Bug 603340

Created attachment 423497 [details]
File: backtrace

I can't reproduce this with a filesystem based player, but it seems like python is raising an assertion. Assigning to the python package.

Thank you for reporting this bug.

How reproducible is this problem?  If you run the program from a terminal, is an error message printed?

What is the output of running the following command?
  rpm -q python python-libs python-debuginfo pygobject2

Looking at the backtrace, it looks like an assertion failed inside frame 2 of thread #1 inside PyFrame_New:
python: Objects/frameobject.c:633: PyFrame_New: Assertion `f->f_code == code' failed.

Frames #11 and above seem to be in GStreamer, IIRC frame #10 pyg_closure_marshal is in pygbject: a gstreamer callback is invoked, which turns out to be Python code, and it looks like the python code isn't valid.

The assertion that's failing is within this code:
	if (code->co_zombieframe != NULL) {
		f = code->co_zombieframe;
		code->co_zombieframe = NULL;
		_Py_NewReference((PyObject *)f);
		assert(f->f_code == code);
	}

The interpreter sees that the PyCodeObject has already had a PyFrameObject allocated that's no longer used, and tries to use that, rather than allocate a new PyFrameObject (an optimization), but the reused PyFrameObject doesn't point back at the PyCodeObject: something's gone wrong.

This could be:
- (i) a bug in the C code in /usr/lib64/python2.6/site-packages/gpod/_gpod.so that corrupts the internals of the process and happens to hit this value
- (ii) a bug in the way pygobject is setting up these callbacks
- (iii) a bug in python (but it would have to be very hard to reproduce)
- (iv) something else I haven't thought of

Reassigning component from "python" to "pygobject2" since I know we had a few issues with pygobject2 in the run-up to F-13.  Feel free to reassign back as necessary.

(In reply to comment #3)
> How reproducible is this problem?  If you run the program from a terminal, is
> an error message printed?

This abend occurs every time I run gpo (gpodder).  It's 100% reproduceable.  Here's the output from the console:

$ gpo sync
Plugin loaded: gpodder.soundcloud
Opening iPod database
iPod opened
Synchronizing: 1 of 10
Adding Top Gear - 2010-04-26
Synchronizing: 2 of 10
Adding Frontline - The Vaccine War - 2010-04-27
Synchronizing: 3 of 10
Adding House - The Choice - 2010-05-03
Synchronizing: 4 of 10
Adding Frontline - College, Inc. - 2010-05-04
Synchronizing: 5 of 10
Adding House - Baggage - 2010-05-10
Synchronizing: 6 of 10
Adding House - Help Me - 2010-05-27
Synchronizing: 7 of 10
Adding Burn Notice - Made Man - 2010-06-17
python: Objects/frameobject.c:633: PyFrame_New: Assertion `f->f_code == code' failed.
Aborted (core dumped)
$

> What is the output of running the following command?
>   rpm -q python python-libs python-debuginfo pygobject2

$ rpm -q python python-libs python-debuginfo pygobject2
python-2.6.4-27.fc13.x86_64
python-libs-2.6.4-27.fc13.x86_64
package python-debuginfo is not installed
pygobject2-2.21.1-6.fc13.x86_64

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