diff --git a/clang/include/clang/Basic/SourceManager.h b/clang/include/clang/Basic/SourceManager.h
--- a/clang/include/clang/Basic/SourceManager.h
+++ b/clang/include/clang/Basic/SourceManager.h
@@ -693,7 +693,7 @@
   ///
   /// Negative FileIDs are indexes into this table. To get from ID to an index,
   /// use (-ID - 2).
-  mutable SmallVector<SrcMgr::SLocEntry, 0> LoadedSLocEntryTable;
+  SmallVector<SrcMgr::SLocEntry, 0> LoadedSLocEntryTable;
 
   /// The starting offset of the next local SLocEntry.
   ///
@@ -775,6 +775,8 @@
 
   mutable std::unique_ptr<SrcMgr::ContentCache> FakeContentCacheForRecovery;
 
+  mutable std::unique_ptr<SrcMgr::SLocEntry> FakeSLocEntryForRecovery;
+
   /// Lazily computed map of macro argument chunks to their expanded
   /// source location.
   using MacroArgsMap = std::map<unsigned, SourceLocation>;
diff --git a/clang/lib/Basic/SourceManager.cpp b/clang/lib/Basic/SourceManager.cpp
--- a/clang/lib/Basic/SourceManager.cpp
+++ b/clang/lib/Basic/SourceManager.cpp
@@ -434,9 +434,11 @@
     // If the file of the SLocEntry changed we could still have loaded it.
     if (!SLocEntryLoaded[Index]) {
       // Try to recover; create a SLocEntry so the rest of clang can handle it.
-      LoadedSLocEntryTable[Index] = SLocEntry::get(
-          0, FileInfo::get(SourceLocation(), getFakeContentCacheForRecovery(),
-                           SrcMgr::C_User, ""));
+      if (!FakeSLocEntryForRecovery)
+        FakeSLocEntryForRecovery = std::make_unique<SLocEntry>(SLocEntry::get(
+            0, FileInfo::get(SourceLocation(), getFakeContentCacheForRecovery(),
+                             SrcMgr::C_User, "")));
+      return *FakeSLocEntryForRecovery;
     }
   }