28a417c Fri Aug  4 13:27:50 EDT 2017)
> Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
> 	TLS:           normal
> 	SIGSEGV:       altstack
> 	Notification:  kqueue
> 	Architecture:  amd64
> 	Disabled:      none
> 	Misc:          softdebug
> 	LLVM:          yes(3.6.0svn-mono-master/8b1520c)
> 	GC:            sgen (concurrent by default)
Comment 2 Ludovic Henry 2017-10-06 20:36:54 UTC
I can reproduce with Mono (2017-10/a3943e28cf8)
Comment 3 Rodrigo Kumpera 2017-10-09 21:21:24 UTC
PR against master: https://github.com/mono/mono/pull/5746
Comment 4 Rodrigo Kumpera 2017-10-11 17:01:36 UTC
Fixed in master

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