dd-trace-dotnet: Exit 80131506 after installing Datadog csharp

Describe the bug After installing Datadog c-sharp some of my applications won’t start up, giving exit code 80131506

To Reproduce Steps to reproduce the behavior:

1. Install DataDog tracer from https://github.com/DataDog/dd-trace-csharp/releases
2. Restart IIS using steps on https://docs.datadoghq.com/tracing/setup/dotnet/
3. Load application
4. App Pool crashes before first page is loaded

Expected behavior The application works the same after installing Datadog tracer.

Screenshots None

Runtime environment (please complete the following information):

• Instrumentation mode: automatic with msi installer
• Tracer version: 0.5.0
• OS: Windows Server 2016 Data Center
• CLR: .NET 4.0.30319 (reported in IIS), .NET 4.7 installed on machine

Additional context Event Viewer Logs

Application Error:
Faulting application name: w3wp.exe, version: 10.0.14393.0, time stamp: 0x57899b8a
Faulting module name: clr.dll, version: 4.7.3190.0, time stamp: 0x5b693b48
Exception code: 0xc0000005
Fault offset: 0x000000000056604b
Faulting process id: 0x4d8
Faulting application start time: 0x01d47a9f85863416
Faulting application path: c:\windows\system32\inetsrv\w3wp.exe
Faulting module path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll
Report Id: 769c85ef-ad3c-45f2-9441-e4d4ce2a7381
Faulting package full name: 
Faulting package-relative application ID: 

.NET Runtime:
Application: w3wp.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an internal error in the .NET Runtime at IP 00007FFD0A77604B (00007FFD0A210000) with exit code 80131506.

Attempted to change GC settings, but it didn’t help

• tried <gcServer enabled="true" />
• tried <gcConcurrent enabled="false" />

Oddly this doesn’t happen for all of my .NET applications, some work fine.

• both applications are compiled with .NET 4.5.2

Debugging with sysinternals/procmon showed attempts to write to ProgramData\Datadog .NET Tracer\logs, but ProgramData\Datadog .NET Tracer didn’t exist…?

• After manually creating ProgramData\Datadog .NET Tracer\logs, a dotnet-profiler.log was created, but only had [info] level messages in it

Going to try attaching with Windbg, but I’m a bit out of my depth on this.