Bug #17117
Updated by peterzhu2118 (Peter Zhu) over 4 years ago
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)
# Reproduction
1. Assuming you have the above script in a file called `test.rb`.
2. Create a file called `foo.txt` with contents `foo`.
3. Run `ruby test.rb foo.txt`.
# Expected behaviour
`foo.txt` with contents `hello\nfoo` and `foo.txt.bak` with contents `foo`.
# Actual behavior
`foo.txt` with contents `hello\nfoo` and `foo.txto121` with contents `foo`.