Index: include/lldb/Expression/DWARFExpression.h
===================================================================
--- include/lldb/Expression/DWARFExpression.h
+++ include/lldb/Expression/DWARFExpression.h
@@ -40,8 +40,10 @@
   enum LocationListFormat : uint8_t {
     NonLocationList,     // Not a location list
     RegularLocationList, // Location list format used in non-split dwarf files
-    SplitDwarfLocationList, // Location list format used in split dwarf files
-    LocLists,               // Location list format used in DWARF v5 (.debug_loclists).
+    SplitDwarfLocationList, // Location list format used in pre-DWARF v5 split
+                            // dwarf files (.debug_loc.dwo)
+    LocLists,               // Location list format used in DWARF v5
+                            // (.debug_loclists/.debug_loclists.dwo).
   };
 
   //------------------------------------------------------------------
@@ -153,7 +155,7 @@
   lldb::addr_t GetLocation_DW_OP_addr(uint32_t op_addr_idx, bool &error) const;
 
   bool Update_DW_OP_addr(lldb::addr_t file_addr);
-  
+
   void SetModule(const lldb::ModuleSP &module) { m_module_wp = module; }
 
   bool ContainsThreadLocalStorage() const;
Index: source/Expression/DWARFExpression.cpp
===================================================================
--- source/Expression/DWARFExpression.cpp
+++ source/Expression/DWARFExpression.cpp
@@ -3029,7 +3029,9 @@
   if (!debug_loc_data.ValidOffset(*offset_ptr))
     return false;
 
-  switch (dwarf_cu->GetSymbolFileDWARF()->GetLocationListFormat()) {
+  DWARFExpression::LocationListFormat format =
+      dwarf_cu->GetSymbolFileDWARF()->GetLocationListFormat();
+  switch (format) {
   case NonLocationList:
     return false;
   case RegularLocationList:
@@ -3051,7 +3053,9 @@
     case DW_LLE_startx_length: {
       uint64_t index = debug_loc_data.GetULEB128(offset_ptr);
       low_pc = ReadAddressFromDebugAddrSection(dwarf_cu, index);
-      uint32_t length = debug_loc_data.GetU32(offset_ptr);
+      uint64_t length = (format == LocLists)
+                            ? debug_loc_data.GetULEB128(offset_ptr)
+                            : debug_loc_data.GetU32(offset_ptr);
       high_pc = low_pc + length;
       return true;
     }