René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`test_zipfile64.[...].test_strip_removed_large_file_with_dd_no_sig` fails on BigMem runs","articleBody":"# Bug report\n\n### Bug description:\n\nFor example, in [this run](https://buildbot.python.org/#/builders/1832/builds/1633):\n\n```\n======================================================================\nFAIL: test_strip_removed_large_file_with_dd_no_sig (test.test_zipfile64.TestRepack.test_strip_removed_large_file_with_dd_no_sig)\nShould scan for the data descriptor (without signature) of a removed\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/home/buildbot/buildarea/3.x.diegorusso-aarch64-bigmem.bigmem/build/Lib/test/test_zipfile64.py\", line 214, in test_strip_removed_large_file_with_dd_no_sig\n    self.assertLess(peak, self.allowed_memory)\n    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^\nAssertionError: 603662 not less than 204800\n----------------------------------------------------------------------\n```\n\nI'm also able to reproduce this locally:\n\n```\n$ ./python -m test test_zipfile64 -u extralargefile -v -m test_strip_removed_large_file_with_dd_no_sig\n== CPython 3.16.0a0 (heads/main:f7e5cddcbbb, Jun 24 2026, 20:02:47) [GCC 15.2.1 20260123 (Red Hat 15.2.1-7)]\n== Linux-7.0.12-101.fc43.x86_64-x86_64-with-glibc2.42 little-endian\n== Python build: debug\n== cwd: /home/stan/dev/cpython/build/test_python_worker_124469æ\n== CPU count: 16\n== encodings: locale=UTF-8 FS=utf-8\n== resources (1): extralargefile\n\nUsing random seed: 2703420052\n0:00:00 load avg: 1.79 mem: 27.0 MiB Run 1 test sequentially in a single process\n0:00:00 load avg: 1.79 mem: 27.0 MiB [1/1] test_zipfile64\ntest_strip_removed_large_file_with_dd_no_sig (test.test_zipfile64.TestRepack.test_strip_removed_large_file_with_dd_no_sig)\nShould scan for the data descriptor (without signature) of a removed ... FAIL\n\n======================================================================\nFAIL: test_strip_removed_large_file_with_dd_no_sig (test.test_zipfile64.TestRepack.test_strip_removed_large_file_with_dd_no_sig)\nShould scan for the data descriptor (without signature) of a removed\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/home/stan/dev/cpython/Lib/test/test_zipfile64.py\", line 215, in test_strip_removed_large_file_with_dd_no_sig\n    self.assertLess(peak, self.allowed_memory)\n    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^\nAssertionError: 1027764 not less than 204800\n\n----------------------------------------------------------------------\nRan 1 test in 200.611s\n\nFAILED (failures=1)\ntest test_zipfile64 failed\n0:03:20 load avg: 1.57 mem: 32.0 MiB [1/1/1] test_zipfile64 failed (1 failure) in 3 min 20 sec\n\n== Tests result: FAILURE ==\n\n1 test failed:\n    test_zipfile64\n\nTotal duration: 3 min 20 sec\nTotal tests: run=1 (filtered) failures=1\nTotal test files: run=1/1 (filtered) failed=1\nResult: FAILURE\n```\n\nThis test was added recently in https://github.com/python/cpython/commit/aec0aed197872adf96d3f25fd5ea624508fcddbf by @danny0838 and @gpshead.\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-152203\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/StanFromIreland","@type":"Person","name":"StanFromIreland"},"datePublished":"2026-06-25T12:24:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/152190/cpython/issues/152190"}