Rails 6 ActionPack tests cause StackOverflowError

[deepj]

When I run the whole Rails 6 ActionPack tests I got

truffleruby 1.0.0-rc17-dev-22c6a1c1, like ruby 2.6.2, GraalVM CE Native [x86_64-darwin]

Error:

Error during failsafe response: stack level too deep
	from StackOverflowCheckImpl.java:371:in `com.oracle.svm.core.graal.snippets.StackOverflowCheckSnippets.newStackOverflowError0'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:141:in `block in each_with_block'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:141:in `causes_for'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:145:in `each_with_block'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:145:in `each'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:145:in `collect'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:145:in `wrapped_causes_for'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:44:in `initialize'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:145:in `new'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:145:in `block in wrapped_causes_for'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:141:in `block in collect'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:141:in `block in each'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:141:in `block in each_with_block'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:141:in `causes_for'
  ~/dev/bugs/truffleruby/rails/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb:145:in `each_with_block'

The whole output is in this zip (it has ~215 MB after unpacking)
output.txt.zip

[deepj]

@eregon @chrisseaton can you take a look at the output because the big part comes from TruffleRuby.

[aardvark179]

This is being caused by the exception raising code incorrectly setting the exception's cause to itself if an exception is rethrown. The combination of debug and exception wrappers in the tests means exceptions are being rethrown, and their causes recursively traversed, and ends up with the stack overflow.

[aardvark179]

The fix for exception re-raising has now been merged into master