Environment
- Pythonnet version: 3.0.4
- Python version: 3.11.9
- Operating System: Windows 11 Pro
- .NET Runtime: .NET Core 8
Details
When assemblies are dynamically loaded in .NET, PythonNet assembly loading hook can crash with "Attempted to read or write protected memory." I'm still trying to make a repro, but maybe you'll immediately see what's wrong.
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using var importWarning = Runtime.PyObject_GetAttrString(Exceptions.exceptions_module, "ImportWarning"); |
I think that the issue may be that during assembly loading, the AssemblyManager hook runs without a GIL, so it may crash with the error above. I've seen multiple stack traces happening at different times, often in code completely unrelated to PythonNet (there is multithreading, I use PythonEngine.BeginAllowThreads())
This did not happen in version 3.0.3.
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Describe what you were trying to get done.
Run an application normally that has more than one assembly being loaded (e.g. resources)
-
What commands did you run to trigger this issue? If you can provide a
Minimal, Complete, and Verifiable example
this will help us understand the issue.
I will try to provide one, although it's difficult to reproduce reliably
- If there was a crash, please include the traceback here.
Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at Python.Runtime.Runtime.PyObject_GetAttrString(Python.Runtime.BorrowedReference, System.String)
at Python.Runtime.AssemblyManager+<FindAssemblyCandidates>d__15.MoveNext()
at System.Linq.Enumerable.TryGetFirst[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.Collections.Generic.IEnumerable`1<System.__Canon>, Boolean ByRef)
at System.Linq.Enumerable.FirstOrDefault[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.Collections.Generic.IEnumerable`1<System.__Canon>)
at Python.Runtime.AssemblyManager.FindAssembly(System.String)
at Python.Runtime.AssemblyManager.LoadAssemblyPath(System.String)
at Python.Runtime.AssemblyManager.ResolveHandler(System.Object, System.ResolveEventArgs)
at System.Runtime.Loader.AssemblyLoadContext.InvokeResolveEvent(System.ResolveEventHandler, System.Reflection.RuntimeAssembly, System.String)
at System.Reflection.RuntimeAssembly.InternalLoad(System.Reflection.AssemblyName, System.Threading.StackCrawlMark ByRef, System.Runtime.Loader.AssemblyLoadContext, System.Reflection.RuntimeAssembly, Boolean)
at ...
Environment
Details
When assemblies are dynamically loaded in .NET, PythonNet assembly loading hook can crash with "Attempted to read or write protected memory." I'm still trying to make a repro, but maybe you'll immediately see what's wrong.
pythonnet/src/runtime/AssemblyManager.cs
Line 206 in de7a1d2
I think that the issue may be that during assembly loading, the AssemblyManager hook runs without a GIL, so it may crash with the error above. I've seen multiple stack traces happening at different times, often in code completely unrelated to PythonNet (there is multithreading, I use PythonEngine.BeginAllowThreads())
This did not happen in version 3.0.3.
Describe what you were trying to get done.
Run an application normally that has more than one assembly being loaded (e.g. resources)
What commands did you run to trigger this issue? If you can provide a
Minimal, Complete, and Verifiable example
this will help us understand the issue.
I will try to provide one, although it's difficult to reproduce reliably