valgrind detects problems in PyObject_Free

[jtajta2002]

BPO	1473000

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2006-04-21.03:59:32.000>
created_at = <Date 2006-04-19.14:12:46.000>
labels = ['interpreter-core', 'invalid']
title = 'valgrind detects problems in PyObject_Free'
updated_at = <Date 2006-04-21.03:59:32.000>
user = 'https://bugs.python.org/jtajta2002'

bugs.python.org fields:

activity = <Date 2006-04-21.03:59:32.000>
actor = 'nnorwitz'
assignee = 'nnorwitz'
closed = True
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2006-04-19.14:12:46.000>
creator = 'jtajta2002'
dependencies = []
files = []
hgrepos = []
issue_num = 1473000
keywords = []
message_count = 2.0
messages = ['28310', '28311']
nosy_count = 2.0
nosy_names = ['nnorwitz', 'jtajta2002']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1473000'
versions = ['Python 2.4']

[jtajta2002]

I just compiled python 2.4.3 with gcc 4.1.0, using
glibc-2.4, and the COPTS = -g -O2

I just run valgrind (version 3.1.1) python -v
And I get a lot of errors complaying about PyObject_Free:

Conditional jump or move depends on uninitialised value(s)
at 0x40B66A4: PyObject_Free (obmalloc.c:735)
by 0x40B1E71: dictresize (dictobject.c:495)
by 0x40B204D: PyDict_SetItemString (dictobject.c:1988)
by 0x41048E3: Py_InitModule4 (modsupport.c:82)
by 0x4116364: initposix (posixmodule.c:7895)
by 0x40FF281: init_builtin (import.c:1765)
by 0x40FF511: load_module (import.c:1694)
by 0x40FFB3F: import_submodule (import.c:2266)
by 0x40FFFEE: load_next (import.c:2086)
by 0x41001D6: PyImport_ImportModuleEx (import.c:1921)
by 0x40E23AD: builtin___import__ (bltinmodule.c:45)
by 0x40B2FCC: PyCFunction_Call (methodobject.c:108)
------------------------
Invalid read of size 4
at 0x40B669F: PyObject_Free (obmalloc.c:735)
by 0x4103B7E: PyMarshal_ReadLastObjectFromFile
(marshal.c:768)
by 0x40FCE53: read_compiled_module (import.c:723)
by 0x40FED89: load_source_module (import.c:891)
by 0x40FFB3F: import_submodule (import.c:2266)
by 0x40FFFEE: load_next (import.c:2086)
by 0x41001D6: PyImport_ImportModuleEx (import.c:1921)
by 0x40E23AD: builtin___import__ (bltinmodule.c:45)
by 0x40B2FCC: PyCFunction_Call (methodobject.c:108)
by 0x408BB36: PyObject_Call (abstract.c:1795)
by 0x40E580A: PyEval_CallObjectWithKeywords
(ceval.c:3430)
by 0x40E87D1: PyEval_EvalFrame (ceval.c:2020)
Address 0x4339010 is 232 bytes inside a block of size
352 free'd
at 0x4022E9D: free (vg_replace_malloc.c:235)
by 0x41FBD1B: __fopen_internal (in /lib/libc-2.4.so)
by 0x41FE569: fopen64 (in /lib/libc-2.4.so)
by 0x40FD626: find_module (import.c:1316)
by 0x40FFC64: import_submodule (import.c:2256)
by 0x40FFFEE: load_next (import.c:2086)
by 0x41001D6: PyImport_ImportModuleEx (import.c:1921)
by 0x40E23AD: builtin___import__ (bltinmodule.c:45)
by 0x40B2FCC: PyCFunction_Call (methodobject.c:108)
by 0x408BB36: PyObject_Call (abstract.c:1795)
by 0x40E580A: PyEval_CallObjectWithKeywords
(ceval.c:3430)
by 0x40E87D1: PyEval_EvalFrame (ceval.c:2020)
---------------------

Invalid read of size 4
at 0x40B669F: PyObject_Free (obmalloc.c:735)
by 0x4085A12: PyGrammar_RemoveAccelerators
(acceler.c:47)
by 0x41070DC: Py_Finalize (pythonrun.c:436)
by 0x410E2C4: Py_Main (main.c:513)
by 0x8048559: main (in /usr/bin/python)
Address 0x4364010 is 104 bytes inside a block of size
640 free'd
at 0x4022E9D: free (vg_replace_malloc.c:235)
by 0x40B66C0: PyObject_Free (obmalloc.c:798)
by 0x4085BA1: PyGrammar_AddAccelerators (acceler.c:124)
by 0x40866A7: PyParser_New (parser.c:77)
by 0x4086722: parsetok (parsetok.c:109)
by 0x4086C9E: PyParser_ParseStringFlags (parsetok.c:31)
by 0x4105FF3: PyParser_SimpleParseStringFlags
(pythonrun.c:1365)
by 0x410644A: PyRun_StringFlags (pythonrun.c:1222)
by 0x40E1CBA: builtin_eval (bltinmodule.c:527)
by 0x40B2FCC: PyCFunction_Call (methodobject.c:108)
by 0x40EAE9B: PyEval_EvalFrame (ceval.c:3563)
by 0x40EA6AA: PyEval_EvalFrame (ceval.c:3645)

--------------

ERROR SUMMARY: 9678 errors from 111 contexts
(suppressed: 36 from 1)
malloc/free: in use at exit: 715,180 bytes in 251 blocks.
malloc/free: 1,822 allocs, 1,571 frees, 1,552,763 bytes
allocated.
For counts of detected errors, rerun with: -v
searching for pointers to 251 not-freed blocks.
checked 664,740 bytes.

LEAK SUMMARY:
definitely lost: 10 bytes in 2 blocks.
possibly lost: 0 bytes in 0 blocks.
still reachable: 715,170 bytes in 249 blocks.
suppressed: 0 bytes in 0 blocks.

Best regards and many thanks for such an incredible
language.

[nnorwitz]

Logged In: YES
user_id=33168

Please read this file:
http://svn.python.org/projects/python/branches/release24-maint/Misc/README.valgrind

That should explain what's going on and how to fix it.