Issue #11750 has been updated by Nobuyoshi Nakada.

File bug-11750.log added
Description updated

By bisecting, it raises `SytemStackError` or segfaults since r51243.

~~~
* vm_core.h: remove blockprocval field from rb_proc_t and rb_binding_t.
  Instead of this field, mark given block in Proc at rb_env_t::env.
~~~

`Enumerator`, `Generator`, or `Yielder` may need more marking or write-barrier.

----------------------------------------
Bug #11750: SEGV with Enumerator, yield and proc.
https://bugs.ruby-lang.org/issues/11750#change-55148

* Author: Akira Tanaka
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0dev (2015-11-29 trunk 52789) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
I found SEGV as follows.

```
% cat z.rb 
def f
  Enumerator.new {|y|
    1000000.times {
      yield
      y.yield
    }
  }
end

def g
  x = proc {}
  f(&x)
end

e = g
e.each {}

% ./miniruby z.rb
(snip)
```


---Files--------------------------------
bug-11750.log (11.2 KB)


-- 
https://bugs.ruby-lang.org/