[ruby-core:102226] [Ruby master Bug#17577] Segfault when sending some Exceptions to a Ractor

Issue #17577 has been reported by marcandre (Marc-Andre Lafortune).

----------------------------------------
Bug #17577: Segfault when sending some Exceptions to a Ractor
https://bugs.ruby-lang.org/issues/17577

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* ruby -v: 3.0.0p0
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
The following segfaults:

```ruby
r = Ractor.new { receive }
begin
  foo  # => raises a NoMethodError
rescue Exception => e
  r.send(e)
end
p r.take
```

Note that some exceptions are ok:
```ruby
raise # => ok
raise NoMethodError, '...' # => ok
's'.to_i(-2) # => ok
foo # => segfault
Xyz # => segfault
```

Present on 3.0.0p0 as well as master (ruby 3.1.0dev (2021-01-24T14:26:11Z master 30f11e73c4) [x86_64-darwin18])

```
-- Control frame information -----------------------------------------------
c:0004 p:0003 s:0019 e:000018 METHOD <internal:ractor>:583
c:0003 p:0025 s:0012 e:000011 RESCUE ractor.rb:5
c:0002 p:0025 s:0008 E:000680 EVAL   ractor.rb:2 [FINISH]
c:0001 p:0000 s:0003 E:001b80 (none) [FINISH]
-- C level backtrace information -------------------------------------------
/Users/mal/.rbenv/versions/dev/bin/ruby(rb_vm_bugreport+0x732) [0x105de8672]
/Users/mal/.rbenv/versions/dev/bin/ruby(rb_bug_for_fatal_signal+0x1dc) [0x105bf671c]
/Users/mal/.rbenv/versions/dev/bin/ruby(sigsegv+0x5b) [0x105d3c87b]
/usr/lib/system/libsystem_platform.dylib(_sigtramp+0x1d) [0x7fff61425b5d]
[0x34]
/Users/mal/.rbenv/versions/dev/bin/ruby(rb_objspace_reachable_objects_from+0xa3) [0x105c19193]
/Users/mal/.rbenv/versions/dev/bin/ruby(obj_traverse_replace_i+0x38d) [0x105cedb0d]
/Users/mal/.rbenv/versions/dev/bin/ruby(obj_traverse_replace_i+0x46f) [0x105cedbef]
/Users/mal/.rbenv/versions/dev/bin/ruby(ractor_send+0x18b) [0x105ce8fdb]
/Users/mal/.rbenv/versions/dev/bin/ruby(vm_exec_core+0x77ea) [0x105dbfcaa]
/Users/mal/.rbenv/versions/dev/bin/ruby(rb_vm_exec+0xb36) [0x105dd0916]
/Users/mal/.rbenv/versions/dev/bin/ruby(rb_ec_exec_node+0x14d) [0x105c01aad]
/Users/mal/.rbenv/versions/dev/bin/ruby(ruby_run_node+0x57) [0x105c018f7]
/Users/mal/.rbenv/versions/dev/bin/ruby(main+0x71) [0x105b51141]
```





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