René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"parallel/test-fastutf8stream-flush-mocks and parallel/test-fastutf8stream-sync are flaky on Windows","articleBody":"From https://github.com/nodejs/reliability/blob/main/reports/2025-08-26.md\n\n| Reason | \u003ccode>parallel/test-fastutf8stream-flush-mocks\u003c/code> |\n| - | :- |\n| Type | JS_TEST_FAILURE |\n| Failed PR | 14 ([https://github.com/nodejs/node/pull/59567/](https://ci.nodejs.org/job/node-test-pull-request/68781/), [https://github.com/nodejs/node/pull/59570/](https://ci.nodejs.org/job/node-test-pull-request/68804/), [https://github.com/nodejs/node/pull/59571/](https://ci.nodejs.org/job/node-test-pull-request/68807/), [https://github.com/nodejs/node/pull/59350/](https://ci.nodejs.org/job/node-test-pull-request/68809/), [https://github.com/nodejs/node/pull/59527/](https://ci.nodejs.org/job/node-test-pull-request/68817/), [https://github.com/nodejs/node/pull/59579/](https://ci.nodejs.org/job/node-test-pull-request/68824/), [https://github.com/nodejs/node/pull/59595/](https://ci.nodejs.org/job/node-test-pull-request/68838/), [https://github.com/nodejs/node/pull/58155/](https://ci.nodejs.org/job/node-test-pull-request/68839/), [https://github.com/nodejs/node/pull/58680/](https://ci.nodejs.org/job/node-test-pull-request/68847/), [https://github.com/nodejs/node/pull/59601/](https://ci.nodejs.org/job/node-test-pull-request/68849/), [https://github.com/nodejs/node/pull/58797/](https://ci.nodejs.org/job/node-test-pull-request/68851/), [https://github.com/nodejs/node/pull/59576/](https://ci.nodejs.org/job/node-test-pull-request/68856/), [https://github.com/nodejs/node/pull/59179/](https://ci.nodejs.org/job/node-test-pull-request/68866/), [https://github.com/nodejs/node/pull/59603/](https://ci.nodejs.org/job/node-test-pull-request/68867/)) |\n| Appeared | [test-rackspace-win2016_vs2015-x64-1](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=1,nodes=win2016-COMPILED_BY-vs2022-x86/36509/console), [test-rackspace-win2016_vs2015-x64-2](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=2,nodes=win2016-COMPILED_BY-vs2022-x86/36452/console), [test-azure_msft-win2016_vs2017-x64-1](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=1,nodes=win2016-COMPILED_BY-vs2022-x86/36439/console) |\n| First CI | https://ci.nodejs.org/job/node-test-pull-request/68781/ |\n| Last CI | https://ci.nodejs.org/job/node-test-pull-request/68867/ |\n\n\u003cdetails>\n\u003csummary>\u003ca href=\"https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=1,nodes=win2016-COMPILED_BY-vs2022-x86/36509/console\">Example\u003c/a>\u003c/summary>\n\n```\nnot ok 319 parallel/test-fastutf8stream-flush-mocks\n  ---\n  duration_ms: 928.99500\n  severity: fail\n  exitcode: 1\n  stack: |-\n    Can't clean tmpdir: C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\.tmp.302\n    Files blocking: [\n      'fastutf8stream-2252-1756150137626-0.log',\n      'fastutf8stream-2252-1756150137632-2.log'\n    ]\n    \n    C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\common\\tmpdir.js:80\n        throw e;\n        ^\n    \n    Error: ENOTEMPTY: directory not empty, rmdir 'C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\.tmp.302'\n        at Object.rmdirSync (node:fs:1206:11)\n        at _rmdirSync (node:internal/fs/rimraf:261:21)\n        at rimrafSync (node:internal/fs/rimraf:194:7)\n        at Object.rmSync (node:fs:1252:10)\n        at rmSync (C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\common\\tmpdir.js:31:8)\n        at onexit (C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\common\\tmpdir.js:65:5)\n        at process.