================ @@ -257,6 +258,9 @@ class DWARFUnit { std::shared_ptr<DWARFUnit> DWO; + mutable llvm::sys::RWMutex m_cu_die_array_mutex; ---------------- jeffreytan81 wrote: These two do not align with the naming convention of other fields in this class. https://github.com/llvm/llvm-project/pull/91023