Segmentation fault on MacOS after upgrading to Ruby v4.0.0

[collimarco]

Everything works fine with Ruby 3.4.x and previous versions, but when you upgrade to Ruby v4.0.0 this gems starts crashing immediately.

$ bundle exec rake solid_queue:start
/Users/myuser/.rbenv/versions/4.0.0/lib/ruby/gems/4.0.0/gems/pg-1.6.3-x86_64-darwin/lib/pg/connection.rb:944: [BUG] Segmentation fault at 0x00000001008c8b08
ruby 4.0.0 (2025-12-25 revision 553f1675f3) +YJIT +PRISM [x86_64-darwin24]
...

[larskanis]

Maybe the same issue as in #663?

[collimarco]

@larskanis

Not the same issue. I get the error only in Ruby v4.0, not in previous Ruby versions.

I get segfaults unless I disable spring, or set OBJC_DISABLE_INITIALIZE_FORK_SAFETY

I already tried both the solutions suggested in the other issue, but they don't solve this issue.

[collimarco]

Updating Ruby from v4.0.0 to v4.0.1 (just released) seems to fix this issue.