From: "byroot (Jean Boussier) via ruby-core" <ruby-core@...>
Date: 2023-12-06T08:02:09+00:00
Subject: [ruby-core:115601] [Ruby master Bug#20042] ObjectSpace finalizer can cause segfault

Issue #20042 has been updated by byroot (Jean Boussier).





Actually nevermind, my simplification was wrong. Using exactly your script, it crash all the way to 3.0.



```

:x: 3.0

���������<internal:gc>:35: [BUG] Stack consistency error (sp: 17, bp: 15)

ruby 3.0.5p211 (2022-11-24 revision ba5cf0f7c5) [x86_64-linux]

-- Control frame information -----------------------------------------------

c:0003 p:0011 s:0017 e:000014 METHOD <internal:gc>:35

c:0002 p:0060 s:0007 E:001af8 EVAL   -:10 [FINISH]

c:0001 p:0000 s:0003 E:002140 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------





:x: 3.1

<internal:gc>:34: warning: Exception in finalizer #<Finalizer:0x00007fc730f72e30>

-:2:in `call': wrong number of arguments (given 1, expected 0) (ArgumentError)

    from <internal:gc>:34:in `start'

    from -:10:in `<main>'

<internal:gc>:35:in `start': Stack consistency error (sp: 17, bp: 15) (fatal)



:x: 3.2

���������<internal:gc>:34: warning: Exception in finalizer #<Finalizer:0x00007fe950ab9d98>

-:2:in `call': wrong number of arguments (given 1, expected 0) (ArgumentError)

    from <internal:gc>:34:in `start'

    from -:10:in `<main>'

<internal:gc>:35: [BUG] Stack consistency error (sp: 17, bp: 15)





:x: 7e05e9ff94 (2023-12-06T06:48:55Z)

���������<internal:gc>:39: warning: Exception in finalizer #<Finalizer:0x00007fae4e314850>

-:2:in `call': wrong number of arguments (given 1, expected 0) (ArgumentError)

    from <internal:gc>:39:in `start'

    from -:10:in `<main>'

<internal:gc>:40: [BUG] Stack consistency error (sp: 17, bp: 15)



```



----------------------------------------

Bug #20042: ObjectSpace finalizer can cause segfault

https://bugs.ruby-lang.org/issues/20042#change-105531



* Author: ioquatix (Samuel Williams)

* Status: Open

* Priority: Normal

* Assignee: ko1 (Koichi Sasada)

* Backport: 3.0: DONTNEED, 3.1: REQUIRED, 3.2: REQUIRED

----------------------------------------

```ruby

class Finalizer

  def call # <- missing (id) argument

  end

end



object = Object.new

ObjectSpace.define_finalizer(object, Finalizer.new)

object = nil



GC.start # segfaults here

```







-- 

https://bugs.ruby-lang.org/

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