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Embedded python crashed on 4th run, if "ctypes" is used #51118

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Embedded python crashed on 4th run, if "ctypes" is used#51118
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theller
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topic-ctypestype-crashA hard crash of the interpreter, possibly with a core dump

Description

@warlock
warlock
mannequin
opened on Sep 9, 2009
BPO 6869
Nosy @theller
Files
  • fix_ctypes_crash.patch
    		•

    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 = 'https://github.com/theller'
closed_at = <Date 2010-08-08.18:29:31.227>
created_at = <Date 2009-09-09.08:31:13.900>
labels = ['ctypes', 'type-crash']
title = 'Embedded python crashed on 4th run, if "ctypes" is used'
updated_at = <Date 2010-09-12.16:20:38.048>
user = 'https://bugs.python.org/warlock'

    bugs.python.org fields:

    activity = <Date 2010-09-12.16:20:38.048>
actor = 'ocean-city'
assignee = 'theller'
closed = True
closed_date = <Date 2010-08-08.18:29:31.227>
closer = 'theller'
components = ['ctypes']
creation = <Date 2009-09-09.08:31:13.900>
creator = 'warlock'
dependencies = []
files = ['14936']
hgrepos = []
issue_num = 6869
keywords = ['patch']
message_count = 7.0
messages = ['92444', '92449', '92555', '92880', '102369', '113297', '116211']
nosy_count = 7.0
nosy_names = ['theller', 'ocean-city', 'warlock', 'mkp', 'robince', 'nik.lutz@gmail.com', 'tanaga']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'patch review'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue6869'
versions = ['Python 3.1', 'Python 2.7', 'Python 3.2']

    Activity

    1. warlock commented on Sep 9, 2009

      @warlock
      warlockmannequin
      on Sep 9, 2009
      MannequinAuthor

      When embedding python from C, and importing "ctypes" module in embedded
      script, it always crashes on Py_Finalize() on 4th cycle.
      Tested with both PyRun_SimpleString(...) and PyRun_String(...).
      Platform: Windows XP
      IDE's: LabWindows/CVI 8.5 and Code::Blocks/gcc

      Code:
      --------------------------

      #include <stdio.h>
#include <python.h>

int main()
{
    int i;
    for (i=0; i<10; i++)
    {
        printf("--- %d ---\n", i);
        Py_Initialize();
        PyRun_SimpleString("import ctypes");
        Py_Finalize();
    }
    return 0;
}

      Output:
      --------------------------------
      --- 0 ---
      --- 1 ---
      --- 2 ---
      --- 3 ---

      Process returned -1073741819 (0xC0000005) execution time : 3.109 s
      Press any key to continue.
      --------------------------------

    2. warlock
      assigned
      theller
      on Sep 9, 2009
    3. warlock
      added
      topic-ctypes
      type-crashA hard crash of the interpreter, possibly with a core dump
      on Sep 9, 2009

    4. warlock commented on Sep 9, 2009

      @warlock
      warlockmannequin
      on Sep 9, 2009
      MannequinAuthor
      Tested
   obj=PyImport_ImportModule("ctypes");
   Py_DECREF(obj);
instead of PyRun_SimpleString(...) - same result

    5. mkp commented on Sep 12, 2009

      @mkp
      mkpmannequin
      on Sep 12, 2009
      Mannequin

      on python2.5 / mac os x 10.5.7:

      $ cat main.c
#include <stdio.h>
#include <python.h>

int main()
{
    int i;
    for (i=0; i<10; i++)
    {
        printf("--- %d ---\n", i);
        Py_Initialize();
        PyRun_SimpleString("import ctypes");
        Py_Finalize();
    }
    return 0;
}
      $ gcc -I/usr/include/python2.5/ -L/usr/lib/python2.5/ -lpython main.c
$ ./a.out 
--- 0

      --- 1 ---
      --- 2 ---
      --- 3 ---
      Assertion failed: (type->tp_flags & Py_TPFLAGS_HEAPTYPE), function
      type_dealloc, file Objects/typeobject.c, line 2148.
      Abort trap
      $ uname -mprsv
      Darwin 9.7.0 Darwin Kernel Version 9.7.0: Tue Mar 31 22:52:17 PDT 2009;
      root:xnu-1228.12.14~1/RELEASE_I386 i386 i386

    6. ocean-city commented on Sep 20, 2009

      @ocean-city
      ocean-citymannequin
      on Sep 20, 2009
      Mannequin

      I hope attached patch will fix this issue.

    7. niklutzgmailcom commented on Apr 5, 2010

      @niklutzgmailcom
      niklutzgmailcommannequin
      on Apr 5, 2010
      Mannequin

      I can confirm that the patch fix this issue. I adapted the patch (variable names changed):

      5523a5524

          Py_INCREF(&Struct_Type);

      5529a5531

          Py_INCREF(&Union_Type);

      5535a5538

          Py_INCREF(&Pointer_Type);

      5541a5545

          Py_INCREF(&Array_Type);

      5547a5552

          Py_INCREF(&Simple_Type);

      5553a5559

          Py_INCREF(&CFuncPtr_Type);

      Platform: Linux (kubuntu 9.10 x64)
      Python: 2.6.4-0ubuntu3

    8. theller commented on Aug 8, 2010

      @theller
      theller
      on Aug 8, 2010

      Fixed in rev 83841 (py3k), rev 83842 (release31-maint), and rev 83843 (release27-maint).

      Thanks for the patch.

    9. theller
      closed this as completedon Aug 8, 2010

    10. ocean-city commented on Sep 12, 2010

      @ocean-city
      ocean-citymannequin
      on Sep 12, 2010
      Mannequin

      I found another refcount bug in Python3.x.
      Fixed in r84741(py3k), r84742(release31-maint).

    11. ezio-melotti
      transferred this issue fromon Apr 10, 2022
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