src/hotspot/share/oops/oop.cpp

*** 103,114 ****
  bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
    if (!Universe::heap()->is_oop(obj)) {
      return false;
    }
  
!   // Header verification: the mark is typically non-NULL. If we're
!   // at a safepoint, it must not be null.
    // Outside of a safepoint, the header could be changing (for example,
    // another thread could be inflating a lock on this object).
    if (ignore_mark_word) {
      return true;
    }
--- 103,114 ----
  bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
    if (!Universe::heap()->is_oop(obj)) {
      return false;
    }
  
!   // Header verification: the mark is typically non-zero. If we're
!   // at a safepoint, it must not be zero.
    // Outside of a safepoint, the header could be changing (for example,
    // another thread could be inflating a lock on this object).
    if (ignore_mark_word) {
      return true;
    }