Issue #14361 has been updated by MSP-Greg (Greg L).

File 14361_segv.txt added

Confirmed with 2.5.0, 2.4.3 did not occur.  Below shows 2.6/trunk info:

```
ruby 2.6.0dev (2017-12-31 trunk 61522) [x64-mingw32]  Failed SEGV
ruby 2.6.0dev (2018-01-01 trunk 61530) [x64-mingw32]  Passed Syntax Error
```

Fault log attached.

Thanks, Greg

----------------------------------------
Bug #14361: Segmentation fault when array includes two nil's without a comma between them: [nil nil, nil]
https://bugs.ruby-lang.org/issues/14361#change-69597

* Author: khall (Kevin Hall)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
Easily reproduced segmentation fault relating to forgetting to type a comma between nil's in an array. Doesn't occur if array only contains the `nil nil` entry, instead throws a syntax error, which is what I would expect in this case.

Kevins-MacBook-Pro:mvp khall$ ruby -v
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
Kevins-MacBook-Pro:mvp khall$ irb
2.5.0 :001 > [nil nil, nil]
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/workspace.rb:85: [BUG] Segmentation fault at 0x0000000000000020
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports
   for more details.
Don't forget to include the above Crash Report log file in bug reports.

-- Control frame information -----------------------------------------------
c:0018 p:---- s:0093 e:000092 CFUNC  :eval
c:0017 p:0021 s:0085 e:000084 METHOD /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/workspace.rb:85
c:0016 p:0021 s:0077 e:000075 METHOD /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/context.rb:380
c:0015 p:0017 s:0070 e:000069 BLOCK  /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:491
c:0014 p:0025 s:0060 e:000059 METHOD /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:621
c:0013 p:0008 s:0054 e:000053 BLOCK  /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:488
c:0012 p:0102 s:0049 e:000048 BLOCK  /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-lex.rb:246 [FINISH]
c:0011 p:---- s:0045 e:000044 CFUNC  :loop
c:0010 p:0006 s:0041 e:000040 BLOCK  /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-lex.rb:232 [FINISH]
c:0009 p:---- s:0038 e:000037 CFUNC  :catch
c:0008 p:0012 s:0033 e:000032 METHOD /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-lex.rb:231
c:0007 p:0029 s:0029 E:0011d0 METHOD /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:487
c:0006 p:0005 s:0025 e:000024 BLOCK  /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:428 [FINISH]
c:0005 p:---- s:0022 e:000021 CFUNC  :catch
c:0004 p:0063 s:0017 E:001338 METHOD /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:427
c:0003 p:0102 s:0012 e:000011 METHOD /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:383
c:0002 p:0019 s:0006 e:000005 EVAL   /Users/khall/.rvm/rubies/ruby-2.5.0/bin/irb:11 [FINISH]
c:0001 p:0000 s:0003 E:002600 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
/Users/khall/.rvm/rubies/ruby-2.5.0/bin/irb:11:in `<main>'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:383:in `start'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:427:in `run'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:427:in `catch'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:428:in `block in run'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:487:in `eval_input'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-lex.rb:231:in `each_top_level_statement'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-lex.rb:231:in `catch'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-lex.rb:232:in `block in each_top_level_statement'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-lex.rb:232:in `loop'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-lex.rb:246:in `block (2 levels) in each_top_level_statement'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:488:in `block in eval_input'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:621:in `signal_status'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb:491:in `block (2 levels) in eval_input'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/context.rb:380:in `evaluate'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/workspace.rb:85:in `evaluate'
/Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/workspace.rb:85:in `eval'

-- Machine register context ------------------------------------------------
 rax: 0x000000000000291b rbx: 0x00007fe0fd715170 rcx: 0x000000000000a91b
 rdx: 0x0000000000000000 rdi: 0x00007fe0fd715170 rsi: 0x000000000000291b
 rbp: 0x00007ffee3540570 rsp: 0x00007ffee353ef80  r8: 0x0000000000000000
  r9: 0x000000000000004f r10: 0x00007ffee35403b8 r11: 0x000000000000005d
 r12: 0x00007fe0fd744590 r13: 0x0000000000000000 r14: 0x00007fe0fd715140
 r15: 0x00007fe0fd715140 rip: 0x000000010c7b12f1 rfl: 0x0000000000010206

