coreclr is crashing with a segfault.

[matthid]

Sorry I couldn't reproduce this on a smaller sample. It seems to have to do with this specific kind of assembly loading, Repro:

1. Open git bash on windows 10 - 64 bit

2. git clone git@github.com:matthid/FAKE.git

3. cd FAKE

4. git checkout 5e4d92144e8de9a65c9ed4a4c5640b3685ad7724

5. ./build.sh -- wait and get a cup of coffee, if it fails with "The supplied buffer is not valid", try again until

   ---------------------------------------------------------------------
   Build Time Report
   ---------------------------------------------------------------------
   Target                        Duration
   ------                        --------
   Clean                         00:00:00.2523238
   RenameFSharpCompilerService   00:00:04.0286622
   SetAssemblyInfo               00:00:00.0516120
   BuildSolution                 00:00:26.5901468
   InstallDotnetCore             00:00:01.8710067
   DotnetRestore                 00:00:20.5580274
   DotnetBuild                   00:04:41.9870980
   Total:                        00:10:16.6322207
   Status:                       Failure
   ---------------------------------------------------------------------
   1) Fake.UnitTestCommon+FailedTestsException: NUnit test failed (2).
   at Fake.Testing.NUnit3.NUnit3(FSharpFunc`2 setParams, IEnumerable`1 assemblies) in C:\code\fake\src\app\FakeLib\UnitTest\NUnit\NUnit3.fs:line 298
   at FSI_0005.Build.clo@170-13.Invoke(Unit _arg8)
   at Fake.TargetHelper.runSingleTarget(TargetTemplate`1 target) in C:\code\fake\src\app\FakeLib\TargetHelper.fs:line 492
   ---------------------------------------------------------------------
   

6. Now the error can be reproduced with

   1. cd integrationtests/scenarios/dotnetcore-reference-fake-core-targets/temp

      Note: If temp is missing just copy the before folder...

   2. ../../../../nuget/dotnetcore/Fake.netcore/current/Fake.netcore.exe run reference_fake-targets.fsx

I'm trying to use the AssemblyResolve event to resolve assemblies at runtime and it seems like coreclr doesn't like that, see fsprojects/FAKE#1281 (comment) for a screenshot.

I tried to debug this and got a native stacktrace, see fsprojects/FAKE#1281 (comment) . However it is not clear to me if this is a real coreclr bug or a bug in my code. Is there a way to diagnose this further? Adding COREHOST_TRACE=1 doesn't add any additional infos.

When adding --verbose (like ../../../../nuget/dotnetcore/Fake.netcore/current/Fake.netcore.exe --verbose run reference_fake-targets.fsx), you can see that we try to load Fake.Core.Environment.dll immediately before it crashes. Fake.Core.Environment is a dependency of Fake.Core.Targets.dll which loads with the same logic without problems.

Any help is appreciated.

[janvorli]

CoreCLR doesn't work in bash on Windows yet. @jkotas do we know some details on the Windows teams work on the issue?

[jkotas]

This crash looks like duplicate of https://github.com/dotnet/coreclr/issues/5837. I do not think it has anything to do bash on Windows.

[jkotas]

cc @gkhanna79

[matthid]

@janvorli Thanks for the fast answer. Note that I'm not using the "ubuntu bash for windows", but the git bash distributed with Visual Studio 2015.

Running the binaries in cmd fails with the same crash. Trying now if building on cmd generates a working executable. Just for completeness sake I even published and build all packages again manually with cmd and still "dotnet has stopped working".

@jkotas Yes the stack looks the same

[matthid]

Thanks will try to use the suggested workaround

[matthid]

Thank you all again, the workaround is working fine!