Red Hat Bugzilla – Bug 809578
Bugs found in python-kaa-base-0.6.0-6.fc17 using gcc-with-cpychecker static analyzer
Last modified: 2015-02-17 09:12:02 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
python-kaa-base-0.6.0-6.fc17.src.rpm, and it reports various errors.
You can see a list of errors here, triaged into categories (from most significant to least significant):
I've manually reviewed the issues reported by the tool.
Within the category "Unclassified errors" the 7 issues reported appear to all be false-positives: the checker isn't properly handling the semctl_arg struct/union.
Within the category "Segfaults in normal paths" the 2 issues reported appear to be false positives due to a bug in my tool, which I've filed as https://fedorahosted.org/gcc-python-plugin/ticket/39
Within the category "Reference count too low" the 2 issues reported appear to be a genuine bug: this line appears to be bogus:
1103 Py_DECREF(o); /* the owned reference in shm_dict doesn't count! */
Within the category "Reference leaks" the 7 issues reported appear to be genuine reference leak bugs.
Within the category "Reference leak within initialization" the 1 issues reported is inconsequential.
Within the category "Segfaults within error-handling paths" the 5 issues reported appear to be genuine crashers under low-memory conditions, where a call to PyInt_FromLong could fail (for values outside the range -5...256, which always succeeds)
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 d578ee0e46d93647d0f94502784f890c38139d60 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.)
More information and reason for this action is here:
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