From: "eiskrenkov (Egor Iskrenkov) via ruby-core" <ruby-core@...>
Date: 2025-09-08T17:02:01+00:00
Subject: [ruby-core:123189] [Ruby Bug#21565] YJIT has panicked in rails

Issue #21565 has been reported by eiskrenkov (Egor Iskrenkov).

----------------------------------------
Bug #21565: YJIT has panicked in rails
https://bugs.ruby-lang.org/issues/21565

* Author: eiskrenkov (Egor Iskrenkov)
* Status: Open
* ruby -v: ruby 3.4.5 (2025-07-16 revision 20cda200d3) +PRISM [arm64-darwin24]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
I've got YJIT has panicked crash in rails app locally on my M1 Pro Mac Book pro for 2 times for last 2 weeks

```
Started GET "/api/admin/environments/13/edit" for ::1 at 2025-09-08 18:32:17 +0200
Processing by Api::Admin::EnvironmentsController#edit as JSON
  Parameters: {"id" => "13", "environment" => {}}
ruby: YJIT has panicked. More info to follow...

thread '<unnamed>' panicked at ./yjit/src/codegen.rs:5031:9:
assertion failed: !val_type.is_imm()
stack backtrace:
   0: _rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::panic
   3: yjit::codegen::jit_guard_known_klass
   4: yjit::codegen::gen_equality_specialized
   5: yjit::codegen::gen_opt_eq
   6: yjit::codegen::gen_single_block
   7: yjit::core::gen_block_series
   8: yjit::core::branch_stub_hit_body
   9: yjit::stats::with_compile_time
  10: yjit::cruby::with_vm_lock
  11: yjit::core::branch_stub_hit
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
/Users/eiskrenkov/.local/share/mise/installs/ruby/3.4.5/lib/ruby/gems/3.4.0/gems/actionpack-8.0.2.1/lib/action_dispatch/request/session.rb:118: [BUG] YJIT: panicked at ./yjit/src/codegen.rs:5031:9:
assertion failed: !val_type.is_imm()
ruby 3.4.5 (2025-07-16 revision 20cda200d3) +YJIT +PRISM [arm64-darwin24]
```

It happens randomly, I couldn't find reproduction steps sadly

---Files--------------------------------
ruby-2025-09-08-183231.ips (45.3 KB)


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