From: "alanwu (Alan Wu) via ruby-core" <ruby-core@...>
Date: 2025-04-13T13:20:13+00:00
Subject: [ruby-core:121642] [Ruby Bug#21266] YJIT GC safety crash with proc objects as block argument

Issue #21266 has been reported by alanwu (Alan Wu).

----------------------------------------
Bug #21266: YJIT GC safety crash with proc objects as block argument
https://bugs.ruby-lang.org/issues/21266

* Author: alanwu (Alan Wu)
* Status: Open
* Assignee: yjit
* Backport: 3.2: DONTNEED, 3.3: REQUIRED, 3.4: REQUIRED
----------------------------------------
```ruby
# Run with --yjit-call-threshold=1
def foo(args) = bar(*args, &proc { _1 })
def bar(_, _, _, _, *rest) = yield rest

GC.stress = true
foo([1,2,3,4])
foo([1,2,3,4])
```

The proc in these calls get collected on the yield to the GC to allocate the rest parameter arary.

```
../vm_core.h:1668: Assertion Failed: vm_block_handler_type:rb_obj_is_proc(block_handler)
```

Or in release builds:

```
../test.rb:1: [BUG] Segmentation fault at 0x0000000000000020
ruby 3.3.6 (2024-11-05 revision 75015d4c1f) +YJIT [arm64-darwin24]

-- C level backtrace information -------------------------------------------
/Users/alan/.rubies/ruby-3.3.6/bin/ruby(rb_vm_bugreport+0xb4c) [0x104595590]
/Users/alan/.rubies/ruby-3.3.6/bin/ruby(rb_bug_for_fatal_signal+0x100) [0x1043d6120]
/Users/alan/.rubies/ruby-3.3.6/bin/ruby(sig_do_nothing+0x0) [0x1044fc4b0]
/usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x187572de4]
/Users/alan/.rubies/ruby-3.3.6/bin/ruby(rb_vm_invokeblock+0x144) [0x10456b004]
```



-- 
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