python-renpy crashes in rw_close_th when the scene changes

[Gregor Riepl]

I tried running the Ren'Py game "Analogue - A Hate Story" (the Steam version in my case) with the renpy build from Ubuntu 12.10 (6.13.12-1build1).
After the intro, the game does not switch over to the main menu, but crashes in rw_close_th.

I couldn't find debug symbols for the the python-renpy package, so I apt-get source'd renpy and disabled the dh_strip stage, then built and reinstalled it. A resulting gdb stack trace is attached.

As I don't understand Python/C very well, I just took a wild guess at why the crash is happening. Based on the assumption that PyObject_GetAttrString does not increase the reference count, I added Py_INCREF() calls to fetch_object_methods(). If this is incorrect, I can see another bug here: if the PyCallable_Check() call returns false, the references are never decremented. With the reference count increase, the crash vanishes, but I can't tell if this instead creates a memory leak. It would be great if a Python guru could provide some insight.

Upstream versions were not tested.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: python-renpy 6.13.12-1build1
ProcVersionSignature: Ubuntu 3.5.0-19.30-generic 3.5.7
Uname: Linux 3.5.0-19-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Tue Dec 4 04:18:23 2012
InstallationDate: Installed on 2012-10-17 (47 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120822.4)
MarkForUpload: True
SourcePackage: renpy
UpgradeStatus: Upgraded to quantal on 2012-11-30 (3 days ago)

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "Patch that increases the reference count on the python method references" of this bug report has been identified as being a patch. The ubuntu-reviewers team has been subscribed to the bug report so that they can review the patch. In the event that this is in fact not a patch you can resolve this situation by removing the tag 'patch' from the bug report and editing the attachment so that it is not flagged as a patch. Additionally, if you are member of the ubuntu-reviewers team please also unsubscribe the team from this bug report.

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