[Bug 246350] kqueue fails to report pipe writable after the read end is closed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246350

--- Comment #2 from Nathaniel Smith <njs at pobox.com> ---
I just tested on using the latest 12.1-STABLE release snapshot
(FreeBSD-12.1-STABLE-amd64-20200507-r360721-disc1.iso). Since r360721 is higher
than r360380, I would expect this to include the fix?

But I still get the same result:

root@:/host-files # uname -a
FreeBSD  12.1-STABLE FreeBSD 12.1-STABLE r360721 GENERIC  amd64
root@:/host-files # python3.8 notes-to-self/fbsd-pipe-close-notify.py
filling pipe buffer
select() says the write pipe is NOT writable
closing read end of pipe
select() says the write pipe is writable
waiting for kqueue to report the write end is writable
[... hang ...]

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