Hi,
I'm having some issues with the Java bindings for librbd and I'm not
sure what the problem is here.
The problem is with listing snapshot of a RBD image. I test it in this
test case:
public void testCreateAndClone() {
try {
..
..
image.snapCreate(snapName);
image.snapProtect(snapName);
List<RbdSnapInfo> snaps = image.snapList();
assertEquals("There should only be one snapshot", 1, snaps.size());
..
..
}
}
This test fails 95% of the time with my whole JVM crashing.
The code to blame is in RbdImage.java:
public List<RbdSnapInfo> snapList() throws RbdException {
IntByReference numSnaps = new IntByReference(16);
PointerByReference snaps = new PointerByReference();
List<RbdSnapInfo> list = new ArrayList<RbdSnapInfo>();
RbdSnapInfo snapInfo, snapInfos[];
while (true) {
int r = rbd.rbd_snap_list(this.getPointer(), snaps, numSnaps);
if (r >= 0) {
numSnaps.setValue(r);
break;
} else {
throw new RbdException("Failed listing snapshots", r);
}
}
Pointer p = snaps.getValue(); <<<< crash
snapInfo = new RbdSnapInfo(p);
..
..
}
So it crashes when it wants to get the value of the snaps var.
I can't figure out why this is happening and why it isn't consistent.
I'm not a real JNA expert and I was hoping somebody around here would be
able to figure out what I'm doing wrong.
Any Java/JNA experts around who might have a clue?
The source of rados-java: https://github.com/wido/rados-java
--
Wido den Hollander
42on B.V.
Phone: +31 (0)20 700 9902
Skype: contact42on
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