-- C level backtrace information -------------------------------------------
0   libruby.2.5.dylib                   0x000000010c8b0d47 rb_vm_bugreport + 135
1   libruby.2.5.dylib                   0x000000010c7359b8 rb_bug_context + 472
2   libruby.2.5.dylib                   0x000000010c825191 sigsegv + 81
3   libsystem_platform.dylib            0x00007fff770ecf5a _sigtramp + 26
4   libruby.2.5.dylib                   0x000000010c7b12f1 ruby_yyparse + 12945
5   libruby.2.5.dylib                   0x000000010c7c6a46 yycompile0 + 758
6   libruby.2.5.dylib                   0x000000010c8b24f8 rb_suppress_tracing + 216
7   libruby.2.5.dylib                   0x000000010c7c58f7 parser_compile_string + 183
8   libruby.2.5.dylib                   0x000000010c77ef5c rb_iseq_compile_with_option + 348
9   libruby.2.5.dylib                   0x000000010c8acc26 eval_string_with_cref + 614
10  libruby.2.5.dylib                   0x000000010c89a7be rb_f_eval + 334
11  libruby.2.5.dylib                   0x000000010c8a422b vm_call_cfunc + 283
12  libruby.2.5.dylib                   0x000000010c88d984 vm_exec_core + 12196
13  libruby.2.5.dylib                   0x000000010c89eafe vm_exec + 142
14  libruby.2.5.dylib                   0x000000010c8ac224 invoke_block_from_c_bh + 372
15  libruby.2.5.dylib                   0x000000010c8ad293 loop_i + 35
16  libruby.2.5.dylib                   0x000000010c73fd07 rb_rescue2 + 311
17  libruby.2.5.dylib                   0x000000010c8a422b vm_call_cfunc + 283
18  libruby.2.5.dylib                   0x000000010c88cee4 vm_exec_core + 9476
19  libruby.2.5.dylib                   0x000000010c89eafe vm_exec + 142
20  libruby.2.5.dylib                   0x000000010c8ac224 invoke_block_from_c_bh + 372
21  libruby.2.5.dylib                   0x000000010c8ad22e catch_i + 78
22  libruby.2.5.dylib                   0x000000010c89b93d vm_catch_protect + 173
23  libruby.2.5.dylib                   0x000000010c89bff2 rb_f_catch + 66
24  libruby.2.5.dylib                   0x000000010c8a422b vm_call_cfunc + 283
25  libruby.2.5.dylib                   0x000000010c88cee4 vm_exec_core + 9476
26  libruby.2.5.dylib                   0x000000010c89eafe vm_exec + 142
27  libruby.2.5.dylib                   0x000000010c8ac224 invoke_block_from_c_bh + 372
28  libruby.2.5.dylib                   0x000000010c8ad22e catch_i + 78
29  libruby.2.5.dylib                   0x000000010c89b93d vm_catch_protect + 173
30  libruby.2.5.dylib                   0x000000010c89bff2 rb_f_catch + 66
31  libruby.2.5.dylib                   0x000000010c8a422b vm_call_cfunc + 283
32  libruby.2.5.dylib                   0x000000010c88cee4 vm_exec_core + 9476
33  libruby.2.5.dylib                   0x000000010c89eafe vm_exec + 142
34  libruby.2.5.dylib                   0x000000010c73f531 ruby_exec_internal + 177
35  libruby.2.5.dylib                   0x000000010c73f428 ruby_run_node + 56
36  ruby                                0x000000010c6bdf2f main + 79

-- Other runtime information -----------------------------------------------

* Loaded script: irb

* Loaded features:

    0 enumerator.so
    1 thread.rb
    2 rational.so
    3 complex.so
    4 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/x86_64-darwin17/enc/encdb.bundle
    5 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/x86_64-darwin17/enc/trans/transdb.bundle
    6 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/x86_64-darwin17/rbconfig.rb
    7 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/compatibility.rb
    8 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/defaults.rb
    9 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/deprecate.rb
   10 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/errors.rb
   11 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/version.rb
   12 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/requirement.rb
   13 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/platform.rb
   14 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/basic_specification.rb
   15 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/stub_specification.rb
   16 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/util/list.rb
   17 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/x86_64-darwin17/stringio.bundle
   18 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/specification.rb
   19 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/exceptions.rb
   20 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/dependency.rb
   21 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/core_ext/kernel_gem.rb
   22 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/monitor.rb
   23 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb
   24 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems.rb
   25 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/path_support.rb
   26 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/version.rb
   27 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/core_ext/name_error.rb
   28 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/levenshtein.rb
   29 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/jaro_winkler.rb
   30 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/spell_checker.rb
   31 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/delegate.rb
   32 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
   33 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
   34 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/spell_checkers/name_error_checkers.rb
   35 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/spell_checkers/method_name_checker.rb
   36 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/spell_checkers/key_error_checker.rb
   37 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/spell_checkers/null_checker.rb
   38 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean/formatters/plain_formatter.rb
   39 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/gems/2.5.0/gems/did_you_mean-1.2.0/lib/did_you_mean.rb
   40 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/e2mmap.rb
   41 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/init.rb
   42 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/workspace.rb
   43 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/inspector.rb
   44 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/output-method.rb
   45 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/context.rb
   46 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/extend-command.rb
   47 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/notifier.rb
   48 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/slex.rb
   49 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-token.rb
   50 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ruby-lex.rb
   51 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/src_encoding.rb
   52 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/magic-file.rb
   53 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/x86_64-darwin17/readline.bundle
   54 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/input-method.rb
   55 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/locale.rb
   56 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb.rb
   57 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/bundler_version_finder.rb
   58 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/rubygems/util.rb
   59 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/completion.rb
   60 /Users/khall/.rvm/scripts/irbrc.rb
   61 /Users/khall/.rvm/rubies/ruby-2.5.0/lib/ruby/2.5.0/irb/ext/save-history.rb

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.

Abort trap: 6

---Files--------------------------------
ruby_2018-01-15-093218_Kevins-MacBook-Pro.crash (38.6 KB)
seg_fault.rb (15 Bytes)
14361_segv.txt (3 KB)


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