From: "byroot (Jean Boussier) via ruby-core" <ruby-core@...>
Date: 2023-08-01T18:32:09+00:00
Subject: [ruby-core:114329] [Ruby master Bug#19793] Segmentation fault with large arrays

Issue #19793 has been updated by byroot (Jean Boussier).


So instead of `99130.times { array << "a string"}` you can just add `GC.start` and it will also crash.

I also tested it's still failing on master. I'll see if this can be reduced.

----------------------------------------
Bug #19793: Segmentation fault with large arrays
https://bugs.ruby-lang.org/issues/19793#change-104031

* Author: sczimmer (Scott Zimmermann)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.2 (2023-03-30 revision e51014f9c0) [aarch64-linux]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
I was doing ruby koans to learn ruby and I got a segmentation fault when it gets to the part where it uses `Symbol.all_symbols`. I realized it happens with any large Array, but I cannot reproduce in a small test script, just when it runs the whole ruby koans. So the minimal way to reproduce I have is:

download rubykoans: https://github.com/edgecase/ruby_koans/blob/master/download/rubykoans.zip?raw=true
```
unzip rubykoans.zip
cd koans
# fix deprecated method call for ruby 3.2
ruby -i -pe 'sub "File.exists", "File.exist"' neo.rb
```

Edit about_asserts.rb, adding these two statements to make a big array to the first koan:
```
  def test_assert_truth
    array = []
    99130.times { array << "a string"}
    assert false                # This should be true
  end

```

run `ruby path_to_enlightenment.rb` and get a backtrace like the attached backtrace.txt
I've tried this on two servers, ubuntu aarch64 and debian x86_64. On both it crashes with ruby 3.2.2 and works fine with ruby 3.1. On both I installed ruby built from source with RVM. On the server with more ram I had to increase the number more (above it's 99130) to get it to crash.

---Files--------------------------------
backtrace.txt (21.7 KB)


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