Bug #9063: irb crashes when #backtrace of raised Exception is nil

• Status: Closed
• Assignee: keiju (Keiju Ishitsuka)
• Target version: -
• ruby -v: ruby 2.1.0dev (2013-10-30 trunk 43474) [x86_64-darwin13.0.0]
• Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

[makimoto (Shimpei Makimoto)]

=begin
See also the pull req on GitHub: https://github.com/ruby/ruby/pull/434

When an exception whose backtrace is nil is raised, irb crashes and exits with the following backtrace:

irb> class E < Exception; def backtrace; nil; end; end
irb> raise E
E: E
/Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb.rb:502:in block (2 levels) in eval_input': undefined method []' for nil:NilClass (NoMethodError)
from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb.rb:624:in signal_status' from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb.rb:489:in block in eval_input'
from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb/ruby-lex.rb:247:in block (2 levels) in each_top_level_statement' from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb/ruby-lex.rb:233:in loop'
from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb/ruby-lex.rb:233:in block in each_top_level_statement' from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb/ruby-lex.rb:232:in catch'
from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb/ruby-lex.rb:232:in each_top_level_statement' from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb.rb:488:in eval_input'
from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb.rb:397:in block in start' from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb.rb:396:in catch'
from /Users/makimoto/.rbenv/versions/trunk/lib/ruby/2.1.0/irb.rb:396:in start' from /Users/makimoto/.rbenv/versions/trunk/bin/irb:11:in '

=end

[sorah (Sorah Fukumori)]

• Status changed from Open to Assigned
• Assignee set to keiju (Keiju Ishitsuka)

+1, I think irb shouldn't die even if caught Exception is something wrong.

Could you attach a patch for here too?

[makimoto (Shimpei Makimoto)]

• File irb-when-backtrace-nil.patch irb-when-backtrace-nil.patch added

attached a patch. (which is same with https://github.com/ruby/ruby/pull/434.patch )

[sorah (Sorah Fukumori)]

ping?

[hsbt (Hiroshi SHIBATA)]

• Status changed from Assigned to Closed
• % Done changed from 0 to 100

Applied in changeset r47164.

---

• lib/irb.rb: Prevent irb from crashing when exception with
  nil backtrace is raised.
  [fix GH-434][ruby-core:58078][Bug #9063]
• test/irb/test_raise_no_backtrace_exception.rb: ditto.