> test_all             <main>: warning: pthread_create failed for timer: Resource temporarily unavailable, scheduling broken
> <main>: warning: timer thread stack size: 16384

Many CI failures are caused by pthread_create failing for timer.

I will try using POSIX timers API (timer_create/timer_settime/...)
on such platforms to eliminate timer thread (at least for
single-threaded code).  I'll keep old timer-thread coded path
to make cross-platform testing easier, however.

It will take into consideration waitpid+SIGCHLD along with
"Timeout in VM" <https://bugs.ruby-lang.org/issues/14859>

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