[ruby-core:103759] [Ruby master Bug#17854] Crash with certain "case" expressions on FreeBSD

Issue #17854 has been reported by [e-mail] (Koichiro Iwao).

----------------------------------------
Bug #17854: Crash with certain "case" expressions on FreeBSD
https://bugs.ruby-lang.org/issues/17854

* Author: [e-mail] (Koichiro Iwao)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.3p183 (2021-04-05 revision 6847ee089d) [amd64-freebsd13]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
## Affected version
* Ruby 2.6, 2.7, 3.0 compiled with **clang on FressBD**

No tested with other versions. Ruby compiled with GCC doesn't have this issue.

## Snippet to reproduce
```
ruby -e 'case 1; when 2r; 3; end'
```

## Step to reproduce

Prepare a fresh installation of FreeBSD 13. Either Ruby installed from system package or ruby-build can reproduce the issue.


```
# clang -v 
FreeBSD clang version 11.0.1 ([e-mail]:llvm/llvm-project.git llvmorg-11.0.1-0-g43ff75f2c3fe)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin
[root@ruby-bug /tmp]# clang -v 
FreeBSD clang version 11.0.1 ([e-mail]:llvm/llvm-project.git llvmorg-11.0.1-0-g43ff75f2c3fe)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin
```

### System Ruby


```
# pkg install ruby 
# /usr/local/bin/ruby -v
# /usr/local/bin/ruby -e 'case 1; when 2r; 3; end'
```

### Ruby installed by ruby-build

Same as Ruby installed by ruby-build.
```
# pkg install rbenv ruby-build
# bash
bash# eval "$(rbenv init -)"
bash# cd /tmp
bash# rbenv install 2.7.3
bash# rbenv local 2.7.3
bash# rbenv which ruby
/root/.rbenv/versions/2.7.3/bin/ruby
bash# ruby -e 'case 1; when 2r; 3; end'
```

## See also
Downstream bug:
* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255583

---Files--------------------------------
trace.log (37.5 KB)


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