Repository navigation
Test failure: Interop Work Item throws System.IO.FileNotFoundException #134296
Description
Activity
Tagging subscribers to this area: @steveisok, @dotnet/area-system-reflection
See info in area-owners.md if you want to be subscribed.I traced this to a regression introduced by #133202.
TypeMapLib1.dllis present besideTypeMapApp.dllin the Helix payload. The failure occurs becauseAssemblyCheckernow usesMetadataLoadContextwith a resolver that searches only the runtime directory, not the directory containing the inspected assembly. Resolving the TypeMap custom attributes therefore throwsFileNotFoundException. This exact side-by-side dependency risk was identified during the review of #133202.The exception does not directly fail the test wrapper. Instead, every abort generates a large crash dump. Repeated invocations produce several gigabytes of dumps, eventually exhausting the worker's disk and preventing IL round-trip files and test results from being written. This also explains why some runs appear green despite containing the same exceptions and dump storm: those machines had enough free disk space.
The fix should create a resolver for each inspected assembly that probes the assembly's directory before the runtime directory. A regression test should cover an assembly-level attribute whose type or generic argument is defined in an adjacent DLL.
Note
This analysis was generated with GitHub Copilot.
Failed in: runtime-coreclr ilasm 20260926.1
Failed tests:
coreclr osx arm64 Checked ilasmroundtrip @ OSX.26.Arm64.Open - Interop Work Item coreclr osx x64 Checked ilasmroundtrip @ OSX.15.Amd64.Open - Interop/TypeMap/TypeMapApp/TypeMapApp.cmdError message:
Unhandled exception. System.IO.FileNotFoundException: Could not find assembly 'TypeMapLib1, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'. Either explicitly load this assembly using a method such as LoadFromAssemblyPath() or use a MetadataAssemblyResolver that returns a valid assembly. at System.Reflection.TypeLoading.Ecma.EcmaResolver.ResolveAssembly(AssemblyReferenceHandle handle, EcmaModule module) in /_/src/libraries/System.Reflection.MetadataLoadContext/src/System/Reflection/TypeLoading/General/Ecma/EcmaResolver.cs:line 150 at System.Reflection.TypeLoading.Ecma.EcmaResolver.ComputeTypeRefResolution(TypeReferenceHandle handle, EcmaModule module) in /_/src/libraries/System.Reflection.MetadataLoadContext/src/System/Reflection/TypeLoading/General/Ecma/EcmaResolver.cs:line 77 at System.Reflection.TypeLoading.Ecma.EcmaModule.GetTypeFromReference(MetadataReader reader, TypeReferenceHandle handle, Byte rawTypeKind) in /_/src/libraries/System.Reflection.MetadataLoadContext/src/System/Reflection/TypeLoading/Modules/Ecma/EcmaModule.TypeProvider.cs:line 20 at System.Reflection.Metadata.Ecma335.SignatureDecoder`2.DecodeType(BlobReader& blobReader, Boolean allowTypeSpecifications, Int32 typeCode) in /_/src/libraries/System.Reflection.Metadata/src/System/Reflection/Metadata/Ecma335/SignatureDecoder.cs:line 127 at System.Reflection.Metadata.Ecma335.SignatureDecoder`2.DecodeTypeSequence(BlobReader& blobReader) in /_/src/libraries/System.Reflection.Metadata/src/System/Reflection/Metadata/Ecma335/SignatureDecoder.cs:line 152 at System.Reflection.Metadata.Ecma335.SignatureDecoder`2.DecodeType(BlobReader& blobReader, Boolean allowTypeSpecifications, Int32 typeCode) in /_/src/libraries/System.Reflection.Metadata/src/System/Reflection/Metadata/Ecma335/SignatureDecoder.cs:line 115 at System.Reflection.TypeLoading.Ecma.EcmaResolver.ResolveTypeDefRefOrSpec(EntityHandle handle, EcmaModule module, TypeContext& typeContext) in /_/src/libraries/System.Reflection.MetadataLoadContext/src/System/Reflection/TypeLoading/General/Ecma/EcmaResolver.cs:line 19 at System.Reflection.TypeLoading.Ecma.EcmaCustomAttributeData.ComputeAttributeType() in /_/src/libraries/System.Reflection.MetadataLoadContext/src/System/Reflection/TypeLoading/CustomAttributes/Ecma/EcmaCustomAttributeData.cs:line 54 at System.Reflection.TypeLoading.RoCustomAttributeData.get_AttributeType() in /_/src/libraries/System.Reflection.MetadataLoadContext/src/System/Reflection/TypeLoading/CustomAttributes/RoCustomAttributeData.cs:line 15 at AssemblyChecker.AssemblyInspector.IsDebug(String path) in /_/src/coreclr/tools/AssemblyChecker/AssemblyInspector.cs:line 20 at AssemblyChecker.Program.Main(String[] args) in /_/src/coreclr/tools/AssemblyChecker/Program.cs:line 84 [createdump] Gathering state for process 38288 [createdump] Crashing thread be8aa signal 6 (0006) [createdump] Writing crash report to file /cores/coredump.38288.dmp.crashreport.json [createdump] Crash report successfully written [createdump] Writing minidump with heap to file /cores/coredump.38288.dmp [createdump] Written 311054456 bytes (18985 pages) to core file [createdump] Target process is alive [createdump] Dump successfully written in 868ms waitpid() returned successfully (wstatus 00000000) WEXITSTATUS 0 WTERMSIG 0- added a commit that references this issue
on Sep 29, 2026
Build Information
Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594299
Build error leg or test failing: Interop Work Item
Error Detail:
Error Message
Fill the error message using step by step known issues guidance.
{ "ErrorMessage": "Failed test: Interop Work Item", "BuildRetry": false, "ExcludeConsoleLog": false }Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1594299
Error message validated:
[Failed test: Interop Work Item]Result validation: ❌ Known issue did not match with the provided build.
Validation performed at: 9/20/2026 2:23:57 AM UTC
Report
Summary