Ruby Issue Tracking System

09/18/2026

04:27 AM Ruby Bug #22334 (Closed): Assertion Failed: VM_ENV_FLAGS:FIXNUM_P(flags)

The following code:
```ruby
def r; return **[nil]; end; r()
```
Resulted in this output:
```
../vm_core.h:1554: Assertion Failed: VM_ENV_FLAGS:FIXNUM_P(flags)
ruby 4.1.0dev (2026-09-15T05:36:12Z master 3296d5c99c) +PRISM [x86_... 0599jiangyc@gmail.com (Yuancheng Jiang)

04:14 AM Ruby Bug #22333 (Closed): Assertion Failed: ary_resize_capa:RARRAY_LEN(ary) <= capacity

The following program:
```ruby
def assert_raise(*a) = (yield rescue nil)
MIN_SIZE = ENV.fetch('SMALL_ARRAY_MIN', 0).to_i
MAX_SIZE = ENV.fetch('SMALL_ARRAY_MAX', 16).to_i
ITERATIONS = ENV.fetch('SMALL_ARRAY_ITERATIONS', 100).to_i
... 0599jiangyc@gmail.com (Yuancheng Jiang)

09/16/2026

04:20 AM Ruby Bug #22322 (Closed): AddressSanitizer: use-after-poison in econv_description /ruby-src/build/../transcode.c

The following program:
```ruby
ec = Encoding::Converter.new("", "xml_attr_content_escape")
begin ec.dup.freeze; ec.clone(freeze: false); GC.start(full_mark: true, immediate_sweep: true); ObjectSpace.each_object(ec.class).first(50).e... 0599jiangyc@gmail.com (Yuancheng Jiang)

04:16 AM Ruby Bug #22321 (Closed): Assertion Failed: rb_vm_search_method_slowpath:RB_TYPE_2_P(klass, RUBY_T_CLASS, RUBY_T_ICLASS): klass: T_MODULE

The following program:
```ruby
def assert_equal(*a) = nil
bug15629_m1 = Module.new do
def foo; end
end
bug15629_m2 = Module.new do
def foo; end
end
bug15629_c = Class.new do
include bug15629_m1
include bug15629_m2
e... 0599jiangyc@gmail.com (Yuancheng Jiang)