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Bug #18084

Updated by ioquatix (Samuel Williams) 9 months ago

~~~ ruby 
 require 'json' 

 x = {}; x[:x] = x 

 JSON.dump(x) # => nil 
 JSON.dump(x) # => SIGILL 
 ~~~ 

 Results from our friendly all ruby bot: 

 ~~~ 
 :x: 1.8 
 -:1:in `require': no such file to load -- json (LoadError) 
     from -:1 
 exit: 1 

 
 :x: 1.9 
 /build-all-ruby/1.9.3-p551/lib/ruby/1.9.1/json/common.rb:216: stack level too deep (SystemStackError) 
 exit: 1 

 :x: 2.0 
 /build-all-ruby/2.0.0-p648/lib/ruby/2.0.0/json/common.rb:224: stack level too deep (SystemStackError) 
 exit: 1 

 :x: 2.1 
 /build-all-ruby/2.1.10/lib/ruby/2.1.0/json/common.rb:223: stack level too deep (SystemStackError) 
 exit: 1 

 :x: 2.2 
 /build-all-ruby/2.2.10/lib/ruby/2.2.0/json/common.rb:223:in `encode': stack level too deep (SystemStackError) 
     from /build-all-ruby/2.2.10/lib/ruby/2.2.0/json/common.rb:223:in `generate' 
     from /build-all-ruby/2.2.10/lib/ruby/2.2.0/json/common.rb:223:in `generate' 
     from /build-all-ruby/2.2.10/lib/ruby/2.2.0/json/common.rb:394:in `dump' 
     from -:5:in `<main>' 
 Show more 
 exit: 1 

 :x: 2.3 
 /build-all-ruby/2.3.8/lib/ruby/2.3.0/json/common.rb:224:in `encode': stack level too deep (SystemStackError) 
     from /build-all-ruby/2.3.8/lib/ruby/2.3.0/json/common.rb:224:in `generate' 
     from /build-all-ruby/2.3.8/lib/ruby/2.3.0/json/common.rb:224:in `generate' 
     from /build-all-ruby/2.3.8/lib/ruby/2.3.0/json/common.rb:395:in `dump' 
     from -:5:in `<main>' 
 Show more 
 exit: 1 

 :x: 2.4 
 /build-all-ruby/2.4.10/lib/ruby/2.4.0/json/common.rb:224:in `encode': stack level too deep (SystemStackError) 
     from /build-all-ruby/2.4.10/lib/ruby/2.4.0/json/common.rb:224:in `generate' 
     from /build-all-ruby/2.4.10/lib/ruby/2.4.0/json/common.rb:224:in `generate' 
     from /build-all-ruby/2.4.10/lib/ruby/2.4.0/json/common.rb:394:in `dump' 
     from -:5:in `<main>' 
 Show more 
 exit: 1 

 :x: 2.5 
 /build-all-ruby/2.5.8/lib/ruby/2.5.0/json/common.rb:224:in `generate': stack level too deep (SystemStackError) 
     from /build-all-ruby/2.5.8/lib/ruby/2.5.0/json/common.rb:224:in `generate' 
     from /build-all-ruby/2.5.8/lib/ruby/2.5.0/json/common.rb:394:in `dump' 
     from -:5:in `<main>' 
 exit: 1 

 :x: 2.6 
 /build-all-ruby/2.6.6/lib/ruby/2.6.0/json/common.rb:224:in `generate': stack level too deep (SystemStackError) 
     from /build-all-ruby/2.6.6/lib/ruby/2.6.0/json/common.rb:224:in `generate' 
     from /build-all-ruby/2.6.6/lib/ruby/2.6.0/json/common.rb:394:in `dump' 
     from -:5:in `<main>' 
 exit: 1 

 :x: 2.7 -- 58bd943436 (2021-08-17T17:25:19Z) 
 -: machine stack overflow in critical region (fatal) 
 exit: 1 
 ~~~ 

 So in the best case, we got `SystemStackError`, and from 2.7+ we get a fatal error. 

 Do we want to improve this behaviour or is this expected, and if so, should we add documentation to this effect?

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