Red Hat Bugzilla – Bug 794879
3 reference leaks found in libopensync-plugin-python-0.22-6.fc17 using gcc-with-cpychecker static analyzer
Last modified: 2015-02-17 09:07:28 EST
Description of problem:
I've been writing an experimental static analysis tool to detect bugs commonly occurring within C Python extension modules:
I ran the latest version of the tool (in git master; post 0.9) on
libopensync-plugin-python-0.22-6.fc17.src.rpm, and it reports various errors.
I've manually reviewed the issues reported by the tool, and although most of the issues are false positives, there appear to be 3 genuine reference leak bugs.
You can see a list of errors here, triaged into categories (from most significant to least significant):
Within the category "Reference count too low" the 1 issue reported looks like it could be a false positive
Within the category "Reference leaks" the 3 issues reported appear to be genuine leaks: it looks like the calls to PyObject_CallMethod should be using the "N" format code (which transfers ownership of the reference), rather than the "O" format code (which adds a new reference): the objects will become immortal, and not be cleaned up until the process exits.
Within the category "Possible reference leaks" the 1 issue reported could well be a false positive
Within the category "Returning (PyObject*)NULL without setting an exception" the 4 issues reported appear to be false positives due to a bug in my tool.
There may of course be other bugs in my checker tool.
Hope this is helpful; let me know if you need help reading the logs that the tool generates - I know that it could use some improvement.
Version-Release number of selected component (if applicable):
gcc-python-plugin post-0.9 git 771455b3128b1323e80bdda53939d8d140a84c68 running the checker in an *f16* chroot
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle.
Changing version to '19'.
(As we did not run this process for some time, it could affect also pre-Fedora 19 development
cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.)
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