From: "nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@...>
Date: 2023-07-17T04:59:43+00:00
Subject: [ruby-core:114208] [Ruby master Bug#19595] YJIT: Crash from missing argc check in known cfuncs

Issue #19595 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED to 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONE

ruby_3_2 8852b4b2deea20f488208dc4730ef149f67d7594 merged revision(s) 0ce2bdc76dd17aa3d42a352a6244c87a51e7606d.

----------------------------------------
Bug #19595: YJIT: Crash from missing argc check in known cfuncs
https://bugs.ruby-lang.org/issues/19595#change-103895

* Author: jhawthorn (John Hawthorn)
* Status: Closed
* Priority: Normal
* Backport: 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONE
----------------------------------------
https://github.com/ruby/ruby/pull/7697

Previously we were missing a compile-time check that the known cfuncs receive the correct number of arguments.

```
$ ruby --yjit-call-threshold=1 -e '"foo".to_s(*[])'
ruby: YJIT has panicked. More info to follow...
thread '<unnamed>' panicked at 'assertion failed: `(left == right)`
  left: `1`,
 right: `2`', ./yjit/src/codegen.rs:7225:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
-e:1: [BUG] YJIT panicked
ruby 3.3.0dev (2023-04-08T18:54:01Z master 671cfc2000) +YJIT [x86_64-linux]
```

This likely needs a backport to Ruby 3.2, Ruby 3.1 does not have this bug



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