[Bug 271490] Deadlock between _rtld_atfork_pre and _thr_attr_init

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271490

--- Comment #5 from KJ Tsanaktsidis <kj@kjtsanaktsidis.id.au> ---
> Can you please provide me the stand-alone ruby program that demonstrates the
problem in non-disputable way, and the exact instructions how to launch it?

Unfortunately I still haven't been able to isolate the problem outside of the
actual Ruby test harness.... so this is all a bit involved. I've been trying to
develop a minimal reproduction (with either C or Ruby) but I haven't had any
luck so far.

* You'll need `git`, `autoconf`, `automake`, `bison`, `m4`, `libffi`,
`libunwind`, and `libyaml`.
* Clone my Ruby fork: `git clone https://github.com/KJTsanaktsidis/ruby.git`
* Check out this commit (includes some _other_ fixes necessary to surface this
problem): `git checkout d5471e6e1e8b81d7c7e960538d138868db0e0707`
* `autoreconf -fi`
* `./configure` (I don't think any particular flags are needed)
* `make`

Then, use the built ruby to run this particular test in a loop, until
eventually it hangs:

```
while ./miniruby -I./lib -I. -I.ext/common ./tool/runruby.rb --extout=.ext --
./test/runner.rb test/ruby/test_process.rb -n test_daemon_no_threads; do echo
"ok"; done;
```

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