Bug #14179
Updated by dadah89 (Igor Justino) over 6 years ago
Hello, Delegating `backtrace` causes a segmentation fault on ruby 2.2.8. Seems to be related to this change: https://github.com/ruby/ruby/commit/a14ba6e3d58d6f63f47c0549f60306c4989478ba Looking at that change, seems like the `$@` call on line 207 would cause an infinite loop (assuming `$@` $@ would execute something similar `$!.backtrace`, $!.backtrace, but I'm not sure how `$@` $@ is implemented). Example: ``` irb(main):052:0> class WrappedException < StandardError irb(main):053:1> extend Forwardable irb(main):054:1> irb(main):055:1* def_delegators :@err, :backtrace irb(main):056:1> irb(main):057:1* def initialize(err) irb(main):058:2> @err = err irb(main):059:2> end irb(main):060:1> end => :initialize irb(main):061:0> irb(main):062:0* begin irb(main):063:1* raise WrappedException, StandardError.new('test') irb(main):064:1> rescue => e irb(main):065:1> e.backtrace irb(main):066:1> end Segmentation fault ``` ``` irb(main):031:0> class WrappedException < StandardError irb(main):032:1> extend Forwardable irb(main):033:1> irb(main):034:1* def_delegators :@err, :backtrace irb(main):035:1> irb(main):036:1* def initialize(err) irb(main):037:2> @err = err irb(main):038:2> end irb(main):039:1> end => :initialize irb(main):040:0> irb(main):041:0* begin irb(main):042:1* raise WrappedException, StandardError.new('test') irb(main):043:1> rescue => e irb(main):044:1> e.backtrace irb(main):045:1> end RuntimeError: can't modify frozen SystemStackError from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' ... 5481 levels... from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from /opt/.rbenv/versions/2.2.8/lib/ruby/2.2.0/forwardable.rb:207:in `backtrace' from (irb):44:in `rescue in irb_binding' from (irb):41 from /opt/.rbenv/versions/2.2.8/bin/irb:11:in `<main>' irb(main):046:0> ```