src/share/vm/runtime/thread.cpp

*** 4283,4293 ****
      ALL_JAVA_THREADS(p) {
        // first, see if owner is the address of a Java thread
        if (owner == (address)p) return p;
      }
    }
!   assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled");
    if (UseHeavyMonitors) return NULL;
  
    //
    // If we didn't find a matching Java thread and we didn't force use of
    // heavyweight monitors, then the owner is the stack address of the
--- 4283,4295 ----
      ALL_JAVA_THREADS(p) {
        // first, see if owner is the address of a Java thread
        if (owner == (address)p) return p;
      }
    }
!   // Cannot assert on lack of success here since this function may be
!   // used by code that is trying to report useful problem information
!   // like deadlock detection.
    if (UseHeavyMonitors) return NULL;
  
    //
    // If we didn't find a matching Java thread and we didn't force use of
    // heavyweight monitors, then the owner is the stack address of the
*** 4301,4311 ****
          the_owner = q;
          break;
        }
      }
    }
!   assert(the_owner != NULL, "Did not find owning Java thread for lock word address");
    return the_owner;
  }
  
  // Threads::print_on() is called at safepoint by VM_PrintThreads operation.
  void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) {
--- 4303,4313 ----
          the_owner = q;
          break;
        }
      }
    }
!   // cannot assert on lack of success here; see above comment
    return the_owner;
  }
  
  // Threads::print_on() is called at safepoint by VM_PrintThreads operation.
  void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) {