Surprised there isn't already an issue for this one. It's been happening a *lot* lately. I think it is only on the 32-bit Windows in CI. Here's an example: <!-- Thank you for reporting a flaky test. Flaky tests are tests that fail occasionally in the Node.js CI, but not consistently enough to block PRs from landing, or that are failing in CI jobs or test modes that are not run for every PR. Please fill in as much of the template below as you're able. Test: The test that is flaky - e.g. `test-fs-stat-bigint` Platform: The platform the test is flaky on - e.g. `macos` or `linux` Console Output: A pasted console output from a failed CI job showing the whole failure of the test Build Links: Links to builds affected by the flaky test If any investigation has been done, please include any information found, such as how consistently the test fails, whether the failure could be reproduced locally, when the test started failing, or anything else you think is relevant. --> * **Test**: test-child-process-exec-abortcontroller-promisified * **Platform**: Win2012r2 VS 2013 x64 (test-rackspace-win2012r2_vs2013-x64-1) * **Console Output:** ``` 00:29:58 not ok 72 parallel/test-child-process-exec-abortcontroller-promisified 00:29:58 --- 00:29:58 duration_ms: 0.174 00:29:58 severity: fail 00:29:58 exitcode: 1 00:29:58 stack: |- 00:29:58 node:internal/process/promises:245 00:29:58 triggerUncaughtException(err, true /* fromPromise */); 00:29:58 ^ 00:29:58 00:29:58 [AssertionError [ERR_ASSERTION]: post aborted sync signal failed] { 00:29:58 generatedMessage: false, 00:29:58 code: 'ERR_ASSERTION', 00:29:58 actual: Error: Command failed: TIMEOUT 120 00:29:58 ERROR: Input redirection is not supported, exiting the process immediately. 00:29:58 00:29:58 00:29:58 at ChildProcess.exithandler (node:child_process:326:12) 00:29:58 at ChildProcess.emit (node:events:378:20) 00:29:58 at maybeClose (node:internal/child_process:1067:16) 00:29:58 at Socket.<anonymous> (node:internal/child_process:453:11) 00:29:58 at Socket.emit (node:events:378:20) 00:29:58 at Pipe.<anonymous> (node:net:671:12) { 00:29:58 killed: false, 00:29:58 code: 1, 00:29:58 signal: null, 00:29:58 cmd: 'TIMEOUT 120', 00:29:58 stdout: '', 00:29:58 stderr: 'ERROR: Input redirection is not supported, exiting the process immediately.\r\n' 00:29:58 }, 00:29:58 expected: /AbortError/, 00:29:58 operator: 'rejects' 00:29:58 } 00:29:58 ... ``` * **Build Links**: https://ci.nodejs.org/job/node-test-binary-windows-js-suites/8580/RUN_SUBSET=0,nodes=win2012r2-COMPILED_BY-vs2019-x86/