src/hotspot/cpu/x86/interp_masm_x86.cpp

*** 1252,1261 ****
--- 1252,1265 ----
      // Load immediate 1 into swap_reg %rax
      movl(swap_reg, (int32_t)1);
  
      // Load (object->mark() | 1) into swap_reg %rax
      orptr(swap_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
+     if (EnableValhalla && !UseBiasedLocking) {
+       // For slow path is_always_locked, using biased, which is never natural for !UseBiasLocking
+       andptr(swap_reg, ~markOopDesc::biased_lock_bit_in_place);
+     }
  
      // Save (object->mark() | 1) into BasicLock's displaced header
      movptr(Address(lock_reg, mark_offset), swap_reg);
  
      assert(lock_offset == 0,