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HTTP/2: fixed sendfile() aio handling.
With sendfile() in threads ("aio threads; sendfile on;"), client connection
can block on writing, waiting for sendfile() to complete. In HTTP/2 this
might result in the request hang, since an attempt to continue processing
in thread event handler will call request's write event handler, which
is usually stopped by ngx_http_v2_send_chain(): it does nothing if there
are no additional data and stream->queued is set. Further, HTTP/2 resets
stream's c->write->ready to 0 if writing blocks, so just fixing
ngx_http_v2_send_chain() is not enough.
Can be reproduced with test suite on Linux with:
TEST_NGINX_GLOBALS_HTTP="aio threads; sendfile on;" prove h2*.t
The following tests currently fail: h2_keepalive.t, h2_priority.t,
h2_proxy_max_temp_file_size.t, h2.t, h2_trailers.t.
Similarly, sendfile() with AIO preloading on FreeBSD can block as well,
with similar results. This is, however, harder to reproduce, especially
on modern FreeBSD systems, since sendfile() usually does not return EBUSY.
Fix is to modify ngx_http_v2_send_chain() so it actually tries to send
data to the main connection when called, and to make sure that
c->write->ready is set by the relevant event handlers.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Thu, 25 Nov 2021 22:02:10 +0300 |
parents | 1bdf906bba99 |
children |
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geo2nginx.pl by Andrei Nigmatulin The perl script to convert CSV geoip database ( free download at http://www.maxmind.com/app/geoip_country ) to format, suitable for use by the ngx_http_geo_module. unicode2nginx by Maxim Dounin The perl script to convert unicode mappings ( available at http://www.unicode.org/Public/MAPPINGS/ ) to the nginx configuration file format. Two generated full maps for windows-1251 and koi8-r. vim by Evan Miller Syntax highlighting of nginx configuration for vim, to be placed into ~/.vim/.