Ruby Issue Tracking System

11/13/2026

11:02 PM Ruby Bug #22547: `String.new("", encoding: Encoding::CESU_8)` fails the STR_EMBEDDABLE_P assertion “too big termlen: 6” on debug builds

346d1f63b7 only added the assertion. To find where the terminator length of 6 comes from, I added the same check to `STR_EMBEDDABLE_P` by hand and built the two commits around 14285dee21 ("Optimize `String.new(capacity:)`", https://githu... yahonda (Yasuo Honda)

11:01 PM Ruby Bug #22547 (Closed): `String.new("", encoding: Encoding::CESU_8)` fails the STR_EMBEDDABLE_P assertion “too big termlen: 6” on debug builds

The Rails nightly CI against Ruby master (debug build) started aborting in Active Support with `Assertion Failed: STR_EMBEDDABLE_P:termlen <= 4: too big termlen: 6`. It bisects to 346d1f63b7 ("Ignore negative capacity", https://github.co... yahonda (Yasuo Honda)

11/12/2026

09:53 AM Ruby Feature #14915: Deprecate String#crypt

Let me report a recent change in behaviour that is related to this ticket. I noticed it while investigating https://github.com/bcrypt-ruby/bcrypt-ruby/issues/305 , which appeared after the `rubylang/ruby` Docker images moved to Ubuntu 26... yahonda (Yasuo Honda)

10/08/2026

11:45 PM Ruby Bug #22419 (Closed): [BUG] "rb_objspace_reachable_objects_from_local: set is owned by another Ractor" when a non-main Ractor reads a class instance variable since f0439cdfa7

The Rails nightly CI against Ruby master started crashing with `[BUG] rb_objspace_reachable_objects_from_local: set is owned by another Ractor` in Action Pack and Action View on all of master, YJIT and master-debug. It bisects to f0439cd... yahonda (Yasuo Honda)

09/30/2026

05:26 PM Ruby Bug #22398 (Closed): `alias_method` over a bmethod fails `rb_vm_check_ints` assertion after a Ractor has been created

This issue is originally found at the Rails nightly CI with a debug build of Ruby. It started failing at https://buildkite.com/rails/rails-nightly/builds/4738#01a0ac05-212c-406d-bec7-190726eecc98 with ruby 4.1.0dev (2026-09-16T14:21:47Z ... yahonda (Yasuo Honda)

09/10/2026

02:03 AM Ruby Bug #22267: Active Support tests started failing on ruby master (bisected to [GH-18194])

Testing https://github.com/ruby/ruby/pull/18605 and confirmed 1 of 2 issues are resolved.
```
$ ruby -v
ruby 4.1.0dev (2026-09-02T22:07:39Z ractor_copy_serial.. cef58b42cf) +PRISM [x86_64-linux]
```
- 1 of 2 works successfully
... yahonda (Yasuo Honda)

08/27/2026

02:01 AM Ruby Bug #22173: `Ractor.new { Fiber.current }.value` raises `[BUG] rb_ractor_confirm_belonging object-ractor id:1, current-ractor id:2`

This assertion failure does not reproduce since https://github.com/ruby/ruby/commit/09aab7899fa0d0014e458c319e689175881a2075 so I think we can close it. yahonda (Yasuo Honda)

08/26/2026

08:22 AM Ruby Bug #22267 (Open): Active Support tests started failing on ruby master (bisected to [GH-18194])

On ruby-head, the Active Support (Rails) test suite fails with two Ractor-related errors (rails-nightly build 4651, https://buildkite.com/rails/rails-nightly/builds/4651#01a016ac-eada-492d-9548-44089079b973/L8324).
Rails CI failure. T... yahonda (Yasuo Honda)

12:38 AM Ruby Bug #22263: NoMethodError: super: no superclass method 'require' for main — raised in a forked child process after a Ractor has exited in the parent (bisected to c59c4d717a)

Correction on the bisect result. 98f0921f2b is where the forked RailtieTest children start to crash (SIGSEGV or ArgumentError), not where this NoMethodError starts. Bisecting for the NoMethodError itself, with the same bin/test command, ... yahonda (Yasuo Honda)

08/25/2026

03:17 PM Ruby Bug #22263 (Open): NoMethodError: super: no superclass method 'require' for main — raised in a forked child process after a Ractor has exited in the parent (bisected to c59c4d717a)

### 1. First occurrence in Rails CI
https://buildkite.com/rails/rails-nightly/builds/4651#01a016ac-eaf9-4a71-9fb6-1924c8a7b9af
(job "activemodel (master-debug)", 2026-08-18, ruby 4.1.0dev (2026-08-18T13:12:35Z master 6b719acc57) +PRI... yahonda (Yasuo Honda)