Name: fb126949 Date: 03/21/2003


This is a spin-off of bug 4795377: closing sequencer sometimes crashes the VM. It was thought that this crash and the crash reported in the other bug have the same cause. Now that the cause of the loader crash is found, it is unlikely that it causes the close() crash, so I leave the other bug as it is.

When opening the file allaroun.mid (attached) twice with the Sequencer.setSequence(InputStream) method, Java Sound crashes the VM.

The MIDI file in question is corrupt, it has a wrong track length field. This should either cause an InvalidMidiDataException, or ignore the error and abort parsing the MIDI file. Under no circumstances should a MIDI file that weas downloaded from the Internet cause a crash.

The following program is used to reproduce the crash. Run it with

java MidiFileTester allaroun.mid allaroun.mid

It is important to specify the MIDI file twice, otherwise the internal buffer overrun is unlikely to occur.
import java.io.*;
import javax.sound.midi.*;

public class MidiFileTester {
    
    // 0: test with MidiSystem.getSequence(File)
    // 1: test with MidiSystem.getSequence(InputStream)
    // 2: test with Sequencer.setSequence(InputStream)
    static int TEST_METHOD=2;
    
    public static void main(String[] args) throws Exception {
if (args.length == 0) {
System.out.println("No parameter specified");
System.exit(1);
}
int total=0; int succ=0;
long startTime=System.currentTimeMillis();

switch (TEST_METHOD) {
case 0: System.out.println("Test using"
               +"MidiSystem.getSequence(File)");
               break;
case 1: System.out.println("Test using"
               +"MidiSystem.getSequence(InputStream)");
               break;
case 2: System.out.println("Test using"
               +"Sequencer.setSequence(InputStream)");
               break;
}
    
Sequencer s = null;
if (TEST_METHOD==2) {
s = MidiSystem.getSequencer();
s.open();
}

for (int i=0; i<args.length; i++) {
String filename = args[i];
File midiFile = new File(filename);
if (!midiFile.exists()) {
continue;
}
System.out.print(""+i+": "+filename+"...");
total++;
try {
//MidiFileFormat mff = MidiSystem.getMidiFileFormat(midiFile);
if (TEST_METHOD == 0) {
Sequence seq = MidiSystem.getSequence(midiFile);
}
if ((TEST_METHOD == 1) || (TEST_METHOD == 2)) {
BufferedInputStream bis = new BufferedInputStream(new
FileInputStream(midiFile));
if (TEST_METHOD == 1) {
Sequence seq = MidiSystem.getSequence(bis);
} else {
s.setSequence(bis);
}
}
succ++;
System.out.println("OK");
} catch (Exception e) {
System.out.println("FAILED:"+e.toString());
}
}
if (TEST_METHOD==2) {
s.close();
}
System.out.println(""+succ+"/"+total
             +" successful. Failed:"+(total-succ));
long duration=System.currentTimeMillis()-startTime;
System.out.println("Duration: "+(duration / 1000)
             +"s "+(duration % 1000)+"ms");
System.exit(0);
    }
}

===============================================================================
javafun:/home/heidiche/sound/4835956 26 % /net/koori.sfbay/p/jdk01/jdk/1.4.2/beta/b19/binaries/solaris-sparc/bin/java OpenCrash allaround.mid
Test usingSequencer.setSequence(InputStream)
0: ./allaroun.mid...OK
1: ./allaroun.mid...OK
2: ./allaroun.mid...OK
Duration: 4s 640ms
3/3 successful.
test SUCCESSFUL (i.e. no crash...)

Verified successful in Sol8.

###@###.### 2003-03-26
=====================================