Calling AssemblyLoadContext.Unload multiple times causes fatal crash #91087
Description
Description
Unfortunately I cant provide repro case (yet). But at least it is reproducible every time I try certain scenario in my app.
I am getting this exception in WPF .NET 7 app. It happens when I try to unload a dll loaded in run-time.. The unload works if called correctly.
But if it tries to call apploadingContext.Unload second time (there is a bug somewhere in my code) - the exception ExecutionEngineException is shown in VS if I debug and if I run it standalone I get this error in event log:
Faulting application name: qqq.exe, version: 0.4.0.1, time stamp: 0x64b07659
Faulting module name: coreclr.dll, version: 7.0.1023.36312, time stamp: 0x64b06d6c
Exception code: 0xc0000005
Fault offset: 0x0000000000133fa2
Faulting process ID: 0xaea4
Faulting application start time: 0x01d9d69df3fe6c1e
Faulting application path: qqqq\bin\Debug\net7.0-windows\qqq.exe
Faulting module path: C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.10\coreclr.dll
Report ID: 9616639b-d2b2-4669-95da-65f25f23f4e7
Faulting package full name:
Faulting package-relative application ID:
Reproduction Steps
N/A
Expected behavior
Since this exception marked as obsolete I think it should not be thrown. Perhaps new design should react on fatal conditions somehow differently.. Having said that I want to point that dll I am loading is few lines C# compiled in run-time with Roslyn and it does not do any funny stuff like unmanaged memory access, so I suspect that this exception is a side-effect from a bug in AssemblyContextLoader..
Actual behavior
Application crashes and no way to recover from it.
Regression?
N/A
Known Workarounds
None
Configuration
.NET 7.0 on Windows 10 x64 build 19045
Other information
the code for the loader is taken from MSDN code:
public class MyAssemblyLoader : AssemblyLoadContext//, IDisposable
{
private AssemblyDependencyResolver resolver;
public MyAssemblyLoader (string pluginPath) : base(pluginPath, true)
{
resolver = new AssemblyDependencyResolver(pluginPath);
}
protected override Assembly Load(AssemblyName assemblyName)
{
string assemblyPath = resolver.ResolveAssemblyToPath(assemblyName);
if (assemblyPath != null)
{
return LoadFromAssemblyPath(assemblyPath);
}
return null;
}
protected override IntPtr LoadUnmanagedDll(string unmanagedDllName)
{
string libraryPath = resolver.ResolveUnmanagedDllToPath(unmanagedDllName);
if (libraryPath != null)
{
return LoadUnmanagedDllFromPath(libraryPath);
}
return IntPtr.Zero;
}
}