Bug 807451 - Bugs found in Io-language-20080330-8.fc17.2 using gcc-with-cpychecker static analyzer
Summary: Bugs found in Io-language-20080330-8.fc17.2 using gcc-with-cpychecker static ...
Keywords:
Status: CLOSED EOL
Alias: None
Product: Fedora
Classification: Fedora
Component: Io-language
Version: 19
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Gwyn Ciesla
QA Contact: Fedora Extras Quality Assurance
URL: http://fedorapeople.org/~dmalcolm/gcc...
Whiteboard:
Depends On:
Blocks: cpychecker
TreeView+ depends on / blocked
 
Reported: 2012-03-27 20:01 UTC by Dave Malcolm
Modified: 2015-02-18 13:42 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-02-18 13:42:35 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Dave Malcolm 2012-03-27 20:01:57 UTC
Description of problem:
I've been writing an experimental static analysis tool to detect bugs commonly occurring within C Python extension modules:
  https://fedorahosted.org/gcc-python-plugin/
  http://gcc-python-plugin.readthedocs.org/en/latest/cpychecker.html
  http://fedoraproject.org/wiki/Features/StaticAnalysisOfPythonRefcounts

I ran the latest version of the tool (in git master; post 0.9) on
Io-language-20080330-8.fc17.2.src.rpm, and it reports various errors.

You can see a list of errors here, triaged into categories (from most significant to least significant):
http://fedorapeople.org/~dmalcolm/gcc-python-plugin/2012-03-27/Io-language-20080330-8.fc17.2/

I've manually reviewed the issues reported by the tool.

Within the category "Reference count too low" the 1 issue reported may well be a false positive: I don't understand the Io code enough to tell.

Within the category "Reference leaks" 2 of the 3 issues reported look like genuine bugs:
  source/IoPython.c:IoPython_import:ob_refcnt of '*pName' is 1 too high:
     the error handling path needs a Py_XDECREF(pName)

  source/IoPython.c:convertIo:ob_refcnt of return value is 1 too high
     the Py_INCREF(ret); appears to be erroneous

  source/IoPython.c:IoPython_call_int:ob_refcnt of '*pValue' is 1 too high
     I'm not sure if this is a bug or not 

Within the category "Segfaults within error-handling paths" the 3 issues reported look like genuine crashers under low-memory conditions.

Within the category "Possible reference leaks" the 2 issues reported may or may not be bugs; I can't tell.

Within the category "Returning (PyObject*)NULL without setting an exception" the 1 issue reported looks like a genuine bug: shouldn't this error-handling path set an exception?

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):
Io-language-20080330-8.fc17.2
gcc-python-plugin post-0.9 git 98d050a4691c4c6739341511d8a404adf0adfe6e running the checker in an *f16* chroot

Comment 1 Gwyn Ciesla 2012-05-07 19:34:46 UTC
Would it be possible to re-run this against the new version I just put in rawhide?

Comment 2 Fedora End Of Life 2013-04-03 19:31:12 UTC
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:
https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19

Comment 3 Fedora End Of Life 2015-01-09 21:57:11 UTC
This message is a notice that Fedora 19 is now at end of life. Fedora 
has stopped maintaining and issuing updates for Fedora 19. It is 
Fedora's policy to close all bug reports from releases that are no 
longer maintained. Approximately 4 (four) weeks from now this bug will
be closed as EOL if it remains open with a Fedora 'version' of '19'.

Package Maintainer: If you wish for this bug to remain open because you
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Comment 4 Fedora End Of Life 2015-02-18 13:42:35 UTC
Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

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