Issue #16920 has been reported by jaruga (Jun Aruga).

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Bug #16920: TestThread#test_signal_at_join fails on aarch64
https://bugs.ruby-lang.org/issues/16920

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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I observed the following error on Ruby 2.7.1 building in Fedora aarch64 CI. It was just one time error. It does not always happen.

```
  1) Error:
TestThread#test_signal_at_join:
Timeout::Error: execution of assert_separately expired timeout (120 sec)
pid 2314088 killed by SIGABRT (signal 6) (core dumped)
| 
    /builddir/build/BUILD/ruby-2.7.1/test/ruby/test_thread.rb:1346:in `test_signal_at_join'
Finished tests in 1379.712832s, 15.2372 tests/s, 1972.9127 assertions/s.
```




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