curses library in python 2.4.3 broken

[vnainar]

BPO	1464056
Nosy	@loewis, @akuchling
Files	panelw.diff

^{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/akuchling'
closed_at = <Date 2006-08-07.00:39:31.000>
created_at = <Date 2006-04-04.08:47:30.000>
labels = ['library']
title = 'curses library in python 2.4.3 broken'
updated_at = <Date 2006-08-07.00:39:31.000>
user = 'https://bugs.python.org/vnainar'

bugs.python.org fields:

activity = <Date 2006-08-07.00:39:31.000>
actor = 'akuchling'
assignee = 'akuchling'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2006-04-04.08:47:30.000>
creator = 'vnainar'
dependencies = []
files = ['1948']
hgrepos = []
issue_num = 1464056
keywords = []
message_count = 24.0
messages = ['28038', '28039', '28040', '28041', '28042', '28043', '28044', '28045', '28046', '28047', '28048', '28049', '28050', '28051', '28052', '28053', '28054', '28055', '28056', '28057', '28058', '28059', '28060', '28061']
nosy_count = 8.0
nosy_names = ['loewis', 'akuchling', 'nnorwitz', 'anthonybaxter', 'splitscreen', 'vnainar', 'atler_', 'psmedley']
pr_nums = []
priority = 'critical'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1464056'
versions = ['Python 2.4']

[vnainar]

My python programs using curses library do not work
with version 2.4.3.Even the 'ncurses.py ' demo program
in the Demo/curses directory does not work correctly.
The problem seems to be in the 'panels' library

[loewis]

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What do you mean by "do not work"? What operating system and
what curses implementation are you using?

[vnainar]

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Sorry my original post was incomplete. I am running
slackware 10.2 (linux kernel 2.6).The python library was
tested with ncurses 5.4 and ncurses 5.5( the latest
release). All programs run OK with 2.4.1.As I said ,the
curses demo that comes with the Python distributions runs OK
with 2.4.1 but
not with 2.4.3 - I have both on my machine

[atler]

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user_id=1497957

I confirm the problem. Every program using curses library
segfaults and there's only one error before it happens:

...
import curses # directory /usr/share/python2.4/curses
import curses # precompiled from
/usr/share/python2.4/curses/__init__.pyc
dlopen("/usr/lib/python2.4/lib-dynload/_curses.so", 2);
import _curses # dynamically loaded from
/usr/lib/python2.4/lib-dynload/_curses.so
import curses.wrapper # precompiled from
/usr/share/python2.4/curses/wrapper.pyc
import curses.panel # precompiled from
/usr/share/python2.4/curses/panel.pyc
dlopen("/usr/lib/python2.4/lib-dynload/_curses_panel.so", 2);
import _curses_panel # dynamically loaded from
/usr/lib/python2.4/lib-dynload/_curses_panel.so
Traceback (most recent call last):
  File "ncurses.py", line 273, in ?
    curses.wrapper(demo_panels)
  File "/usr/share/python2.4/curses/wrapper.py", line 49, in
wrapper
_curses.error: nocbreak() returned ERR

I'm running Linux (PLD) with Python 2.4.3 and ncurses 5.5.
With Python 2.4.2 everything worked fine.

[loewis]

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I can't reproduce any of this on Debian;
Demo/curses/ncurses.py runs fine. Can you please

1. run ldd on _curses.so, and report the output, and
2. edit setup.py, removing the lines that deal with ncursesw,
3. atler_: produce a gdb backtrace on the time of the crash,
   4: vnainar: please report what you mean by "does not work".
   Does it erase your hard disk? turn off the machine? Paint
   things blue instead of red?

[splitscreen]

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user_id=1126061

Cannot reproduce on Gentoo. All the files in the Demo/curses
directory run fine.

[atler]

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$ ldd /usr/lib/python2.4/lib-dynload/_curses.so
        libncursesw.so.5 => /usr/lib/libncursesw.so.5
(0x7004c000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x70080000)
        libc.so.6 => /lib/libc.so.6 (0x700e4000)
        libdl.so.2 => /lib/libdl.so.2 (0x70228000)
        libtinfow.so.5 => /usr/lib/libtinfow.so.5 (0x7023c000)
        /lib/ld-linux.so.2 (0x70000000)

...
Program received signal SIGSEGV, Segmentation fault.
0x7063947c in hide_panel () from /usr/lib/libpanel.so.5
gdb) bt
#0 0x7063947c in hide_panel () from /usr/lib/libpanel.so.5
#1 0x706254b8 in ?? () from
/usr/lib/python2.4/lib-dynload/_curses_panel.so
#2 0x706254b8 in ?? () from
/usr/lib/python2.4/lib-dynload/_curses_panel.so
Previous frame identical to this frame (corrupt stack?)

It seems that only programs using panel library cause
segfaults (all other demos run fine except ncurses.py),
sorry for a mistake in a last post.

loewis: I'm not sure I understand second point. What excatly
should be changed in setup.py?

[anthonybaxter]

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The buildbot boxes don't show this problem.

You might need to rebuild a Python with -g and unstripped to
get a useful backtrace.

[atler]

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More complete backtrace, I hope it will help:
http://pastebin.com/649445