\u003canonymous> (C:\\workspace\\no...\n```\n\u003c/details>\n\n-------\n\n| Reason | \u003ccode>parallel/test-fastutf8stream-sync\u003c/code> |\n| - | :- |\n| Type | JS_TEST_FAILURE |\n| Failed PR | 14 ([https://github.com/nodejs/node/pull/59567/](https://ci.nodejs.org/job/node-test-pull-request/68781/), [https://github.com/nodejs/node/pull/59570/](https://ci.nodejs.org/job/node-test-pull-request/68804/), [https://github.com/nodejs/node/pull/59571/](https://ci.nodejs.org/job/node-test-pull-request/68807/), [https://github.com/nodejs/node/pull/59350/](https://ci.nodejs.org/job/node-test-pull-request/68809/), [https://github.com/nodejs/node/pull/59527/](https://ci.nodejs.org/job/node-test-pull-request/68817/), [https://github.com/nodejs/node/pull/59579/](https://ci.nodejs.org/job/node-test-pull-request/68824/), [https://github.com/nodejs/node/pull/59595/](https://ci.nodejs.org/job/node-test-pull-request/68838/), [https://github.com/nodejs/node/pull/58155/](https://ci.nodejs.org/job/node-test-pull-request/68839/), [https://github.com/nodejs/node/pull/58680/](https://ci.nodejs.org/job/node-test-pull-request/68847/), [https://github.com/nodejs/node/pull/59601/](https://ci.nodejs.org/job/node-test-pull-request/68849/), [https://github.com/nodejs/node/pull/58797/](https://ci.nodejs.org/job/node-test-pull-request/68851/), [https://github.com/nodejs/node/pull/59576/](https://ci.nodejs.org/job/node-test-pull-request/68856/), [https://github.com/nodejs/node/pull/59179/](https://ci.nodejs.org/job/node-test-pull-request/68866/), [https://github.com/nodejs/node/pull/59603/](https://ci.nodejs.org/job/node-test-pull-request/68867/)) |\n| Appeared | [test-rackspace-win2016_vs2015-x64-2](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=2,nodes=win2016-COMPILED_BY-vs2022-x86/36509/console), [test-azure_msft-win2016_vs2017-x64-2](https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=3,nodes=win2016-COMPILED_BY-vs2022-x86/36452/console) |\n| First CI | https://ci.nodejs.org/job/node-test-pull-request/68781/ |\n| Last CI | https://ci.nodejs.org/job/node-test-pull-request/68867/ |\n\n\u003cdetails>\n\u003csummary>\u003ca href=\"https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=2,nodes=win2016-COMPILED_BY-vs2022-x86/36509/console\">Example\u003c/a>\u003c/summary>\n\n```\nnot ok 314 parallel/test-fastutf8stream-sync\n  ---\n  duration_ms: 1050.01600\n  severity: fail\n  exitcode: 1\n  stack: |-\n    Can't clean tmpdir: C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\.tmp.304\n    Files blocking: [\n      'fastutf8stream-4936-1756150148470-2.log',\n      'fastutf8stream-4936-1756150148534-7.log'\n    ]\n    \n    C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\common\\tmpdir.js:80\n        throw e;\n        ^\n    \n    Error: ENOTEMPTY: directory not empty, rmdir 'C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\.tmp.304'\n        at Object.rmdirSync (node:fs:1206:11)\n        at _rmdirSync (node:internal/fs/rimraf:261:21)\n        at rimrafSync (node:internal/fs/rimraf:194:7)\n        at Object.rmSync (node:fs:1252:10)\n        at rmSync (C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\common\\tmpdir.js:31:8)\n        at onexit (C:\\workspace\\node-test-binary-windows-js-suites\\node\\test\\common\\tmpdir.js:65:5)\n        at process.\u003canonymous> (C:\\workspace\\node-tes...\n```\n\u003c/details>\n\nThese tests were introduced in https://github.com/nodejs/node/pull/58897","author":{"url":"https://github.com/joyeecheung","@type":"Person","name":"joyeecheung"},"datePublished":"2025-08-26T19:57:17Z","url":"https://github.com/nodejs/node/issues/59638"}