https://git.ruby-lang.org/ruby.git/commit/?id=9948addda6

From 9948addda67f4b7a6e3575f1eba9025f998811d2 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Sat, 18 Apr 2020 00:31:33 -0700
Subject: Skip a too-unstable test on s390x-linux

In the last 26-ish hours, it has failed 5 times:
https://travis-ci.org/github/ruby/ruby/jobs/676497718
https://travis-ci.org/github/ruby/ruby/jobs/676480295
https://travis-ci.org/github/ruby/ruby/jobs/676103216
https://travis-ci.org/github/ruby/ruby/jobs/676057967
https://travis-ci.org/github/ruby/ruby/jobs/676055113

and I don't think anybody has been working on it right now. To make CI
result report of s390x-linux useful, let's skip it until the test is
improved to be more stable.

diff --git a/test/ruby/test_fiber.rb b/test/ruby/test_fiber.rb
index 947e75a..f548024 100644
--- a/test/ruby/test_fiber.rb
+++ b/test/ruby/test_fiber.rb
@@ -360,6 +360,7 @@ class TestFiber < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_fiber.rb#L360
   end
 
   def test_stack_size
+    skip 'too unstable on Travis s390x-linux' if RUBY_PLATFORM == 's390x-linux'
     h_default = eval(invoke_rec('p RubyVM::DEFAULT_PARAMS', nil, nil, false))
     h_0 = eval(invoke_rec('p RubyVM::DEFAULT_PARAMS', 0, 0, false))
     h_large = eval(invoke_rec('p RubyVM::DEFAULT_PARAMS', 1024 * 1024 * 5, 1024 * 1024 * 10, false))
-- 
cgit v0.10.2


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