[ruby-core:109107] [Ruby master Bug#18794] Windows ucrt - intermittent SEGV TestObjSpace#test_reachable_objects_during_iteration

Issue #18794 has been updated by MSP-Greg (Greg L).


This test is still causing intermittent failures.  I tried it locally, and (of course) it did not SEGV.

I modified the test as below:

test/objspacetest_objspace.rb

Original:
```ruby
def test_reachable_objects_during_iteration
  opts = %w[--disable=gems,frozen-string-literal -robjspace]
  assert_separately opts, "#{<<-"begin;"}\n#{<<-'end;'}"
  begin;
    ObjectSpace.each_object{|o|
      o.inspect
      ObjectSpace.reachable_objects_from(Class)
    }
  end;
end
```

Modified:
```ruby
def test_reachable_objects_during_iteration
  opts = %w[--disable=gems,frozen-string-literal -robjspace]
  assert_separately opts, "#{<<-"begin;"}\n#{<<-'end;'}"
  begin;
    ObjectSpace.each_object{|o|
      STDOUT.syswrite "\n#{o.class}"  # added this line
      o.inspect
      ObjectSpace.reachable_objects_from(Class)
    }
  end;
end
```

All three Windows builds failed with the following error:

```
  1) Error:
TestObjSpace#test_reachable_objects_during_iteration:
NoMethodError: undefined method `unpack1' for nil:NilClass
    C:/Greg/GitHub/ruby/test/objspace/test_objspace.rb:145:in `test_reachable_objects_during_iteration'
```

ruby -v: ruby 3.2.0dev (2022-06-30T16:45:39Z master 5df20a5da5) [x64-mingw32]
ruby 3.2.0dev (2022-06-30T16:45:39Z master 5df20a5da5) [x64-mswin64_140]
ruby 3.2.0dev (2022-06-30T16:45:39Z master 5df20a5da5) [x64-mingw-ucrt]

But, using WLS2/Ubuntu 22.04, about 7k object classes were logged.

ruby 3.2.0dev (2022-06-30T16:45:39Z master 5df20a5da5) [x86_64-linux]

Not sure if this helps, but it seems odd...


----------------------------------------
Bug #18794: Windows ucrt - intermittent SEGV TestObjSpace#test_reachable_objects_during_iteration
https://bugs.ruby-lang.org/issues/18794#change-98253

