In ensureSize below, when n > Int.MaxValue then newsize: Int may overflow (newsize = newsize * 2) and become negative. Once negative the while loop will never terminate.

How to reproduce: fill an ArrayBuffer with about 2GB of Bytes.

protected def ensureSize(n: Int) {
if (n > array.length) {
var newsize = array.length * 2
while (n > newsize)
newsize = newsize * 2

  val newar: Array[AnyRef] = new Array(newsize)
  scala.compat.Platform.arraycopy(array, 0, newar, 0, size0)
  array = newar
}

}