[ruby-core:119934] [Ruby master Bug#20895] Network related test failures

Issue #20895 has been reported by vo.x (Vit Ondruch).

----------------------------------------
Bug #20895: Network related test failures
https://bugs.ruby-lang.org/issues/20895

* Author: vo.x (Vit Ondruch)
* Status: Open
* ruby -v: ruby 3.4.0dev (2024-11-14 master 54ff9d3525) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Testing recent Ruby in Fedora Rawhide, I have started to observe following errors:

~~~
183) Failure:
TestSocket_TCPSocket#test_initialize_resolv_timeout_with_connection_failure [/builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:284]:
[Errno::ETIMEDOUT] exception expected, not #<Errno::ECONNREFUSED: Connection refused - connect(2) for "localhost" port 41615>.

184) Failure:
TestSocket_TCPSocket#test_initialize_with_hostname_resolution_failure_after_connection_failure [/builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:303]:
[Socket::ResolutionError] exception expected, not #<Errno::ECONNREFUSED: Connection refused - connect(2) for "localhost" port 43017>.

185) Failure:
TestNetHTTP_v1_2#test_timeout_during_HTTP_session [/builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/net/http/test_http.rb:625]:
[Net::ReadTimeout] exception expected, not #<Errno::ECONNREFUSED: Failed to open TCP connection to localhost:43017 (Connection refused - connect(2) for "localhost" port 43017)>.

186) Error:
TestSocket_TCPSocket#test_initialize_v6_hostname_resolution_failed_and_v4_hostname_resolution_is_success:
Socket::ResolutionError: getaddrinfo(3): Non-recoverable failure in name resolution
    /builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:266:in 'TCPSocket#initialize'
    /builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:266:in 'IO.new'
    /builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:266:in '<main>'
    /builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:259:in 'TestSocket_TCPSocket#test_initialize_v6_hostname_resolution_failed_and_v4_hostname_resolution_is_success'

187) Error:
TestSocket_TCPSocket#test_initialize_v6_hostname_resolved_earlier_and_v6_server_is_not_listening:
Errno::ECONNREFUSED: Connection refused - connect(2) for "localhost" port 39421
    /builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:222:in 'TCPSocket#initialize'
    /builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:222:in 'IO.new'
    /builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:222:in '<main>'
    /builddir/build/BUILD/ruby-3.4.0_20241114git54ff9d3525-build/ruby-3.4.0-54ff9d3525/test/socket/test_tcp.rb:213:in 'TestSocket_TCPSocket#test_initialize_v6_hostname_resolved_earlier_and_v6_server_is_not_listening'
~~~

Please note that the build system does not have internet access.

At least some of the test failures are likely related to #20782 / https://github.com/ruby/ruby/pull/11653



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