From: peter@...
Date: 2020-08-11T20:02:31+00:00
Subject: [ruby-core:99561] [Ruby master Bug#17117] Corruption in ARGF.inplace

Issue #17117 has been reported by peterzhu2118 (Peter Zhu).

----------------------------------------
Bug #17117: Corruption in ARGF.inplace
https://bugs.ruby-lang.org/issues/17117

* Author: peterzhu2118 (Peter Zhu)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.8.0dev (2020-08-11T19:09:12Z inplace-str-corrup.. 16d72713d2) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Extension string stored in `ARGF.inplace` is created using an api designed for C string constants to create a Ruby string that points at another Ruby string. When the original string is swept, the extension string gets corrupted.

Reproduction script (on MacOS):

```ruby
#!/usr/bin/ruby -pi.bak

BEGIN {
  GC.start(full_mark: true)
  arr = []
  1000000.times do |x|
    arr << "fooo#{x}"
  end
}

puts "hello"
```

[Fix PR on GitHub](https://github.com/ruby/ruby/pull/3409)




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