code: func (l *lockOrder) other(ptr interface{}) {
  	empty := true
  	for k := range l.cur {
  		if k == ptr {
  			continue
  		}
  		empty = false
  	}
  	if empty {
  		return
  	}
  	fmt.Fprintln(Opts.LogBuf, "Other goroutines holding locks:")
  	for k, pp := range l.cur {
  		if k == ptr {
  			continue
  		}
  		fmt.Fprintf(Opts.LogBuf, "goroutine %v lock %p\n", pp.gid, k)
  		printStack(Opts.LogBuf, pp.stack)
  	}
  	fmt.Fprintln(Opts.LogBuf)
  }
docs: // Under lo.mu Locked.