Issue #13043 has been updated by Usaku NAKAMURA.
Backport changed from 2.1: REQUIRED, 2.2: DONE, 2.3: REQUIRED to 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED
... but reverted in `ruby_2_2` because it causes SEGV.
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Bug #13043: Exception#cause can become recursive/infinite
https://bugs.ruby-lang.org/issues/13043#change-62285
* Author: Cody Cutrer
* Status: Closed
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin16]
* Backport: 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED
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In a certain situation, Exception#cause can become an infinite list:
```ruby
def raise_errors
begin
raise "error 1"
ensure
orig_error = $!
begin
raise "error 2"
rescue => err
raise orig_error || err
end
end
end
x = nil
begin
raise_errors
rescue
x = $!
end
x.cause.cause.object_id == x.object_id
```
Note that this pattern happened during an HTTP request with net/http: see https://github.com/ruby/ruby/blob/v2_3_1/lib/net/http/response.rb#L261. I would expect that x would be "error 2", x.cause would be "error 1", and x.cause.cause would be nil. Instead an infinite loop forms, breaking error reporting code that loops over an exception's cause
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