* Author: MSP-Greg (Greg L)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.0dev (2022-05-20T15:42:07Z master 11336c7ddb) [x64-mingw-ucrt]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Test runs in retry, generates the following (removed path from x64-ucrt-ruby320.dll).  mswin build runs it as a single test, I don't believe it's failed.

```
  1) Failure:
TestObjSpace#test_reachable_objects_during_iteration      Line: 145  
assert_separately failed with error message
pid 70572 exit 3
| -:8: [BUG] Unnormalized Fixnum value 0x0000023f8eeb2119
| ruby 3.2.0dev (2022-05-20T15:42:07Z master 11336c7ddb) [x64-mingw-ucrt]
| 
| -- Control frame information -----------------------------------------------
| c:0006 p:---- s:0021 e:000020 CFUNC  :to_s
| c:0005 p:---- s:0018 e:000017 CFUNC  :inspect
| c:0004 p:0004 s:0014 e:000013 BLOCK  -:8 [FINISH]
| c:0003 p:---- s:0010 e:000009 CFUNC  :each_object
| c:0002 p:0073 s:0006 e:000005 EVAL   -:7 [FINISH]
| c:0001 p:0000 s:0003 E:002060 (none) [FINISH]
| 
| -- Ruby level backtrace information ----------------------------------------
| -:7:in `<main>'
| -:7:in `each_object'
| -:8:in `block in <main>'
| -:8:in `inspect'
| -:8:in `to_s'
| 
| -- C level backtrace information -------------------------------------------
| C:\Windows\SYSTEM32\ntdll.dll(NtWaitForSingleObject+0x14) [0x00007ffbdb40ef74]
| C:\Windows\System32\KERNELBASE.dll(WaitForSingleObjectEx+0x8e) [0x00007ffbd89fe7ae]
| x64-ucrt-ruby320.dll(rb_vm_bugreport+0x313) [0x00007ffba62417c3]
| x64-ucrt-ruby320.dll(rb_bug_without_die+0x75) [0x00007ffba6039d15]
| x64-ucrt-ruby320.dll(rb_bug+0x33) [0x00007ffba626e014]
| x64-ucrt-ruby320.dll(rb_out_of_int+0x42) [0x00007ffba626f81b]
| x64-ucrt-ruby320.dll(rb_vm_invoke_proc+0x22c) [0x00007ffba622c34c]
| x64-ucrt-ruby320.dll(rb_eval_cmd_kw+0x5ea) [0x00007ffba6230e7a]
| x64-ucrt-ruby320.dll(rb_funcallv+0x11) [0x00007ffba62310c1]
| x64-ucrt-ruby320.dll(rb_inspect+0x17) [0x00007ffba60f9417]
| x64-ucrt-ruby320.dll(rb_hash_values+0xfc1) [0x00007ffba606e791]
| x64-ucrt-ruby320.dll(rb_hash_values+0x102c) [0x00007ffba606e7fc]
| x64-ucrt-ruby320.dll(rb_st_foreach_check+0x77) [0x00007ffba61a1637]
| x64-ucrt-ruby320.dll(rb_hash_set_default_proc+0x1e19) [0x00007ffba60724a9]
| x64-ucrt-ruby320.dll(rb_ensure+0x18f) [0x00007ffba60453af]
| x64-ucrt-ruby320.dll(rb_hash_set_default_proc+0x2272) [0x00007ffba6072902]
| x64-ucrt-ruby320.dll(rb_hash_aset+0x1d1f) [0x00007ffba6077c2f]
| x64-ucrt-ruby320.dll(rb_mutex_trylock+0x51c) [0x00007ffba61d864c]
| x64-ucrt-ruby320.dll(rb_exec_recursive+0x17) [0x00007ffba61e0217]
| x64-ucrt-ruby320.dll(rb_error_arity+0x26e) [0x00007ffba62182ee]
| x64-ucrt-ruby320.dll(rb_vm_call_with_refinements+0x47d) [0x00007ffba6233fed]
| x64-ucrt-ruby320.dll(rb_vm_exec+0x255) [0x00007ffba62252a5]
| x64-ucrt-ruby320.dll(rb_yield+0x1e8) [0x00007ffba622ac88]
| x64-ucrt-ruby320.dll(rb_obj_id+0x1c94) [0x00007ffba6057024]
| x64-ucrt-ruby320.dll(rb_size_mul_or_raise+0x154) [0x00007ffba605c464]
| x64-ucrt-ruby320.dll(rb_ensure+0x18f) [0x00007ffba60453af]
| x64-ucrt-ruby320.dll(rb_objspace_each_objects_without_setup+0x1ac) [0x00007ffba606562c]
| x64-ucrt-ruby320.dll(rb_error_arity+0x26e) [0x00007ffba62182ee]
| x64-ucrt-ruby320.dll(rb_vm_search_method_slowpath+0x723) [0x00007ffba621ce33]
| x64-ucrt-ruby320.dll(rb_vm_call_with_refinements+0x4e8) [0x00007ffba6234058]
| x64-ucrt-ruby320.dll(rb_vm_exec+0x255) [0x00007ffba62252a5]
| x64-ucrt-ruby320.dll(rb_call_end_proc+0x130) [0x00007ffba603e400]
| x64-ucrt-ruby320.dll(ruby_run_node+0xa5) [0x00007ffba6044145]
|  [0x00007ff62fcc15a8]
|  [0x00007ff62fcc13b1]
|  [0x00007ff62fcc14e6]
| C:\Windows\System32\KERNEL32.DLL(BaseThreadInitThunk+0x10) [0x00007ffbd93c4ed0]
```



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