hello awesome nginx developers,

i am having some odd behavior issues when in http3 / quic mode.

i am using a completely-up-to-date nginx-quic build on a debian 9 box.

my nginx php-fpm configuration has been solid and unchanging for years
and years.

if i disable http3 / quic, things work great in http2 mode. if i enable
http3 / quic mode, something is causing all php7.3-fpm pages to generate
"500 Internal Server Error" pages. static html pages render perfectly.

despite adding all the extra log arguments to nginx and to php7.3-fpm
(display_errors and the rest) i am only seeing the following in the
nginx error log:

2020/10/10 21:19:47 [alert] 10614#0: *37 epoll_ctl(1, -1) failed (9: Bad
file descriptor), client: X.X.X, server: example.com, request: "GET
/php_test_page HTTP/3"

there is nothing to be seen in any other browser or server log. the
server does send the default / implied favicon.ico perfectly. the php
test page is only a phpinfo() command.

i have always used the fastcgi_pass socket setup, but i have also tried
the port version (same problem).

the same exact thing happens when i try it with a completely-up-to-date
nginx-quiche build on a different server.

i have not had much luck tracking down info on "epoll_ctl".

any thoughts or suggestions?

if i can help with logs, please let me know.
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