[ruby-core:116135] [Ruby master Bug#20172] Socket.addrinfo failing randomly

Issue #20172 has been updated by mwaldvogel (Michael Waldvogel).


We can at least exclude that it is due to heavy load. I will provide you access to one of the vms by tomorrow. That way it should be easier to analyze.

----------------------------------------
Bug #20172: Socket.addrinfo failing randomly
https://bugs.ruby-lang.org/issues/20172#change-106141

* Author: mwaldvogel (Michael Waldvogel)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [x86_64-linux]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
I've recently updated one of my linux systems (Gentoo) to glibc 2.38 (that was the only change). After the update most of the time the below error happens. Among other things this breaks rubygems for me. I've reinstalled ruby 3.2.2 with rvm and didn't encounter the issue. The issue however remained even after reinstalling ruby 3.3.0 and even with ruby master. Since this goes back to getaddrinfo (which is working without any issues outside of ruby) and there seems to be only one bigger change to stdlib socket, I'm assuming the problem was introduced with https://bugs.ruby-lang.org/issues/19965

```
3.3.0 :001 > require 'socket'
 => true
3.3.0 :002 > Socket.getaddrinfo('rubygems.org', 443)
(irb):2:in `getaddrinfo': getaddrinfo: Temporary failure in name resolution (Socket::ResolutionError)
        from (irb):2:in `<main>'
        from <internal:kernel>:187:in `loop'
        from /usr/local/rvm/rubies/ruby-3.3.0/lib/ruby/gems/3.3.0/gems/irb-1.11.0/exe/irb:9:in `<top (required)>'
        from /usr/local/rvm/rubies/ruby-3.3.0/bin/irb:25:in `load'
        from /usr/local/rvm/rubies/ruby-3.3.0/bin/irb:25:in `<main>'
3.3.0 :003 > Socket.getaddrinfo('rubygems.org', 443)
(irb):3:in `getaddrinfo': getaddrinfo: Temporary failure in name resolution (Socket::ResolutionError)
        from (irb):3:in `<main>'
        from <internal:kernel>:187:in `loop'
        from /usr/local/rvm/rubies/ruby-3.3.0/lib/ruby/gems/3.3.0/gems/irb-1.11.0/exe/irb:9:in `<top (required)>'
        from /usr/local/rvm/rubies/ruby-3.3.0/bin/irb:25:in `load'
        from /usr/local/rvm/rubies/ruby-3.3.0/bin/irb:25:in `<main>'
3.3.0 :004 > Socket.getaddrinfo('rubygems.org', 443)
 =>
[["AF_INET", 443, "151.101.193.227", "151.101.193.227", 2, 1, 6],
 ["AF_INET", 443, "151.101.193.227", "151.101.193.227", 2, 2, 17],
 ["AF_INET", 443, "151.101.193.227", "151.101.193.227", 2, 3, 0],
...
 ["AF_INET6", 443, "2a04:4e42::483", "2a04:4e42::483", 10, 1, 6],
 ["AF_INET6", 443, "2a04:4e42::483", "2a04:4e42::483", 10, 2, 17],
 ["AF_INET6", 443, "2a04:4e42::483", "2a04:4e42::483", 10, 3, 0]]
3.3.0 :005 >
```



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