[Bug 283101] pthread_cancel() doesn't cancel a thread that's currently in pause()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283101

--- Comment #14 from Konstantin Belousov <kib@FreeBSD.org> ---
So the victim (would be cancelled) thread has cancel_pending = 1, which mean
that the main thread successfully executed _thr_cancel() against it.  The
actions of _thr_cancel() are setting cancel_pending, and sending SIGCANCEL
to the target using thr_kill(2).

Since the victim is happily sleeping in sigsuspend(), either SIGCANCEL was not
delivered at all, or delivered but ignored due to convoluted threaded handler.
I tried to find any point where SIGCANCEL could be lost, but so far I do not
see it.

Can you please apply the debugging patch below and repeat the same data
gathering?  I want to see if the victim thread' userspace got SIGCANCEL at all.

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