Segmentation fault with ruby 2.6.0dev

[yahonda]

While investigating rails/rails#32339 it looks like related to CRuby and/or bootsnap. Then I would like to see how bootsnap unit test is running with Ruby 2.6.0 dev.

It gets segmetnation fault as below:

$ ruby -v
ruby 2.6.0dev (2018-03-28 trunk 63008) [x86_64-linux]

$ rake
install -c tmp/x86_64-linux/bootsnap/2.6.0/bootsnap.so lib/bootsnap/bootsnap.so
cp tmp/x86_64-linux/bootsnap/2.6.0/bootsnap.so tmp/x86_64-linux/stage/lib/bootsnap/bootsnap.so
$ bundle exec bin/testunit
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/return_values.rb:19: warning: mismatched indentations at 'when' with 'case' at 18
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/return_values.rb:20: warning: mismatched indentations at 'when' with 'case' at 18
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/return_values.rb:21: warning: mismatched indentations at 'else' with 'case' at 18
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/yield_parameters.rb:15: warning: mismatched indentations at 'when' with 'case' at 14
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/yield_parameters.rb:16: warning: mismatched indentations at 'when' with 'case' at 14
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/yield_parameters.rb:17: warning: mismatched indentations at 'else' with 'case' at 14
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:23: warning: mismatched indentations at 'when' with 'case' at 22
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:24: warning: mismatched indentations at 'else' with 'case' at 22
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:82: warning: mismatched indentations at 'when' with 'case' at 81
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:83: warning: mismatched indentations at 'when' with 'case' at 81
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:84: warning: mismatched indentations at 'when' with 'case' at 81
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:85: warning: mismatched indentations at 'else' with 'case' at 81
Run options: --seed 46415

# Running:

...../home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/object_methods.rb:79: [BUG] Segmentation fault at 0x00005621f0023338
ruby 2.6.0dev (2018-03-28 trunk 63008) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0027 p:---- s:0151 e:000150 CFUNC  :caller
c:0026 p:0053 s:0147 e:000144 BLOCK  /home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/object_methods.rb:79
c:0025 p:0032 s:0139 e:000138 METHOD /home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/argument_iterator.rb:15
c:0024 p:0108 s:0134 e:000133 METHOD /home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/object_methods.rb:74
Segmentation fault (core dumped)
$ uname -r
4.13.0-25-generic
$

[rafaelfranca]

Is this not a problem in Ruby?

[yahonda]

I guess it is due to some Ruby change but was not sure. Let me report to https://bugs.ruby-lang.org .

[yahonda]

Opened https://bugs.ruby-lang.org/issues/14653

[yahonda]

Closed since it has been reported that it has been addressed by https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/63040/

I did validate by using revision 63108.

$ bundle exec bin/testunit
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/return_values.rb:19: warning: mismatched indentations at 'when' with 'case' at 18
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/return_values.rb:20: warning: mismatched indentations at 'when' with 'case' at 18
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/return_values.rb:21: warning: mismatched indentations at 'else' with 'case' at 18
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/yield_parameters.rb:15: warning: mismatched indentations at 'when' with 'case' at 14
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/yield_parameters.rb:16: warning: mismatched indentations at 'when' with 'case' at 14
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/yield_parameters.rb:17: warning: mismatched indentations at 'else' with 'case' at 14
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:23: warning: mismatched indentations at 'when' with 'case' at 22
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:24: warning: mismatched indentations at 'else' with 'case' at 22
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:82: warning: mismatched indentations at 'when' with 'case' at 81
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:83: warning: mismatched indentations at 'when' with 'case' at 81
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:84: warning: mismatched indentations at 'when' with 'case' at 81
/home/yahonda/.rbenv/versions/2.6.0-dev/lib/ruby/gems/2.6.0/gems/mocha-1.4.0/lib/mocha/cardinality.rb:85: warning: mismatched indentations at 'else' with 'case' at 81
Run options: --seed 25408

# Running:

.....................................................................................................................

Finished in 0.104083s, 1124.1033 runs/s, 1950.3672 assertions/s.

117 runs, 203 assertions, 0 failures, 0 errors, 0 skips
$ ruby -v
ruby 2.6.0dev (2018-04-07 trunk 63108) [x86_64-linux]
$