Infinite 100% CPU usage at java.io.FileInputStream.readBytes(Native Method)

I'm right now debugging a program which has two threads per one external process, and those two threads keep on reading Process.getErrorStream() and Process.getInputStream() using a while ((i = in.read(buf, 0, buf.length)) >= 0) loop.

Sometimes when the external process crashes due to a JVM crash (see these hs_err_pid.log files), those threads which read the stdout/stderr of that external process begin consuming 100% CPU and never exit. The loop body is not being executed (I've added a logging statement there), so the infinite loop appears to be inside the native method java.io.FileInputStream.readBytes.

I've reproduced this on both Windows 7 64-bit (jdk1.6.0_30 64-bit, jdk1.7.0_03 64-bit), and Linux 2.6.18 (jdk1.6.0_21 32-bit). The code in question is here and it is used like this. See those links for the full code - here are the interesting bits:

private final byte[]              buf = new byte[256];
private final InputStream         in;
...    

int i;
while ((i = this.in.read(this.buf, 0, this.buf.length)) >= 0) {
    ...
}

The stack traces look like

"PIT Stream Monitor" daemon prio=6 tid=0x0000000008869800 nid=0x1f70 runnable [0x000000000d7ff000]
   java.lang.Thread.State: RUNNABLE
    at java.io.FileInputStream.readBytes(Native Method)
    at java.io.FileInputStream.read(FileInputStream.java:220)
    at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
    at java.io.BufferedInputStream.read1(BufferedInputStream.java