[ruby-core:106377] [Ruby master Bug#18379] [CI] Windows mingw\ucrt - test-all timeout failures

Issue #18379 has been reported by MSP-Greg (Greg L).

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Bug #18379: [CI] Windows mingw\ucrt - test-all timeout failures
https://bugs.ruby-lang.org/issues/18379

* Author: MSP-Greg (Greg L)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0dev (2021-12-02T00:21:50Z master fe1725236c) [x64-mingw32]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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Recently there was another test-all timeout failure on a Windows mingw or ucrt job.  These are intermittent failures, and the last indicated that the test suite had passed.

See https://github.com/ruby/ruby/runs/4389116424?check_suite_focus=true#step:16:909

ruby-loco runs tests differently, but it has also had intermittent failures, which were due to a ruby process that wasn't closing, leaving a locked file (STDERR mapped to a file).

I added `Stop-Process -Name ruby -Force -ErrorAction SilentlyContinue` (PowerShell), which in Ruby's CI could be added right after the test-all line.

Again, this is intermittent. I haven't checked to see if it can be repro'd using the test seed value from a failing job.



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