curses test_curses.test_unget_wch crash

[cjerdonek]

BPO	15854
Nosy	@ned-deily, @cjerdonek
Superseder	bpo-15037: curses.unget_wch and test_curses fail when linked with ncurses 5.7 and earlier

^{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 2012-09-03.04:39:53.516>
created_at = <Date 2012-09-03.00:39:54.204>
labels = ['library']
title = 'curses test_curses.test_unget_wch crash'
updated_at = <Date 2012-09-03.04:57:37.509>
user = 'https://github.com/cjerdonek'

bugs.python.org fields:

activity = <Date 2012-09-03.04:57:37.509>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2012-09-03.04:39:53.516>
closer = 'ned.deily'
components = ['Library (Lib)']
creation = <Date 2012-09-03.00:39:54.204>
creator = 'chris.jerdonek'
dependencies = []
files = []
hgrepos = []
issue_num = 15854
keywords = []
message_count = 4.0
messages = ['169734', '169740', '169741', '169742']
nosy_count = 2.0
nosy_names = ['ned.deily', 'chris.jerdonek']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '15037'
type = None
url = 'https://bugs.python.org/issue15854'
versions = ['Python 3.3']

[cjerdonek]

As of: changeset: 78843:8ff2f4634ed8
date: Sun Sep 02 16:37:09 2012 -0400

I am getting this failure:

$ ./python.exe -m test -v -u curses test_curses
== CPython 3.3.0rc1+ (default:8ff2f4634ed8, Sep 2 2012, 16:02:43) [GCC 4.2.1 Compatible Apple Clang 3.1 (tags/Apple/clang-318.0.58)]
==   Darwin-11.4.0-x86_64-i386-64bit little-endian
==   .../build/test_python_17427
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1)
[1/1] test_curses
test test_curses crashed -- Traceback (most recent call last):
  File ".../Lib/test/regrtest.py", line 1221, in runtest_inner
    test_runner()
  File ".../Lib/test/test_curses.py", line 336, in test_main
    main(stdscr)
  File ".../Lib/test/test_curses.py", line 322, in main
    test_unget_wch(stdscr)
  File ".../Lib/test/test_curses.py", line 283, in test_unget_wch
    raise AssertionError("%r != %r" % (read, ch))
AssertionError: -61 != 'é'

Looks like this may be related to bpo-15785.

[ned-deily]

This is a duplicate of bpo-15037. test_unget_wch fails when linked with ncurses versions earlier than 5.8, which is the case with the Apple-supplied versions of ncurses in OS X versions through 10.8. (The python.org OS X installers for Python 3.3.x link with their own copy of libncursesw 5.9 to avoid this problem.)

[cjerdonek]

Okay, thanks, Ned. Out of curiosity, why is the stack trace here different from the one posted on that issue?

[ned-deily]

Different version of libncurses, different compiler and run time, different version and build options of Python 3.3, etc. The bug in ncurses causes junk to be stored and/or returned. In the one case, the junk triggered an overflow error, in the other, no overflow but still junk.