Ruby Issue Tracking System

12/18/2025

06:39 PM Ruby Bug #21790: `Socket.getaddrinfo` hangs after `fork()` on macOS 26.1 (Tahoe) for IPv4-only hosts

Ah my earlier Python script had a bug.
My initial Python test incorrectly reported success. The script used `os.WEXITSTATUS()` to check the child's exit status, but this function only works for processes that exit normally. When a pro... adamoffat (Adam Moffat)

03:44 PM Ruby Bug #21790: `Socket.getaddrinfo` hangs after `fork()` on macOS 26.1 (Tahoe) for IPv4-only hosts

mame (Yusuke Endoh) wrote in #note-3:
> Thank you for the report.
> ...
Ah yes, sorry I should have clarified this in my post. I tested this in 3.2.6 but it manifests differently in that version.
When I ran the same reproduction script ... adamoffat (Adam Moffat)

12/17/2025

11:35 PM Ruby Bug #21790: `Socket.getaddrinfo` hangs after `fork()` on macOS 26.1 (Tahoe) for IPv4-only hosts

I saw that this was added in 3.4.0: https://github.com/ruby/ruby/pull/10864
Seen here: (https://github.com/ruby/ruby/releases/tag/v3_4_0_preview2)
But I also tested this using 3.4.1 and it was still an issue. adamoffat (Adam Moffat)

11:08 PM Ruby Bug #21790: `Socket.getaddrinfo` hangs after `fork()` on macOS 26.1 (Tahoe) for IPv4-only hosts

To confirm: MacOS Sequoia also did not have this issue. adamoffat (Adam Moffat)

06:03 PM Ruby Bug #21790 (Open): `Socket.getaddrinfo` hangs after `fork()` on macOS 26.1 (Tahoe) for IPv4-only hosts

Ruby's `Socket.getaddrinfo` hangs indefinitely in forked child processes on macOS 26.1 (Tahoe) when resolving IPv4-only hostnames. This is a regression that does not occur on macOS 15.x (Sonoma) or earlier.
**Ruby version:**
ruby 3.3... adamoffat (Adam Moffat)