René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_pty: test_openpty() timed out after 3h 20min on aarch64 RHEL8 Refleaks 3.x: ","articleBody":"Is os.write(fd, data) guaranteed to write **all** bytes of *data*? Or can it write only *some* (first) bytes of *data*?\r\n\r\nExtract of the test:\r\n\r\n```py\r\n        debug(\"Writing chunked output\")\r\n        os.write(slave_fd, TEST_STRING_2[:5])\r\n        os.write(slave_fd, TEST_STRING_2[5:])\r\n        s2 = _readline(master_fd) # \u003c==== HERE LINE 181 ===\r\n        self.assertEqual(b'For my pet fish, Eric.\\n', normalize_output(s2))\r\n```\r\n\r\nwith:\r\n\r\n```py\r\ndef _readline(fd):\r\n    \"\"\"Read one line.  May block forever if no newline is read.\"\"\"\r\n    reader = io.FileIO(fd, mode='rb', closefd=False)\r\n    return reader.readline()\r\n```\r\n\r\naarch64 RHEL8 Refleaks 3.x:\r\n\r\n```\r\n3:22:48 load avg: 0.00 [467/467/1] test_pty worker non-zero exit code (Exit code 1)\r\nbeginning 6 repetitions\r\n123456\r\n/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.refleak/build/Lib/pty.py:95: DeprecationWarning: This process (pid=502171) is multi-threaded, use of forkpty() may lead to deadlocks in the child.\r\n  pid, fd = os.forkpty()\r\nhi there\r\n./home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.refleak/build/Lib/pty.py:95: DeprecationWarning: This process (pid=502171) is multi-threaded, use of forkpty() may lead to deadlocks in the child.\r\n  pid, fd = os.forkpty()\r\nTimeout (3:20:00)!\r\nThread 0x0000ffff9f154590 (most recent call first):\r\n  File \"/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.refleak/build/Lib/test/test_pty.py\", line 68 in _readline\r\n  File \"/home/buildbot/buildarea/3.x.cstratak-RHEL8-aarch64.refleak/build/Lib/test/test_pty.py\", line 181 in test_openpty\r\n  (...)\r\n```\r\n\r\nbuild: https://buildbot.python.org/all/#/builders/551/builds/883\r\n\r\ncc @serhiy-storchaka \n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-110677\n* gh-110742\n* gh-110743\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2023-10-11T02:28:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/110673/cpython/issues/110673"}