[Bug 290844] timeout / reaper: Spurious interrupt on SIGCONT

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290844

--- Comment #8 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Bryan Drewery from comment #7)
Ok, this is much less mysterious then.

I would say that the behavior that ANYSTOP/SIGCONT causes spurious EINTR
is too well-established to be changed.  I recently changed ptrace(PT_ATTACH)
to not interrupt sleeps in this way, and it still not settled.  I think
that making much more common scenario change would be too much breakage.

In other words, I believe that the fix belongs to sh(1) and not kernel.
Perhaps sh should check if the timeout was actually reached before pretending
to generate fake SIGALRM, if there is any timeout at all.

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