为什么在这个Scala中会出现java.nio.BufferUnderflowException

scripting in Scala ,以处理某些日志文件:

scala> import io.Source
import io.Source

scala> import java.io.File
import java.io.File

scala> val f = new File(".")
f: java.io.File = .

scala> for (l <- f.listFiles) {
 |   val src = Source.fromFile(l).getLines
 |   println( (0 /: src) { (i, line) => i + 1 } )
 | }
3658
java.nio.BufferUnderflowException
        at java.nio.Buffer.nextGetIndex(Unknown Source)
        at java.nio.HeapCharBuffer.get(Unknown Source)
        at scala.io.BufferedSource$$anon$2.next(BufferedSource.scala:86)
        at scala.io.BufferedSource$$anon$2.next(BufferedSource.scala:74)
        at scala.io.Source$$anon$6.next(Source.scala:307)
        at scala.io.Source$$anon$6.next(Source.scala:301)
        at scala.Iterator$cla...

java.nio.BufferUnderflowException ?

注意-我正在处理10个日志文件,每个文件大小约为1MB