** Description changed:
The autopkgtests for jruby fail `mri-extra` with the following errors:
1) Failure:
TestOpen3#test_pipeline_start
[/tmp/autopkgtest.Dz4xQk/autopkgtest_tmp/test/mri/test_open3.rb:303]:
Failed assertion, no message given.
2) Failure:
TestOpen3#test_pipeline_w
[/tmp/autopkgtest.Dz4xQk/autopkgtest_tmp/test/mri/test_open3.rb:288]:
<true> expected but was
<false>.
3) Failure:
TestOpen3#test_capture3_flip
[/tmp/autopkgtest.Dz4xQk/autopkgtest_tmp/test/mri/test_open3.rb:190]:
The minimal reproducer of those:
----
require 'open3'
RUBY = 'jruby'
Open3.pipeline_r([RUBY, '-e', 'print "1"'],
[RUBY, '-e', 'print STDIN.read + "2"']) {|o,ts|
print(o.read)
}
---
executing the above sample results in the following output:
# jruby test.rb
12# jruby test.rb
12# jruby test.rb
12# jruby test.rb
12# jruby test.rb
2# jruby test.rb
12# jruby test.rb
2# jruby test.rb
12# jruby test.rb
2# jruby test.rb
2# jruby test.rb
2# jruby test.rb
2# jruby test.rb
12# jruby test.rb
12# jruby test.rb
2Errno::EPIPE: Broken pipe - <STDOUT>
write at org/jruby/RubyIO.java:1569
write at org/jruby/RubyIO.java:1458
write at org/jruby/RubyIO.java:2829
print at org/jruby/RubyIO.java:1831
print at org/jruby/RubyKernel.java:649
<main> at -e:1
Note: the failure occurs both with Java 21
+ The root cause is that pipes are created non-blocking with Java 21.
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https://bugs.launchpad.net/bugs/2054943
Title:
jruby: mri-extra - flaky TestOpen3 pipe tests
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