I'm running into the same issue with my processor and another processor. What I'm doing is caching a KSClassDeclaration through multiple rounds and then calling packageName throws this error:

ksp.org.jetbrains.kotlin.analysis.api.lifetime.KtInvalidLifetimeOwnerAccessException: Access to invalid ksp.org.jetbrains.kotlin.analysis.api.lifetime.KtAlwaysAccessibleLifetimeToken@a17dbac: PSI has changed since creation
	at ksp.org.jetbrains.kotlin.analysis.api.fir.utils.ValidityAwareCachedValue.getValue-impl(ValidityAwareCachedValue.kt:33)
	at ksp.org.jetbrains.kotlin.analysis.api.fir.symbols.KtFirNamedClassOrObjectSymbol.getPsi(KtFirNamedClassOrObjectSymbol.kt:36)
	at com.google.devtools.ksp.impl.symbol.kotlin.UtilKt.toContainingFile(util.kt:236)
	at com.google.devtools.ksp.impl.symbol.kotlin.AbstractKSDeclarationImpl$containingFile$2.invoke(AbstractKSDeclarationImpl.kt:77)
	at com.google.devtools.ksp.impl.symbol.kotlin.AbstractKSDeclarationImpl$containingFile$2.invoke(AbstractKSDeclarationImpl.kt:76)
	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
	at com.google.devtools.ksp.impl.symbol.kotlin.AbstractKSDeclarationImpl.getContainingFile(AbstractKSDeclarationImpl.kt:76)
	at com.google.devtools.ksp.impl.symbol.kotlin.AbstractKSDeclarationImpl$packageName$2.invoke(AbstractKSDeclarationImpl.kt:83)
	at com.google.devtools.ksp.impl.symbol.kotlin.AbstractKSDeclarationImpl$packageName$2.invoke(AbstractKSDeclarationImpl.kt:80)
	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
	at com.google.devtools.ksp.impl.symbol.kotlin.AbstractKSDeclarationImpl.getPackageName(AbstractKSDeclarationImpl.kt:80)
	at com.amazon.lastmile.app.platform.inject.processor.MergeComponentProcessor.generateComponentInterface(MergeComponentProcessor.kt:91)

To me this seems to be a regression in KSP 2. I tested with 2.0.0-1.0.22 and ksp.useKSP2=true.

I'm running into this issue with another processor that defers processing of symbols to later rounds and caches these symbols. When it's actually processing the symbols the same exception is thrown:

ksp.org.jetbrains.kotlin.analysis.api.lifetime.KtInvalidLifetimeOwnerAccessException: Access to invalid ksp.org.jetbrains.kotlin.analysis.api.lifetime.KtAlwaysAccessibleLifetimeToken@5bf278a3: PSI has changed since creation
	at ksp.org.jetbrains.kotlin.analysis.api.fir.utils.ValidityAwareCachedValue.getValue-impl(ValidityAwareCachedValue.kt:33)
	at ksp.org.jetbrains.kotlin.analysis.api.fir.types.KtFirClassErrorType.getAnnotationsList(KtFirClassErrorType.kt:50)
	at com.google.devtools.ksp.impl.symbol.kotlin.KSTypeImpl$Companion.getCached(KSTypeImpl.kt:40)
	at com.google.devtools.ksp.impl.symbol.kotlin.KSTypeReferenceImpl.resolve(KSTypeReferenceImpl.kt:68)
	at com.google.devtools.ksp.visitor.KSValidateVisitor.visitTypeReference(KSValidateVisitor.kt:57)
	at com.google.devtools.ksp.visitor.KSValidateVisitor.visitTypeReference(KSValidateVisitor.kt:5)
	at com.google.devtools.ksp.impl.symbol.kotlin.KSTypeReferenceImpl.accept(KSTypeReferenceImpl.kt:82)
	at com.google.devtools.ksp.visitor.KSValidateVisitor.visitClassDeclaration(KSValidateVisitor.kt:64)
	at me.tatarka.inject.compiler.ksp.InjectProcessor$validate$1.visitClassDeclaration(InjectProcessor.kt:107)
	at me.tatarka.inject.compiler.ksp.InjectProcessor$validate$1.visitClassDeclaration(InjectProcessor.kt:87)
	at com.google.devtools.ksp.impl.symbol.kotlin.KSClassDeclarationImpl.accept(KSClassDeclarationImpl.kt:175)
	at me.tatarka.inject.compiler.ksp.InjectProcessor.validate(InjectProcessor.kt:86)
	at me.tatarka.inject.compiler.ksp.InjectProcessor.process(InjectProcessor.kt:53)
	at com.google.devtools.ksp.impl.KotlinSymbolProcessing.execute(KotlinSymbolProcessing.kt:533)
	at com.tschuchort.compiletesting.Ksp2PrecursorTool.execute(Ksp2.kt:112)

The kotlin-inject processor caches the deferred classes here.

~~This happens while running unit tests using https://github.com/ZacSweers/kotlin-compile-testing/releases/tag/0.5.0. This could be related.~~ This happens during normal compilation as well and is not related to the compile testing library.

KSP2: KtInvalidLifetimeOwnerAccessException: Access to invalid KtAlwaysAccessibleLifetimeToken: PSI has changed since creation #1854

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