Bug #14179
closed
Forwardable Segmentation fault ruby 2.2.8p477 (2017-09-14 revision 59906)
Description
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, 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> 
Updated by dadah89 (Igor Justino) almost 8 years ago
- Description updated (diff)
Updated by dadah89 (Igor Justino) over 7 years ago
Bump. Issue still seems to happen on ruby 2.2.9.
Following https://bugs.ruby-lang.org/projects/ruby/wiki/HowToReport, I'm supposed to assign the ticket to the maintainer ( https://github.com/ruby/ruby/blob/trunk/doc/maintainers.rdoc mentions lib/forwardable.rb being maintained by Keiju ISHITSUKA (keiju)), but I don't see a way to assign tickets. Maybe the documentation is a bit outdated?
Updated by wanabe (_ wanabe) over 7 years ago
I guess this issue will be fixed to backport r55372.
But Ruby 2.2 status is "security maintenance" and its EOL date is scheduled for 2018-03-31.
https://www.ruby-lang.org/en/downloads/branches/
So ruby_2_2 branch would not backport but I wish ruby_2_3 would do.
You can avoid the issue with Ruby 2.4 or higher because they already include r55372.
Updated by nobu (Nobuyoshi Nakada) over 7 years ago
- Status changed from Open to Closed
- Backport changed from 2.3: UNKNOWN, 2.4: UNKNOWN to 2.3: REQUIRED, 2.4: DONTNEED, 2.5: DONTNEED
Updated by usa (Usaku NAKAMURA) over 7 years ago
- Backport changed from 2.3: REQUIRED, 2.4: DONTNEED, 2.5: DONTNEED to 2.3: DONE, 2.4: DONTNEED, 2.5: DONTNEED
ruby_2_3 r62820 merged revision(s) 55372.