From: ujihisa@...
Date: 2018-04-10T12:55:48+00:00
Subject: [ruby-core:86490] [Ruby trunk Bug#14566] `raise` in `Exception#message` causes infinite loop

Issue #14566 has been updated by ujihisa (Tatsuhiro Ujihisa).

File fix-bug-14566.patch added

I tried making a patch fixing this issue. See attached.
This patch makes the behaviour similar to the old Ruby, rescuing any exceptions in the "message" method, but also warns that an exception was automatically caught.


I'm not 100% sure if this is the solution that everyone wants. Also the test in the patch needs an update; I wan't sure how to make sure if it's not causing infinite loop. I just left a draft as a comment there.

----------------------------------------
Bug #14566: `raise` in `Exception#message` causes infinite loop
https://bugs.ruby-lang.org/issues/14566#change-71437

* Author: pocke (Masataka Kuwabara)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-03-01 trunk 62592) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
This code does not stop. 


```ruby
class A < StandardError
  def message
    raise
  end
end

raise A
```

The following code also does not stop.


```ruby
class A < StandardError
  def message
    1/0
  end
end

raise A
```

And they ignore CTRL-C, so I should do CTRL-Z (suspend) and `kill -9` to stop them.



I confirmed the problem in Ruby 2.5 and trunk.

```
$ ruby -v
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-linux]

$ ruby -v
ruby 2.6.0dev (2018-03-01 trunk 62592) [x86_64-linux]
```

But Ruby 2.4 and 2.3 do not stop (I does not have Ruby 2.2 because I cannot build it in my environment.).
I can get same outputs between `raise` and `1/0` in the `message` method body.

```
$ ruby -v test.rb
ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-linux]
test.rb:7:in `<main>': A

$ ruby -v test.rb
ruby 2.3.6p384 (2017-12-14 revision 61254) [x86_64-linux]
test.rb:7:in `<main>': A
```

---Files--------------------------------
fix-bug-14566.patch (1.75 KB)


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