Issue #13555 has been reported by ko1 (Koichi Sasada).

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Bug #13555: Disable TestTrace#test_trace_stackoverflow
https://bugs.ruby-lang.org/issues/13555

* Author: ko1 (Koichi Sasada)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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I'll disable `TestTrace#test_trace_stackoverflow` because this test stops sometimes on several machines.

My observation: during stackoverflow throw process, it get another stackoverflow and repeat it.

I'll simply remove it and remain the code here.

```
  def test_trace_stackoverflow
    assert_normal_exit("#{<<-"begin;"}\n#{<<~"end;"}", timeout: 60)
    begin;
      require 'timeout'
      require 'tracer'
      class HogeError < StandardError
        def to_s
          message.upcase        # disable tailcall optimization
        end
      end
      Tracer.stdout = open(IO::NULL, "w")
      begin
        Timeout.timeout(5) do
          Tracer.on
          HogeError.new.to_s
        end
      rescue Timeout::Error
        # ok. there are no SEGV or critical error
      rescue SystemStackError => e
        # ok.
      end
    end;
  end
```




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