import gtk:- undefined symbol: Py_InitModule4

[nszabolcs]

Binary package hint: python-gtk2

'import gtk', 'import pango',.. results in 'Segmentation fault'

with python2.5-dbg the result is:

$ python-dbg
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:16)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gtk
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/var/lib/python-support/python2.5/gtk-2.0/gtk/__init__.py", line 48, in <module>
    from gtk import _gtk
ImportError: /var/lib/python-support/python2.5/gtk-2.0/gtk/_gtk_d.so: undefined symbol: Py_InitModule4
[23400 refs]

it's ubuntu hardy on a 32bit machine:
$ lsb_release -rd
Description: Ubuntu 8.04.1
Release: 8.04

with most recent python, python-gtk2, libgtk2.0-0 packages:
$ dpkg-query -W python python-gtk2 libgtk2.0-0
libgtk2.0-0 2.12.9-3ubuntu4
python 2.5.2-0ubuntu1
python-gtk2 2.12.1-0ubuntu1

[James Westby (james-w)]

Hi,

bug 86685 looks kind of similar, but they are certainly different
issues.

Thanks,

James

[nszabolcs (nszabolcs)]

meanwhile i realized the same problem happens with every module that has a c extension (ie. a .so module) eg. Tkinter or sqlite

>>> import Tkinter
>>> Tkinter.Tk()
Segmentation fault

with python-dbg:

>>> import Tkinter
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/lib-tk/Tkinter.py", line 41, in <module>
    raise ImportError, str(msg) + ', please install the python-tk package'
ImportError: /usr/lib/python2.5/lib-dynload/_tkinter.so: undefined symbol: Py_InitModule4, please install the python-tk package
[32869 refs]

the same happens when i use python2.4

(notice that the segfault does not happen immediately when i use non-debug python, with certain libs i could not produce segfaults while i still got the importerror in debug mode)

1 or 2 weeks ago everything worked fine and unfortunately i'm not sure what has been changed since then

so the bug is not pygtk related and i have no idea what could have caused it

[Matthias Klose (doko)]

install python-gtk2-dbg

[Matthias Klose (doko)]

> with python-dbg:
> >>> import Tkinter

is python-tk-dbg installed?

[nszabolcs (nszabolcs)]

python-gtk2-dbg was installed, but python-tk-dbg was not

i can't test tkinter right now (with running X), but i can confirm over ssh that it does not segfaults after import with installed python-tk-dbg
(same is true for sqlite: python-sqlite-dbg fixed the problem)

gtk however still has the problem:

$ dpkg-query -W python-gtk2-dbg
python-gtk2-dbg 2.12.1-0ubuntu1

$ python-dbg
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:16)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gtk
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/var/lib/python-support/python2.5/gtk-2.0/gtk/__init__.py", line 48, in <module>
    from gtk import _gtk
ImportError: /var/lib/python-support/python2.5/gtk-2.0/gtk/_gtk_d.so: undefined symbol: Py_InitModule4
[23397 refs]
>>>

i looked into the gtk,atk,pango,pangocairo modules with nm (these segfault after import) and compared the result to the builtin modules which work fine (/usr/lib/python2.5/lib-dynload/_*_d.so) and found the following:
those modules which work has the symbol
         U Py_InitModule4TraceRefs
while the gtk mudules has
         U Py_InitModule4
instead

hope this helps

[Launchpad Janitor (janitor)]

This bug was fixed in the package pygtk - 2.13.0-0ubuntu6

---------------
pygtk (2.13.0-0ubuntu6) intrepid; urgency=low

  * Fix broken -I flags during build causing python*-dbg shared libs to be
    unusable; LP: #282320.
    - New patch, 65_bogus-python-includes, don't override PYTHON_INCLUDES,
      it's already set by AM_CHECK_PYTHON_HEADERS; GNOME #556130.
    - New patch, 90_autoconf, update configure by running autoconf && rm -rf
      autom4te.cache.

