Please describe the problem:
I'm writing a rhythmbox plugin in python. I'm trying to read a file and parse it with xml.sax. The file is big, and I don't want to block rhythmbox's UI for 2 minutes, so I'm trying to use gnomevfs.async to do it.

When I run the code, I get the following line printed a bunch of times:
(rhythmbox:7409): libgnomevfs-WARNING **: Unknown job kind 9

and then rhythmbox segfaults:

GLib-ERROR **: gmem.c:135: failed to allocate 524288 bytes
aborting...
Segmentation fault!
Cannot display crash dialogue

Steps to reproduce:
Run the code below (taking out the "self" references, as it's not in a class anymore).

Actual results:


Expected results:
The file should be read and parsed, without blocking the UI.

Does this happen every time?
Yes.

Other information:
Here's the code in question:

def open_callback(self, handle, exc_type):
	times = 0
	if not exc_type:
		try:
			while True:
				handle.read(512*1024, self.read_callback) # file is about 5MB
		except EOFError:
			handle.close(lambda *args: None)
	else:
		handle.close(lambda *args: None)
	
def read_callback(self, handle, buf, exc_type, bytes_requested):
	self.parser.feed(buf)

gnomevfs.async.open("http://magnatune.com/info/song_info.xml", self.open_callback)