From: "nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@...>
Date: 2024-07-20T07:30:36+00:00
Subject: [ruby-core:118649] [Ruby master Bug#19781] Stack consistency error with tailcall and YJIT enabled

Issue #19781 has been updated by nagachika (Tomoyuki Chikanaga).

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

ruby_3_2 commit:2ac8e2049bad37da38576b1ed263713c66eba2c9 merged revision(s) commit:e1104017e3080fd432c0b5fdc3ae6e004ffd0834.

----------------------------------------
Bug #19781: Stack consistency error with tailcall and YJIT enabled
https://bugs.ruby-lang.org/issues/19781#change-109177

* Author: k0kubun (Takashi Kokubun)
* Status: Closed
* Assignee: yjit
* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: DONE
----------------------------------------
```rb
src = <<-EOS
  def apply_one_and_two(&block)
    [1, p(1)]
  end
���
  def add_one_and_two
    apply_one_and_two(&:+)
  end
EOS
���
RubyVM::InstructionSequence.new(
  "proc {|_|_.class_eval {#{src}}}",
  __FILE__, __FILE__, 1,
  tailcall_optimization: true,
  trace_instruction: false,
).eval[self.singleton_class]
���
def entry
  add_one_and_two
end
���
entry
```

This script causes "Stack consistency error" with `ruby --yjit-call-threshold=1` on any YJIT-enabled build (3.1, 3.2, and master).



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