Issue #17581 has been updated by jeremyevans0 (Jeremy Evans).

Assignee set to jeremyevans0 (Jeremy Evans)
Status changed from Open to Assigned

Agreed, it does look likely to be related to the commit.  I'll see if I can debug and fix the issue.

----------------------------------------
Bug #17581: Ruby 3.0 backtrace sometimes returns empty array
https://bugs.ruby-lang.org/issues/17581#change-90091

* Author: HParker (Adam Hess)
* Status: Assigned
* Priority: Normal
* Assignee: jeremyevans0 (Jeremy Evans)
* ruby -v: ruby 3.0.0dev (2020-09-04T16:41:35Z master de30450d91) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
```ruby
class Foo
  def bar
    p caller(1,1)
  end
end
[Foo.new].group_by(&:bar)
```

3.0: []

2.7: ["test2.rb:6:in `each'"]

A similar thing happens when asking for a larger part of the backtrace:

```ruby
class Foo
  def bar
    p caller(0,4)
  end
end
[Foo.new].group_by(&:bar)
```

3.0: ["test2.rb:3:in `bar'", "test2.rb:6:in `each'", "test2.rb:6:in `group_by'"]

2.7: ["test2.rb:3:in `bar'", "test2.rb:6:in `each'", "test2.rb:6:in `group_by'", "test2.rb:6:in `<main>'"]

I suspect it was introduced by: https://github.com/ruby/ruby/commit/3b24b7914c16930bfadc89d6aff6326a51c54295
Since it seems to have to do with which frames are returned, though I haven't verified since the commit is difficult to revert.



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