From: "nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@...>
Date: 2026-05-09T06:27:09+00:00
Subject: [ruby-core:125445] [Ruby Bug#21880] The ultra_safe mode of pstore bundled with Ruby 4.0 is broken.

Issue #21880 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 3.2: WONTFIX, 3.3: DONE, 3.4: REQUIRED, 4.0: DONE to 3.2: WONTFIX, 3.3: DONE, 3.4: DONE, 4.0: DONE

ruby_3_4 commit:55f7432b303c70f2f0ee6fa4659f6a366292dc3e.

----------------------------------------
Bug #21880: The ultra_safe mode of pstore bundled with Ruby 4.0 is broken.
https://bugs.ruby-lang.org/issues/21880#change-117245

* Author: s3fxn (s3 fxn)
* Status: Closed
* ruby -v: 4.0
* Backport: 3.2: WONTFIX, 3.3: DONE, 3.4: DONE, 4.0: DONE
----------------------------------------
here is the reproduction code.

```console
$ ruby -v
ruby 4.0.1 (2026-01-13 revision e04267a14b) +PRISM [x86_64-linux]

$ cat pstore.rb 
```
```ruby
#!/usr/bin/env ruby
require "bundler/inline"
gemfile do
  source "https://rubygems.org"
  if ENV['DEBUG']
    gem "pstore", "0.1.4"
  else
    gem "pstore"
  end
end

db = PStore.new("pstore.db")
db.ultra_safe = true
db.transaction do
  puts db["now"] = Time.now
end
```
```console
$ ruby pstore.rb
2026-02-15 04:49:31 +0000
/home/s3fxn/.rubies/ruby-4.0.1/lib/ruby/gems/4.0.0/gems/pstore-0.2.0/lib/pstore.rb:676:in 'Ractor.make_shareable': Proc's self is not shareable: #<Proc:0x0000749f688df078 /home/s3fxn/.rubies/ruby-4.0.1/lib/ruby/gems/4.0.0/gems/pstore-0.2.0/lib/pstore.rb:673> (Ractor::IsolationError)
	from /home/s3fxn/.rubies/ruby-4.0.1/lib/ruby/gems/4.0.0/gems/pstore-0.2.0/lib/pstore.rb:676:in 'PStore#on_windows?'
	from /home/s3fxn/.rubies/ruby-4.0.1/lib/ruby/gems/4.0.0/gems/pstore-0.2.0/lib/pstore.rb:685:in 'PStore#save_data'
	from /home/s3fxn/.rubies/ruby-4.0.1/lib/ruby/gems/4.0.0/gems/pstore-0.2.0/lib/pstore.rb:575:in 'PStore#transaction'
	from pstore.rb:14:in '<main>'

$ DEBUG=1 ruby pstore.rb
2026-02-15 04:49:53 +0000
```





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