Mercurial > hg > nginx
annotate src/event/ngx_event_pipe.h @ 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 | adc2414856b1 |
children |
rev | line source |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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8 #ifndef _NGX_EVENT_PIPE_H_INCLUDED_ |
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9 #define _NGX_EVENT_PIPE_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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14 #include <ngx_event.h> |
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17 typedef struct ngx_event_pipe_s ngx_event_pipe_t; |
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19 typedef ngx_int_t (*ngx_event_pipe_input_filter_pt)(ngx_event_pipe_t *p, |
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20 ngx_buf_t *buf); |
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21 typedef ngx_int_t (*ngx_event_pipe_output_filter_pt)(void *data, |
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22 ngx_chain_t *chain); |
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23 |
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25 struct ngx_event_pipe_s { |
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26 ngx_connection_t *upstream; |
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27 ngx_connection_t *downstream; |
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28 |
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29 ngx_chain_t *free_raw_bufs; |
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30 ngx_chain_t *in; |
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31 ngx_chain_t **last_in; |
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32 |
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33 ngx_chain_t *writing; |
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34 |
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35 ngx_chain_t *out; |
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36 ngx_chain_t *free; |
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37 ngx_chain_t *busy; |
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38 |
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39 /* |
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40 * the input filter i.e. that moves HTTP/1.1 chunks |
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41 * from the raw bufs to an incoming chain |
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42 */ |
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44 ngx_event_pipe_input_filter_pt input_filter; |
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45 void *input_ctx; |
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47 ngx_event_pipe_output_filter_pt output_filter; |
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48 void *output_ctx; |
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49 |
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50 #if (NGX_THREADS || NGX_COMPAT) |
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51 ngx_int_t (*thread_handler)(ngx_thread_task_t *task, |
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52 ngx_file_t *file); |
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53 void *thread_ctx; |
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54 ngx_thread_task_t *thread_task; |
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55 #endif |
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56 |
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57 unsigned read:1; |
1565 | 58 unsigned cacheable:1; |
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59 unsigned single_buf:1; |
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60 unsigned free_bufs:1; |
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61 unsigned upstream_done:1; |
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62 unsigned upstream_error:1; |
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63 unsigned upstream_eof:1; |
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64 unsigned upstream_blocked:1; |
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65 unsigned downstream_done:1; |
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66 unsigned downstream_error:1; |
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67 unsigned cyclic_temp_file:1; |
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68 unsigned aio:1; |
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69 |
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70 ngx_int_t allocated; |
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71 ngx_bufs_t bufs; |
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72 ngx_buf_tag_t tag; |
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73 |
473 | 74 ssize_t busy_size; |
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75 |
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76 off_t read_length; |
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77 off_t length; |
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78 |
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79 off_t max_temp_file_size; |
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80 ssize_t temp_file_write_size; |
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81 |
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82 ngx_msec_t read_timeout; |
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83 ngx_msec_t send_timeout; |
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84 ssize_t send_lowat; |
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85 |
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86 ngx_pool_t *pool; |
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87 ngx_log_t *log; |
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88 |
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89 ngx_chain_t *preread_bufs; |
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90 size_t preread_size; |
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91 ngx_buf_t *buf_to_file; |
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92 |
5883
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93 size_t limit_rate; |
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94 time_t start_sec; |
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95 |
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96 ngx_temp_file_t *temp_file; |
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97 |
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98 /* STUB */ int num; |
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99 }; |
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100 |
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101 |
1599 | 102 ngx_int_t ngx_event_pipe(ngx_event_pipe_t *p, ngx_int_t do_write); |
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103 ngx_int_t ngx_event_pipe_copy_input_filter(ngx_event_pipe_t *p, ngx_buf_t *buf); |
483 | 104 ngx_int_t ngx_event_pipe_add_free_buf(ngx_event_pipe_t *p, ngx_buf_t *b); |
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105 |
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106 |
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107 #endif /* _NGX_EVENT_PIPE_H_INCLUDED_ */ |