[ruby-core:116166] [Ruby master Bug#20172] Socket.addrinfo failing randomly

Issue #20172 has been updated by mame (Yusuke Endoh).


I investigated the issue by using the VM access Michael gave me. (Thank you!) And I understand the issue.

It looks like `sched_getcpu(3)` returns an unexpected number in the environment. Since the number of CPUs in the VM is 2, I expect it to return 0 or 1. However, it actually returns 0 or *123*. This makes `pthread_create` fail with EINVAL because of a wrong affinity configuration.

TBH, I don't know why `sched_getcpu(3)` returns a strange value, but I guess it may depend on the configuration of the virtual environment.

I decided to remove the setaffinity mechanism and confirmed that it solves the issue: https://github.com/ruby/ruby/pull/9479
I introduced the mechanism to reduce the overhead of thread context switch, but a quick benchmark showed that removing it didn't seem to degrade the performance. So I'd like to simply delete the troublesome code.

----------------------------------------
Bug #20172: Socket.addrinfo failing randomly
https://bugs.ruby-lang.org/issues/20172#change-106174

* 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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