[ruby-core:95884] [Ruby master Bug#16177] Some `*.rb` files on builddir cause Segmentation fault

Issue #16177 has been updated by ko1 (Koichi Sasada).


I fixed this issue, but no test. can anyone write it?

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Bug #16177: Some `*.rb` files on builddir cause Segmentation fault
https://bugs.ruby-lang.org/issues/16177#change-82720

* Author: znz (Kazuhiro NISHIYAMA)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-09-24T02:50:38Z master 2366c68116) [x86_64-darwin18]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
How to reproduce:

1. Create dummy files by `./miniruby -e '%w[a b foo bar test zzz].each{|basename|File.write("#{basename}.rb", "raise %(do not load #{basename}.rb)")}'` 
2. Run `ruby/test_autoload.rb` like `make test-all TESTS='ruby/test_autoload.rb'`

Error log from raw logs:

```
2019-09-24T09:48:24.3773590Z   2) Failure:
2019-09-24T09:48:24.3773760Z TestAutoload#test_autoload_same_file [/Users/runner/runners/2.158.0/work/ruby/ruby/test/ruby/test_autoload.rb:332]:
2019-09-24T09:48:24.3773930Z pid 39572 killed by SIGABRT (signal 6)
2019-09-24T09:48:24.3774450Z | #<Thread:0x00007f8851176ac0@-:9 run> terminated with exception (report_on_exception is true):
2019-09-24T09:48:24.3775010Z | /Users/runner/runners/2.158.0/work/ruby/ruby/b.rb:1:in `<top (required)>': do not load b.rb (RuntimeError)
2019-09-24T09:48:24.3775480Z | 	from -:9:in `require'
2019-09-24T09:48:24.3775910Z | 	from -:9:in `block in <main>'
2019-09-24T09:48:24.3776390Z | -:10: [BUG] Segmentation fault at 0x0000000000000019
```

attached full raw logs of https://github.com/ruby/ruby/pull/2482/checks?check_run_id=233890903#step:11:1 


---Files--------------------------------
36.txt (195 KB)
bug-in-docker.txt (14 KB)


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