[ruby-core:78899] [Ruby trunk Bug#13084] String cast to Rational on 2.4.0p0 results in SegFault with Mathn required

Issue #13084 has been updated by Russell Osborne.

Subject changed from String Cast to Rational on 2.4.0p0 results in SegFault with Mathn Required to String cast to Rational on 2.4.0p0 results in SegFault with Mathn required

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Bug #13084: String cast to Rational on 2.4.0p0 results in SegFault with Mathn required
https://bugs.ruby-lang.org/issues/13084#change-62311

* Author: Russell Osborne
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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See the below example, while `mathn` is required recasting a string into a Rational causes a SegFault.  Remove mathn and the code will not crash.

~~~ ruby
require 'mathn'

# Both result in Segfault
Rational("5/5")
"5/5".to_r
~~~

segfault_test.rb:5: [BUG] Segmentation fault at 0x0000000000001b
ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/CrashReporter
     * /Library/Logs/CrashReporter
     * ~/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:0003 p:---- s:0010 e:000009 CFUNC  :to_r
c:0002 p:0016 s:0006 e:000005 EVAL   segfault_test.rb:5 [FINISH]
c:0001 p:0000 s:0003 E:0022d0 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
segfault_test.rb:5:in `<main>'
segfault_test.rb:5:in `to_r'

-- Machine register context ------------------------------------------------
 rax: 0x0000000000000000 rbx: 0x000000000000000b rcx: 0xaf82f5dc522c0078
 rdx: 0x00007fff5106bcc1 rdi: 0x000000000000000b rsi: 0x000000000000000b
 rbp: 0x00007fff5106bd10 rsp: 0x00007fff5106bcf0  r8: 0x00007fff5106bc4c
  r9: 0x000000000000000a r10: 0x0000000000000005 r11: 0x000000000000000a
 r12: 0x0000000000004000 r13: 0x000000000000003f r14: 0x000000000000000b
 r15: 0x00007fff5106bd98 rip: 0x000000010ec9f90a rfl: 0x0000000000010246

-- C level backtrace information -------------------------------------------
0   ruby                                0x000000010ed5efe4 rb_vm_bugreport + 388
1   ruby                                0x000000010ebf93da rb_bug_context + 490
2   ruby                                0x000000010ecdaf48 sigsegv + 72
3   libsystem_platform.dylib            0x00007fffba3b2bba _sigtramp + 26
4   ruby                                0x000000010ec9f90a nurat_div + 266
5   ruby                                0x000000010ec9eb71 parse_rat + 593
6   ruby                                0x000000010eca1a91 string_to_r + 145
7   ruby                                0x000000010ed5246e vm_call_cfunc + 302
8   ruby                                0x000000010ed3c78c vm_exec_core + 11932
9   ruby                                0x000000010ed4cfc4 vm_exec + 116
10  ruby                                0x000000010ec02028 ruby_exec_internal + 136
11  ruby                                0x000000010ec01f46 ruby_run_node + 54
12  ruby                                0x000000010eb935cf main + 79

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

* Loaded script: segfault_test.rb

* Loaded features:

    0 enumerator.so
    1 thread.rb
    2 rational.so
    3 complex.so
    4 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/x86_64-darwin16/enc/encdb.bundle
    5 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/x86_64-darwin16/enc/trans/transdb.bundle
    6 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/unicode_normalize.rb
    7 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/x86_64-darwin16/rbconfig.rb
    8 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/compatibility.rb
    9 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/defaults.rb
   10 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/deprecate.rb
   11 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/errors.rb
   12 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/version.rb
   13 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/requirement.rb
   14 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/platform.rb
   15 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/basic_specification.rb
   16 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/stub_specification.rb
   17 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/util/list.rb
   18 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/x86_64-darwin16/stringio.bundle
   19 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/specification.rb
   20 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/exceptions.rb
   21 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/dependency.rb
   22 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/core_ext/kernel_gem.rb
   23 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/monitor.rb
   24 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb
   25 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems.rb
   26 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/rubygems/path_support.rb
   27 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/version.rb
   28 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/core_ext/name_error.rb
   29 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/levenshtein.rb
   30 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/jaro_winkler.rb
   31 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/spell_checker.rb
   32 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/delegate.rb
   33 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
   34 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
   35 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/spell_checkers/name_error_checkers.rb
   36 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/spell_checkers/method_name_checker.rb
   37 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/spell_checkers/null_checker.rb
   38 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean/formatter.rb
   39 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/did_you_mean-1.1.0/lib/did_you_mean.rb
   40 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/cmath.rb
   41 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/e2mmap.rb
   42 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/matrix.rb
   43 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/singleton.rb
   44 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/forwardable/impl.rb
   45 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/forwardable.rb
   46 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/prime.rb
   47 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/x86_64-darwin16/mathn/rational.bundle
   48 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/x86_64-darwin16/mathn/complex.bundle
   49 /Users/rposborne/.rbenv/versions/2.4.0/lib/ruby/2.4.0/mathn.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

[1]    1319 abort      ruby segfault_test.rb



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