RuntimeExceptionWithAttachments: Read access is allowed from inside read-action only

[esafak]

This occurred while trying to run the test suite after upgrading to 6.0.2:

com.intellij.openapi.diagnostic.RuntimeExceptionWithAttachments: Read access is allowed from inside read-action only (see Application.runReadAction()); If you access or modify model on EDT consider wrapping your code in WriteIntentReadAction  or ReadAction; see https://jb.gg/ij-platform-threading for details
Current thread: Thread[#2518,ApplicationImpl pooled thread 364,4,main] 222446226 (EventQueue.isDispatchThread()=false)
SystemEventQueueThread: Thread[#61,AWT-EventQueue-0,6,main] 1709404488
	at com.intellij.util.concurrency.ThreadingAssertions.createThreadAccessException(ThreadingAssertions.java:257)
	at com.intellij.util.concurrency.ThreadingAssertions.softAssertReadAccess(ThreadingAssertions.java:173)
	at com.intellij.openapi.application.impl.ApplicationImpl.assertReadAccessAllowed(ApplicationImpl.java:1171)
	at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:824)
	at com.intellij.psi.stubs.StubIndexEx.getContainingIds(StubIndexEx.java:361)
	at com.intellij.psi.stubs.StubIndexEx.processElements(StubIndexEx.java:177)
	at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:101)
	at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:90)
	at com.intellij.psi.impl.java.stubs.index.JavaFullClassNameIndex.getClasses(JavaFullClassNameIndex.java:37)
	at com.intellij.psi.impl.file.impl.JavaFileManagerImpl.doFindClasses(JavaFileManagerImpl.java:98)
	at com.intellij.psi.impl.file.impl.JavaFileManagerImpl.findClass(JavaFileManagerImpl.java:121)
	at com.intellij.psi.impl.PsiElementFinderImpl.findClass(PsiElementFinderImpl.java:42)
	at com.intellij.psi.impl.JavaPsiFacadeImpl.doFindClass(JavaPsiFacadeImpl.java:110)
	at com.intellij.psi.impl.JavaPsiFacadeImpl.findClass(JavaPsiFacadeImpl.java:88)
	at io.kotest.plugin.intellij.run.MainKt.is421(main.kt:44)
	at io.kotest.plugin.intellij.run.MainKt.determineKotestLauncher(main.kt:62)
	at io.kotest.plugin.intellij.run.KotestRunnableState.createJavaParameters(KotestRunnableState.kt:29)
	at com.intellij.execution.configurations.JavaCommandLineState.getJavaParameters(JavaCommandLineState.java:45)
	at com.intellij.execution.impl.DefaultJavaProgramRunner.patchJavaCommandLineParams(DefaultJavaProgramRunner.java:130)
	at com.intellij.execution.impl.DefaultJavaProgramRunner.lambda$doExecuteAsync$5(DefaultJavaProgramRunner.java:155)
	at com.intellij.execution.target.TargetEnvironmentAwareRunProfileState$1.run(TargetEnvironmentAwareRunProfileState.java:58)
	at com.intellij.openapi.progress.impl.CoreProgressManager.startTask(CoreProgressManager.java:498)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.startTask(ProgressManagerImpl.java:119)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcessWithProgressAsynchronously$7(CoreProgressManager.java:549)
	at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$4(ProgressRunner.java:252)
	at com.intellij.openapi.progress.ProgressManager.lambda$runProcess$0(ProgressManager.java:98)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:229)
	at com.intellij.platform.diagnostic.telemetry.helpers.TraceKt.use(trace.kt:44)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:228)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$14(CoreProgressManager.java:681)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:756)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:712)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:680)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:78)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:209)
	at com.intellij.openapi.progress.ProgressManager.runProcess(ProgressManager.java:98)
	at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$5(ProgressRunner.java:252)
	at com.intellij.openapi.progress.impl.ProgressRunner$ProgressRunnable.run(ProgressRunner.java:515)
	at com.intellij.openapi.progress.impl.ProgressRunner.lambda$launchTask$18(ProgressRunner.java:480)
	at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:167)
	at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:167)
	at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:173)
	at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:167)
	at com.intellij.openapi.progress.impl.ProgressRunner.lambda$launchTask$19(ProgressRunner.java:476)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:735)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:732)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:732)
	at java.base/java.lang.Thread.run(Thread.java:1583)

Plugin version 6.0.101-2025.2