 -- Loic Minier <email address hidden> Mon, 13 Oct 2008 15:11:32 +0200

[nszabolcs (nszabolcs)]

python*-dbg might be fixed but that's not the point
(who cares about dbg anyway..:)

the point is:

$ python
Python 2.5.2 (r252:60911, Jul 31 2008, 17:28:52)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gtk
Segmentation fault

and it's _not_ the dbg version (dbg version might be broken as well), so the bug is _not_ fixed.

i'm not sure if it helps, but here is a backtrace:

(gdb) bt
#0 0x00000000 in ?? ()
#1 0xb75bbe98 in gdk_window_new () from /usr/lib/libgdk-x11-2.0.so.0
#2 0xb75981ad in gdk_display_open () from /usr/lib/libgdk-x11-2.0.so.0
#3 0xb7575a5d in gdk_display_open_default_libgtk_only () from /usr/lib/libgdk-x11-2.0.so.0
#4 0xb772c7df in gtk_init_check () from /usr/lib/libgtk-x11-2.0.so.0
#5 0xb7aad327 in ?? () from /var/lib/python-support/python2.5/gtk-2.0/gtk/_gtk.so
#6 0x080ca5c6 in PyEval_EvalFrameEx (f=0x83826d4, throwflag=0) at ../Python/ceval.c:3557
#7 0x080c96e5 in PyEval_EvalFrameEx (f=0x8217444, throwflag=0) at ../Python/ceval.c:3659
#8 0x080cb1f7 in PyEval_EvalCodeEx (co=0x81998d8, globals=0x81a09bc, locals=0x81a09bc, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0,
    defcount=0, closure=0x0) at ../Python/ceval.c:2836
#9 0x080cb347 in PyEval_EvalCode (co=0x81998d8, globals=0x81a09bc, locals=0x81a09bc) at ../Python/ceval.c:494
#10 0x080dfdbc in PyImport_ExecCodeModuleEx (name=0xbffc4a67 "gtk", co=0x81998d8,
    pathname=0xbffc1967 "/var/lib/python-support/python2.5/gtk-2.0/gtk/__init__.pyc") at ../Python/import.c:675
#11 0x080e05bc in load_source_module (name=0xbffc4a67 "gtk", pathname=0xbffc1967 "/var/lib/python-support/python2.5/gtk-2.0/gtk/__init__.pyc",
    fp=0x8210ca8) at ../Python/import.c:959
#12 0x080e1bee in load_package (name=0xbffc4a67 "gtk", pathname=<value optimized out>) at ../Python/import.c:1015
#13 0x080e0b78 in import_submodule (mod=0x8147a18, subname=0xbffc4a67 "gtk", fullname=0xbffc4a67 "gtk") at ../Python/import.c:2400
#14 0x080e1037 in load_next (mod=0x8147a18, altmod=0x8147a18, p_name=<value optimized out>, buf=0xbffc4a67 "gtk", p_buflen=0xbffc4a60)
    at ../Python/import.c:2220
#15 0x080e1275 in import_module_level (name=0x0, globals=0xb7dac414, locals=<value optimized out>, fromlist=0x8147a18, level=-1)
    at ../Python/import.c:2001
#16 0x080e1717 in PyImport_ImportModuleLevel (name=0x81a8a34 "gtk", globals=0xb7da6acc, locals=0xb7da6acc, fromlist=0x8147a18, level=-1)
    at ../Python/import.c:2072
#17 0x080c2924 in builtin___import__ (self=0x0, args=0x81967d4, kwds=0x0) at ../Python/bltinmodule.c:47
#18 0x0805cb97 in PyObject_Call (func=0x1, arg=0x81967d4, kw=0x0) at ../Objects/abstract.c:1861
#19 0x080c2e9c in PyEval_CallObjectWithKeywords (func=0xb7d95e6c, arg=0x81967d4, kw=0x0) at ../Python/ceval.c:3442
#20 0x080c6757 in PyEval_EvalFrameEx (f=0x8210b5c, throwflag=0) at ../Python/ceval.c:2067
#21 0x080cb1f7 in PyEval_EvalCodeEx (co=0x81992a8, globals=0xb7da6acc, locals=0xb7da6acc, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0,
    defcount=0, closure=0x0) at ../Python/ceval.c:2836
#22 0x080cb347 in PyEval_EvalCode (co=0x81992a8, globals=0xb7da6acc, locals=0xb7da6acc) at ../Python/ceval....

[nszabolcs (nszabolcs)]

python -c 'import gtk' still segfaults
(it turns out that python-dbg had an unrelated issue)

[Loïc Minier (lool)]

The original bug you reported was about a traceback in python-dbg; it was a real bug and has been fixed with python-dbg now.

It's quite confusing to deal with two issues in the same bug report, and "import gtk" works for me. Please file different bugs for different issues. :-/

Could you please attach a strace as well as the output of ldd /usr/lib/python-support/python-gtk2/python2.5/gtk-2.0/gtk/_gtk.so to the bug?

Thanks!

[Loïc Minier (lool)]

You seem to have a "win2pid.so" preloaded. Could you please try without?

[nszabolcs (nszabolcs)]

sorry, the preloaded .so was the problem
thank you for your help