René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test.test_xml_etree*.XMLPullParserTest.test_simple_xml fails with (system) expat 2.6.0","articleBody":"# Bug report\n\n### Bug description:\n\n[Expat 2.6.0](https://github.com/libexpat/libexpat/blob/R_2_6_0/expat/Changes) was released yesterday, with CVE fixes. After upgrading the system library and building CPython `--with-system-expat`, I'm getting the following test failures:\n\n```pytb\n======================================================================\nFAIL: test_simple_xml (test.test_xml_etree.XMLPullParserTest.test_simple_xml) (chunk_size=1)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/home/mgorny/git/cpython/Lib/test/test_xml_etree.py\", line 1495, in test_simple_xml\n    self.assert_event_tags(parser, [('end', 'element')])\n    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/home/mgorny/git/cpython/Lib/test/test_xml_etree.py\", line 1480, in assert_event_tags\n    self.assertEqual([(action, elem.tag) for action, elem in events],\n    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n                     expected)\n                     ^^^^^^^^^\nAssertionError: Lists differ: [] != [('end', 'element')]\n\nSecond list contains 1 additional elements.\nFirst extra element 0:\n('end', 'element')\n\n- []\n+ [('end', 'element')]\n\n======================================================================\nFAIL: test_simple_xml (test.test_xml_etree.XMLPullParserTest.test_simple_xml) (chunk_size=5)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/home/mgorny/git/cpython/Lib/test/test_xml_etree.py\", line 1498, in test_simple_xml\n    self.assert_event_tags(parser, [\n    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^\n        ('end', 'element'),\n        ^^^^^^^^^^^^^^^^^^^\n        ('end', 'empty-element'),\n        ^^^^^^^^^^^^^^^^^^^^^^^^^\n        ])\n        ^^\n  File \"/home/mgorny/git/cpython/Lib/test/test_xml_etree.py\", line 1480, in assert_event_tags\n    self.assertEqual([(action, elem.tag) for action, elem in events],\n    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n                     expected)\n                     ^^^^^^^^^\nAssertionError: Lists differ: [('end', 'element')] != [('end', 'element'), ('end', 'empty-element')]\n\nSecond list contains 1 additional elements.\nFirst extra element 1:\n('end', 'empty-element')\n\n- [('end', 'element')]\n+ [('end', 'element'), ('end', 'empty-element')]\n\n----------------------------------------------------------------------\n======================================================================\nFAIL: test_simple_xml (test.test_xml_etree_c.XMLPullParserTest.test_simple_xml) (chunk_size=1)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/home/mgorny/git/cpython/Lib/test/test_xml_etree.py\", line 1495, in test_simple_xml\n    self.assert_event_tags(parser, [('end', 'element')])\n    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/home/mgorny/git/cpython/Lib/test/test_xml_etree.py\", line 1480, in assert_event_tags\n    self.assertEqual([(action, elem.tag) for action, elem in events],\n    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n                     expected)\n                     ^^^^^^^^^\nAssertionError: Lists differ: [] != [('end', 'element')]\n\nSecond list contains 1 additional elements.\nFirst extra element 0:\n('end', 'element')\n\n- []\n+ [('end', 'element')]\n\n======================================================================\nFAIL: test_simple_xml (test.test_xml_etree_c.XMLPullParserTest.test_simple_xml) (chunk_size=5)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/home/mgorny/git/cpython/Lib/test/test_xml_etree.py\", line 1498, in test_simple_xml\n    self.assert_event_tags(parser, [\n    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^\n        ('end', 'element'),\n        ^^^^^^^^^^^^^^^^^^^\n        ('end', 'empty-element'),\n        ^^^^^^^^^^^^^^^^^^^^^^^^^\n        ])\n        ^^\n  File \"/home/mgorny/git/cpython/Lib/test/test_xml_etree.py\", line 1480, in assert_event_tags\n    self.assertEqual([(action, elem.tag) for action, elem in events],\n    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n                     expected)\n                     ^^^^^^^^^\nAssertionError: Lists differ: [('end', 'element')] != [('end', 'element'), ('end', 'empty-element')]\n\nSecond list contains 1 additional elements.\nFirst extra element 1:\n('end', 'empty-element')\n\n- [('end', 'element')]\n+ [('end', 'element'), ('end', 'empty-element')]\n\n----------------------------------------------------------------------\n```\n\nI have reproduced with 3.11.8, 3.12.8 and main as of 2afc7182e66635b3ec7efb59d2a6c18a7ad1f215, both using Gentoo ebuild and raw git repository. I've tested the latter like this:\n\n```\n./configure -C --with-system-expat\nmake -j12\n./python -u -W default -bb -E -m test -vv test_xml_etree{,_c}\n```\n\nCC @hartwork \n\n### CPython versions tested on:\n\n3.11, 3.12, CPython main branch\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-115138\n* gh-115164\n* gh-115288\n* gh-115289\n* gh-115525\n* gh-115535\n* gh-115536\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/mgorny","@type":"Person","name":"mgorny"},"datePublished":"2024-02-07T10:08:53.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/115133/cpython/issues/115133"}