diff --git a/platform/polySymbols/src/com/intellij/polySymbols/context/PolyContext.kt b/platform/polySymbols/src/com/intellij/polySymbols/context/PolyContext.kt
index 38eef11aaaf1..a04cefa5d0d8 100644
--- a/platform/polySymbols/src/com/intellij/polySymbols/context/PolyContext.kt
+++ b/platform/polySymbols/src/com/intellij/polySymbols/context/PolyContext.kt
@@ -11,6 +11,7 @@ import com.intellij.polySymbols.context.impl.PolyContextImpl
 import com.intellij.polySymbols.context.impl.PolyContextProviderExtensionCollector
 import com.intellij.polySymbols.context.impl.findPolyContext
 import com.intellij.psi.PsiElement
+import com.intellij.util.concurrency.annotations.RequiresReadLock
 import org.jetbrains.annotations.TestOnly
 
 interface PolyContext {
@@ -41,10 +42,12 @@ interface PolyContext {
     val PKG_MANAGER_SYMFONY_BUNDLES: String = "symfony-bundles"
 
     @JvmStatic
+    @RequiresReadLock
     fun get(kind: PolyContextKind, location: VirtualFile, project: Project): PolyContextName? =
       findPolyContext(kind, location, project)
 
     @JvmStatic
+    @RequiresReadLock
     fun get(kind: PolyContextKind, location: PsiElement): PolyContextName? =
       findPolyContext(kind, location)
 
diff --git a/platform/polySymbols/src/com/intellij/polySymbols/context/impl/PolyContextDiscovery.kt b/platform/polySymbols/src/com/intellij/polySymbols/context/impl/PolyContextDiscovery.kt
index 48dbb5a2b48c..501907b17b24 100644
--- a/platform/polySymbols/src/com/intellij/polySymbols/context/impl/PolyContextDiscovery.kt
+++ b/platform/polySymbols/src/com/intellij/polySymbols/context/impl/PolyContextDiscovery.kt
@@ -48,6 +48,7 @@ import com.intellij.psi.PsiFile
 import com.intellij.psi.util.CachedValue
 import com.intellij.psi.util.CachedValueProvider
 import com.intellij.psi.util.CachedValuesManager
+import com.intellij.util.concurrency.ThreadingAssertions
 import com.intellij.util.concurrency.annotations.RequiresReadLock
 import com.intellij.util.containers.ContainerUtil
 import com.intellij.util.lazyUnsafe
@@ -90,6 +91,7 @@ private fun findPolyContext(kind: PolyContextKind, locationInfo: LocationInfo):
   ?: withContextChangeCheck(kind, locationInfo)
 
 private fun <T> forPsiLocation(location: PsiElement, action: (LocationInfo) -> T): T? {
+  ThreadingAssertions.assertReadAccess()
   if (!location.isValid) return null
   val project = location.project
   val psiFile = location.takeIf { it !is PsiDirectory }
@@ -111,6 +113,7 @@ private fun <T> forVfsLocation(
   psiFile: PsiFile? = null,
   action: (LocationInfo) -> T,
 ): T? {
+  ThreadingAssertions.assertReadAccess()
   ProgressManager.checkCanceled()
   if (project.isDisposed) return null
   val virtualFile = findOriginalFile(location)?.takeIf { it.isInLocalFileSystem }