[ruby-core:106103] [Ruby master Bug#18343] empty hash passed to Array#pack causes Segmentation fault (2.6)

Issue #18343 has been updated by Ethan (Ethan -).


agreed that it's not a security issue, and questionable whether it's worth fixing for a version near EOL. I only encountered this during an early/flawed attempt at generic argument delegation to some Array methods, but that has been rewritten and this issue does not affect me. a segfault in a supported Ruby still seemed worth reporting, but not fine to close.

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Bug #18343: empty hash passed to Array#pack causes Segmentation fault (2.6)
https://bugs.ruby-lang.org/issues/18343#change-94692

* Author: Ethan (Ethan -)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.6.8p205 (2021-07-07 revision 67951) [x86_64-linux]
* Backport: 2.6: REQUIRED, 2.7: DONTNEED, 3.0: DONTNEED
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passing an empty hash to `Array#pack` segfaults from ruby 2.4 to ruby 2.6 on ubuntu, macos, and windows.

```ruby
[0].pack('c', {})
```

pack takes a keyword argument, and handles unknown keywords, but the empty hash segfaults.

here is the error trace in a github workflow running only the above expression: https://github.com/notEthan/jsi/runs/4226433638 (other ruby versions and OSes are part of the same run)




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