[ruby-core:115833] [Ruby master Bug#20076] M:N scheduler crashes on macOS with RUBY_MN_THREADS=1

Issue #20076 has been updated by jpcamara (JP Camara).


Originally I thought it was the kqueue MN PR, but it may have been the changes applied before it that are causing this. If I go back to the commit before kqueue was merged this issue is still occurring. If I go back here https://github.com/ruby/ruby/commit/28a6e4ea9d9379a654a8f7c4b37fa33aa3ccd0b7, right before the `rb_thread_io_blocking_call` commits, it starts working again. Maybe this is something you both already realized.

----------------------------------------
Bug #20076: M:N scheduler crashes on macOS with RUBY_MN_THREADS=1
https://bugs.ruby-lang.org/issues/20076#change-105787

* Author: hsbt (Hiroshi SHIBATA)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
This is known issue. I already shared this to ko1.

The version of https://github.com/ruby/ruby/commit/28e3886689c71b22487dd5d0cb62f3b5ed0a77cc is crashed with `make exam`.

This is happend with webrick test on `make test-tool`.

My environment is macOS Sonoma 14.3 beta1 and

```
$ pkgutil --pkg-info=com.apple.pkg.CLTools_Executables
package-id: com.apple.pkg.CLTools_Executables
version: 15.1.0.0.1.1700200546
volume: /
location: /
install-time: 1702331495
```






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