[ruby-core:104148] [Ruby master Bug#17926] spec/ruby/core/file/atime_spec.rb: a random failing test on Travis ppc64le

Issue #17926 has been updated by jaruga (Jun Aruga).


> Note that this failure was observed 4 days ago, at the build no #43628 - job number 509310540 first as far as I know. Since then, the failure rate is 4/35 = 11% so far.

Ah. No. The 11% is not correct. Skipping the 4 builds after my PR to skip the failure in the past builds, the failure rate is 4/31 = 12% in the term.

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Bug #17926: spec/ruby/core/file/atime_spec.rb: a random failing test on Travis ppc64le
https://bugs.ruby-lang.org/issues/17926#change-92320

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
I just observed the following test failing randomly on Travis ppc64le at the commit:fd65ef2a5aa8629676d1edb6410e4d4cf60b8045. When running this commit on my forked repo, the test passed.

https://travis-ci.com/github/ruby/ruby/jobs/509310540#L2255

```
$ $SETARCH make -s test-spec MSPECOPT=-ff
...
1)
File.atime returns the last access time for the named file with microseconds FAILED
Expected 0 == 123456
to be truthy but was false
/home/travis/build/ruby/ruby/spec/ruby/core/file/atime_spec.rb:25:in `block (3 levels) in <top (required)>'
/home/travis/build/ruby/ruby/spec/ruby/core/file/atime_spec.rb:3:in `<top (required)>'
```




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