[Bug 271490] Deadlock between _rtld_atfork_pre and _thr_attr_init

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

--- Comment #12 from KJ Tsanaktsidis <kj@kjtsanaktsidis.id.au> ---
Yes - https://reviews.freebsd.org/D40178 seems to fix the issue with running
the ruby tests. I applied it on top of the `releng/13.2` branch on my system
and followed the  I've been running the test in question for half an hour in a
loop and no failures yet!

Thanks so much for your help debugging this. I must say - this has been my
first experience with anything in BSD-world, and I've really appreciated having
the source for the base system all in one giant git repo together. Makes it
easy to go spelunking and understand how it all fits together. As someone who
recently spent many hours staring at #ifdef soup across glibc, libgcc_s, and
the Linux kernel recently, it's been very refreshing!

I don't really know how the backport process works - is your intention to
backport this to 13.1/13.2 or would the fix just apply from 13.3 forward? If
there's no backport I'll probably add `LD_BIND_NOW=yes` to the Ruby test runner
for FreeBSD <= 13.2 - does this seem reasonable?

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