StackOverflowError during "Computing additional info" and "Decoration Calculation"

This gets triggered every time when I press ctrl in the Eclipse IDE. The only helpful thing that I can currently provide is the following log:

eclipse.buildId=4.37.0.20250905-1455
java.version=24.0.1
java.vendor=Eclipse Adoptium
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=de_DE
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.java.product

!ENTRY org.eclipse.ui 4 0 2025-09-18 15:53:17.537
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.StackOverflowError
at org.eclipse.jdt.core.Signature.getSimpleNames(Signature.java:2220)
at org.eclipse.jdt.internal.core.util.Util.getTrimmedSimpleNames(Util.java:1353)
at org.eclipse.jdt.internal.core.PackageFragmentRoot.getPackageFragment(PackageFragmentRoot.java:569)
at org.eclipse.jdt.internal.core.NameLookup.seekPackageFragments(NameLookup.java:1244)
at org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:809)
at org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:735)
at org.eclipse.jdt.internal.core.SearchableEnvironment.find(SearchableEnvironment.java:200)
at org.eclipse.jdt.internal.core.SearchableEnvironment.findType(SearchableEnvironment.java:575)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.fromSplitPackageOrOracle(LookupEnvironment.java:472)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.lambda$1(LookupEnvironment.java:345)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForTypeFromModules(LookupEnvironment.java:439)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:344)
at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:274)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findImport(CompilationUnitScope.java:626)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.resolveImports(CompilationUnitScope.java:325)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.checkAndSetImports(CompilationUnitScope.java:284)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment$CompleteTypeBindingsSteps.perform(LookupEnvironment.java:189)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.completeTypeBindings(LookupEnvironment.java:629)
at org.eclipse.jdt.internal.codeassist.impl.Engine.accept(Engine.java:151)
at org.eclipse.jdt.internal.codeassist.SelectionEngine.accept(SelectionEngine.java:313)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:390)
at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:274)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findImport(CompilationUnitScope.java:626)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.resolveImports(CompilationUnitScope.java:325)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.checkAndSetImports(CompilationUnitScope.java:284)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment$CompleteTypeBindingsSteps.perform(LookupEnvironment.java:189)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.completeTypeBindings(LookupEnvironment.java:629)
at org.eclipse.jdt.internal.codeassist.impl.Engine.accept(Engine.java:151)
...

!ENTRY org.eclipse.core.jobs 4 2 2025-09-18 15:55:16.916
!MESSAGE An internal error occurred during: "Computing additional info".
!STACK 0
java.lang.StackOverflowError
at org.eclipse.jdt.core.Signature.getSimpleNames(Signature.java:2220)
at org.eclipse.jdt.internal.core.util.Util.getTrimmedSimpleNames(Util.java:1353)
at org.eclipse.jdt.internal.core.PackageFragmentRoot.getPackageFragment(PackageFragmentRoot.java:569)
at org.eclipse.jdt.internal.core.NameLookup.seekPackageFragments(NameLookup.java:1244)
at org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:809)
at org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:735)
at org.eclipse.jdt.internal.core.SearchableEnvironment.find(SearchableEnvironment.java:200)
at org.eclipse.jdt.internal.core.SearchableEnvironment.findType(SearchableEnvironment.java:575)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.fromSplitPackageOrOracle(LookupEnvironment.java:472)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.lambda$1(LookupEnvironment.java:345)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForTypeFromModules(LookupEnvironment.java:439)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:344)
at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:274)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findImport(CompilationUnitScope.java:626)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.resolveImports(CompilationUnitScope.java:325)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.checkAndSetImports(CompilationUnitScope.java:284)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment$CompleteTypeBindingsSteps.perform(LookupEnvironment.java:189)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.completeTypeBindings(LookupEnvironment.java:629)
at org.eclipse.jdt.internal.core.hierarchy.HierarchyResolver.accept(HierarchyResolver.java:213)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:390)
at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:274)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findImport(CompilationUnitScope.java:626)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.resolveImports(CompilationUnitScope.java:325)
at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.checkAndSetImports(CompilationUnitScope.java:284)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment$CompleteTypeBindingsSteps.perform(LookupEnvironment.java:189)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.completeTypeBindings(LookupEnvironment.java:629)
at org.eclipse.jdt.internal.core.hierarchy.HierarchyResolver.accept(HierarchyResolver.java:213)
...

Reproduce the failure by pressing Ctrl in Eclipse and trace the repeated calls in the stack, starting with LookupEnvironment.askForType, CompilationUnitScope.resolveImports, PackageBinding.getTypeOrPackage, and the code-assist or hierarchy entry points. Inspect the interactions among Signature.getSimpleNames, NameLookup.findType, and HierarchyResolver.accept; done means the reported action no longer ends in a StackOverflowError during additional-info or decoration calculation.

Written by the indexing model from the issue text.