Mercurial > hg > nginx
annotate auto/os/win32 @ 9203:0de20f43db25
Fixed request termination with AIO and subrequests (ticket #2555).
When a request was terminated due to an error via ngx_http_terminate_request()
while an AIO operation was running in a subrequest, various issues were
observed. This happened because ngx_http_request_finalizer() was only set
in the subrequest where ngx_http_terminate_request() was called, but not
in the subrequest where the AIO operation was running. After completion
of the AIO operation normal processing of the subrequest was resumed, leading
to issues.
In particular, in case of the upstream module, termination of the request
called upstream cleanup, which closed the upstream connection. Attempts to
further work with the upstream connection after AIO operation completion
resulted in segfaults in ngx_ssl_recv(), "readv() failed (9: Bad file
descriptor) while reading upstream" errors, or socket leaks.
In ticket #2555, issues were observed with the following configuration
with cache background update (with thread writing instrumented to
introduce a delay, when a client closes the connection during an update):
location = /background-and-aio-write {
proxy_pass ...
proxy_cache one;
proxy_cache_valid 200 1s;
proxy_cache_background_update on;
proxy_cache_use_stale updating;
aio threads;
aio_write on;
limit_rate 1000;
}
Similarly, the same issue can be seen with SSI, and can be caused by
errors in subrequests, such as in the following configuration
(where "/proxy" uses AIO, and "/sleep" returns 444 after some delay,
causing request termination):
location = /ssi-active-boom {
ssi on;
ssi_types *;
return 200 '
<!--#include virtual="/proxy" -->
<!--#include virtual="/sleep" -->
';
limit_rate 1000;
}
Or the same with both AIO operation and the error in non-active subrequests
(which needs slightly different handling, see below):
location = /ssi-non-active-boom {
ssi on;
ssi_types *;
return 200 '
<!--#include virtual="/static" -->
<!--#include virtual="/proxy" -->
<!--#include virtual="/sleep" -->
';
limit_rate 1000;
}
Similarly, issues can be observed with just static files. However,
with static files potential impact is limited due to timeout safeguards
in ngx_http_writer(), and the fact that c->error is set during request
termination.
In a simple configuration with an AIO operation in the active subrequest,
such as in the following configuration, the connection is closed right
after completion of the AIO operation anyway, since ngx_http_writer()
tries to write to the connection and fails due to c->error set:
location = /ssi-active-static-boom {
ssi on;
ssi_types *;
return 200 '
<!--#include virtual="/static-aio" -->
<!--#include virtual="/sleep" -->
';
limit_rate 1000;
}
In the following configuration, with an AIO operation in a non-active
subrequest, the connection is closed only after send_timeout expires:
location = /ssi-non-active-static-boom {
ssi on;
ssi_types *;
return 200 '
<!--#include virtual="/static" -->
<!--#include virtual="/static-aio" -->
<!--#include virtual="/sleep" -->
';
limit_rate 1000;
}
Fix is to introduce r->main->terminated flag, which is to be checked
by AIO event handlers when the r->main->blocked counter is decremented.
When the flag is set, handlers are expected to wake up the connection
instead of the subrequest (which might be already cleaned up).
Additionally, now ngx_http_request_finalizer() is always set in the
active subrequest, so waking up the connection properly finalizes the
request even if termination happened in a non-active subrequest.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 30 Jan 2024 03:20:05 +0300 |
parents | c9235164bbf1 |
children |
rev | line source |
---|---|
455 | 1 |
2 # Copyright (C) Igor Sysoev | |
4412 | 3 # Copyright (C) Nginx, Inc. |
455 | 4 |
5 | |
509 | 6 have=NGX_WIN32 . auto/have_headers |
455 | 7 |
8 CORE_INCS="$WIN32_INCS" | |
9 CORE_DEPS="$WIN32_DEPS" | |
10 CORE_SRCS="$WIN32_SRCS $IOCP_SRCS" | |
11 OS_CONFIG="$WIN32_CONFIG" | |
461 | 12 NGX_ICONS="$NGX_WIN32_ICONS" |
2813
c00763aa5e1b
divide select module into two modules: Unix and Win32 ones
Igor Sysoev <igor@sysoev.ru>
parents:
2731
diff
changeset
|
13 SELECT_SRCS=$WIN32_SELECT_SRCS |
7444
4089b3d2cb59
Win32: added WSAPoll() support.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7443
diff
changeset
|
14 POLL_SRCS=$WIN32_POLL_SRCS |
455 | 15 |
6383 | 16 ngx_pic_opt= |
7031
b7b7f3a0cc28
Configure: use .exe for binaries for all win32 compilers.
Orgad Shaneh <orgads@gmail.com>
parents:
6724
diff
changeset
|
17 ngx_binext=".exe" |
6383 | 18 |
5360
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
19 case "$NGX_CC_NAME" in |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
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20 |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
21 gcc) |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
22 CORE_LIBS="$CORE_LIBS -ladvapi32 -lws2_32" |
6383 | 23 MAIN_LINK="$MAIN_LINK -Wl,--export-all-symbols" |
24 MAIN_LINK="$MAIN_LINK -Wl,--out-implib=$NGX_OBJS/libnginx.a" | |
25 MODULE_LINK="-shared -L $NGX_OBJS -lnginx" | |
5360
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
26 ;; |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
27 |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
28 *) |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
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29 CORE_LIBS="$CORE_LIBS advapi32.lib ws2_32.lib" |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
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30 ;; |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
|
31 |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
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32 esac |
3d2d3e1cf427
Win32: MinGW GCC compatibility.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
diff
changeset
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33 |
455 | 34 EVENT_MODULES="$EVENT_MODULES $IOCP_MODULE" |
7445
c9235164bbf1
Win32: enabled both select and poll on Windows by default.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7444
diff
changeset
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35 #EVENT_FOUND=YES |
455 | 36 |
6724
a6d116645c51
Configure: removed the --with-ipv6 option.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6383
diff
changeset
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37 have=NGX_HAVE_INET6 . auto/have |
2814 | 38 |
469 | 39 have=NGX_HAVE_IOCP . auto/have |