Fix test_importlib.test_bad_traverse for AIX

[aixtools]

BPO	34720
Nosy	@ned-deily, @aixtools, @miss-islington
PRs	bpo-34720: Fix test_importlib.test_bad_traverse for AIX #9391 [3.7] bpo-34720: Fix test_importlib.test_bad_traverse for AIX (GH-9391) #14238

^{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 2019-02-18.11:26:27.841>
created_at = <Date 2018-09-18.12:03:05.679>
labels = ['3.7', '3.8', 'type-bug', 'tests']
title = 'Fix test_importlib.test_bad_traverse for AIX'
updated_at = <Date 2019-09-10.13:30:21.197>
user = 'https://github.com/aixtools'

bugs.python.org fields:

activity = <Date 2019-09-10.13:30:21.197>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2019-02-18.11:26:27.841>
closer = 'ncoghlan'
components = ['Tests']
creation = <Date 2018-09-18.12:03:05.679>
creator = 'Michael.Felt'
dependencies = []
files = []
hgrepos = []
issue_num = 34720
keywords = ['patch']
message_count = 6.0
messages = ['325632', '335772', '337628', '337629', '337702', '351648']
nosy_count = 3.0
nosy_names = ['ned.deily', 'Michael.Felt', 'miss-islington']
pr_nums = ['9391', '14238']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34720'
versions = ['Python 3.7', 'Python 3.8']

[aixtools]

bpo-32374 added a new subtest (test_bad_traverse) in test_importlib. The test succeeds when a script calling a bad_traverse exits with a non-zero status (e.g., crashes because of segmentation violation)

This patch "fixes" Modules/_testmultiphase.c so that it exits with a non-zero status when a NULL pointer is accessed. This is what was causing other systems to 'crash' expectedly - while AIX was not.

A simple demo program to demonstrate the difference behavior of AIX:

/*
 * Program to show whether an executable crashes, or not
 * when a NULL pointer is accessed
 * Author: AIXTOOLS
 */

#include<stdio.h>
main()
{
        long *vpt = NULL;

    fprintf(stdout, "vpt = %08lx\n", (long) vpt);
    if (*vpt)
            fprintf(stdout,"True\n");
    else
            fprintf(stdout,"False\n");

}

On AIX:
root@x066:[/data/prj/python/git]make nullpr; ./nullpr
cc nullpr.c -o nullpr
vpt = 0000000
False

On a Linux server:
root@x074:/data/prj/python/git# rm nullpr; make nullpr; ./nullpr
make: Warning: File 'nullpr.c' has modification time 352 s in the future
cc nullpr.c -o nullpr
nullpr.c:8:1: warning: return type defaults to 'int' [-Wimplicit-int]
main()
^
make: warning: Clock skew detected. Your build may be incomplete.
vpt = 0000000
Segmentation fault

[miss-islington]

New changeset 1bf8845 by Miss Islington (bot) (Michael Felt) in branch 'master':
bpo-34720: Fix test_importlib.test_bad_traverse for AIX (GH-9391)
1bf8845

[aixtools]

Could this also be backported to 3.6 and 3.7 please?

[aixtools]

could this be backported to versions 3.7, and if applicable, to version 3.6

[aixtools]

On 10/03/2019 19:31, Michael Felt wrote:

Michael Felt <aixtools@felt.demon.nl> added the comment:

could this be backported to versions 3.7, and if applicable, to version 3.6
Only 3.7 - As 3.6 is in security mode.

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Python tracker <report@bugs.python.org>
<https://bugs.python.org/issue34720\>

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[ned-deily]

New changeset 61f34f9 by Ned Deily (Michael Felt) in branch '3.7':
bpo-34720: Fix test_importlib.test_bad_traverse for AIX (GH-14238)
61f34f9