Issue #13223 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.2: REQUIRED, 2.3: REQUIRED, 2.4: REQUIRED to 2.2: DONTNEED, 2.3: DONTNEED, 2.4: DONTNEED

Ugh, I have marked this as backport required for r57958, not r57960.
I'll create another ticket for r57958.

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Bug #13223: `File.join` will segv if File::SEPARATOR and File::Separator are set.
https://bugs.ruby-lang.org/issues/13223#change-63556

* Author: tenderlovemaking (Aaron Patterson)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0dev (2017-02-17 trunk 57648) [x86_64-darwin16]
* Backport: 2.2: DONTNEED, 2.3: DONTNEED, 2.4: DONTNEED
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The program below will crash with a segv:

~~~ruby
File.const_set :Separator, "hello"
File.const_set :SEPARATOR, "hello"

GC.start

File.join "hello", "world"
~~~

This is because the separator object is referenced from a global variable and setting the constants allows the object to be GC'd and the global will go bad.

I've attached a patch that contains a test to demonstrate the problem along with a fix.

---Files--------------------------------
0001-Fix-segv-in-File.join-when-SEPARATOR-and-Separator-a.patch (3.04 KB)


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