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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_fileio fails if strace version is too old","articleBody":"# Bug report\n\n### Bug description:\n\nMany failures in the test if the strace version doesn't support some of the options:\n\n```\n25-05-08T15:38:14.817Z] ======================================================================\n[2025-05-08T15:38:14.817Z] FAIL: test_syscalls_read (test.test_fileio.CAutoFileTests.test_syscalls_read) (name='open builtin with default options')\n[2025-05-08T15:38:14.817Z] Check set of system calls during common I/O patterns\n[2025-05-08T15:38:14.817Z] ----------------------------------------------------------------------\n[2025-05-08T15:38:14.817Z] Traceback (most recent call last):\n[2025-05-08T15:38:14.817Z]   File \"/bb/jenkins_work/python/workspace/python_python3.14-debian_PR-1/distro/refroot/amd64/opt/bb/lib64/python3.14/test/test_fileio.py\", line 381, in check_readall\n[2025-05-08T15:38:14.817Z]     syscalls = strace_helper.get_events(code, _strace_flags,\n[2025-05-08T15:38:14.817Z]                                           prelude=prelude,\n[2025-05-08T15:38:14.817Z]                                           cleanup=cleanup)\n[2025-05-08T15:38:14.817Z]   File \"/bb/jenkins_work/python/workspace/python_python3.14-debian_PR-1/distro/refroot/amd64/opt/bb/lib64/python3.14/test/support/strace_helper.py\", line 162, in get_events\n[2025-05-08T15:38:14.817Z]     trace = strace_python(to_run, strace_flags)\n[2025-05-08T15:38:14.817Z]   File \"/bb/jenkins_work/python/workspace/python_python3.14-debian_PR-1/distro/refroot/amd64/opt/bb/lib64/python3.14/test/support/strace_helper.py\", line 122, in strace_python\n[2025-05-08T15:38:14.817Z]     res.fail(cmd_line)\n[2025-05-08T15:38:14.817Z]     ~~~~~~~~^^^^^^^^^^\n[2025-05-08T15:38:14.817Z]   File \"/bb/jenkins_work/python/workspace/python_python3.14-debian_PR-1/distro/refroot/amd64/opt/bb/lib64/python3.14/test/support/script_helper.py\", line 80, in fail\n[2025-05-08T15:38:14.817Z]     raise AssertionError(f\"Process return code is {exitcode}\\n\"\n[2025-05-08T15:38:14.817Z]     ...\u003c10 lines\u003e...\n[2025-05-08T15:38:14.817Z]                          f\"---\")\n[2025-05-08T15:38:14.817Z] AssertionError: Process return code is 1\n[2025-05-08T15:38:14.817Z] command line: ['/usr/bin/strace', '--trace=%file,%desc', '/bb/jenkins_work/python/workspace/python_python3.14-debian_PR-1/distro/refroot/amd64/opt/bb/bin/python3.14', '-X', 'faulthandler', '-I', '-c', '\\nprint(\"MARK prelude\", flush=True)\\n\\nprint(\"MARK code\", flush=True)\\n\\nf = open(\\'@test_123835_tmpæ\\')\\nf.read()\\nf.close()\\n\\nprint(\"MARK cleanup\", flush=True)\\n\\nprint(\"MARK __shutdown\", flush=True)\\n']\n[2025-05-08T15:38:14.817Z] \n[2025-05-08T15:38:14.817Z] stdout:\n[2025-05-08T15:38:14.817Z] ---\n[2025-05-08T15:38:14.817Z] \n[2025-05-08T15:38:14.817Z] ---\n[2025-05-08T15:38:14.817Z] \n[2025-05-08T15:38:14.817Z] stderr:\n[2025-05-08T15:38:14.817Z] ---\n[2025-05-08T15:38:14.817Z] /usr/bin/strace: invalid option -- '-'\n[2025-05-08T15:38:14.817Z] Try '/usr/bin/strace -h' for more information.\n[2025-05-08T15:38:14.817Z] ---\n```\n\n### CPython versions tested on:\n\n3.14\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-133763\n* gh-133766\n* gh-133774\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/pablogsal","@type":"Person","name":"pablogsal"},"datePublished":"2025-05-09T12:22:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/133741/cpython/issues/133741"}