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Moved handling of wev->delayed to the connection event handler.

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With post_action or subrequests, it is possible that the timer set for
wev->delayed will expire while the active subrequest write event handler
is not ready to handle this.  This results in request hangs as observed
with limit_rate / sendfile_max_chunk and post_action (ticket #776) or
subrequests (ticket #1228).

Moving the handling to the connection event handler fixes the hangs observed,
and also slightly simplifies the code.
This commit is contained in:
Maxim Dounin 2017-04-02 14:32:29 +03:00
parent 96e4e84ce2
commit 5d5f0dcac4
4 changed files with 26 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/http/modules/ngx_http_limit_req_module.c
View File

@ -294,7 +294,7 @@ ngx_http_limit_req_delay(ngx_http_request_t *r)
wev = r->connection->write;
if (wev->delayed && !wev->timedout) {
if (wev->delayed) {
if (ngx_handle_write_event(wev, 0) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
@ -303,9 +303,6 @@ ngx_http_limit_req_delay(ngx_http_request_t *r)
return;
}
wev->delayed = 0;
wev->timedout = 0;
if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;

5
src/http/modules/perl/ngx_http_perl_module.c
View File

@ -278,7 +278,7 @@ ngx_http_perl_sleep_handler(ngx_http_request_t *r)
wev = r->connection->write;
if (wev->delayed && !wev->timedout) {
if (wev->delayed) {
if (ngx_handle_write_event(wev, 0) != NGX_OK) {
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
@ -287,9 +287,6 @@ ngx_http_perl_sleep_handler(ngx_http_request_t *r)
return;
}
wev->delayed = 0;
wev->timedout = 0;
ngx_http_perl_handle_request(r);
}

25
src/http/ngx_http_request.c
View File

@ -2198,6 +2198,11 @@ ngx_http_request_handler(ngx_event_t *ev)
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http run request: \"%V?%V\"", &r->uri, &r->args);
if (ev->delayed && ev->timedout) {
ev->delayed = 0;
ev->timedout = 0;
}
if (ev->write) {
r->write_event_handler(r);
@ -2621,7 +2626,6 @@ ngx_http_writer(ngx_http_request_t *r)
clcf = ngx_http_get_module_loc_conf(r->main, ngx_http_core_module);
if (wev->timedout) {
if (!wev->delayed) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
"client timed out");
c->timedout = 1;
@ -2630,25 +2634,14 @@ ngx_http_writer(ngx_http_request_t *r)
return;
}
wev->timedout = 0;
wev->delayed = 0;
if (!wev->ready) {
ngx_add_timer(wev, clcf->send_timeout);
if (ngx_handle_write_event(wev, clcf->send_lowat) != NGX_OK) {
ngx_http_close_request(r, 0);
}
return;
}
}
if (wev->delayed || r->aio) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0,
"http writer delayed");
if (!wev->delayed) {
ngx_add_timer(wev, clcf->send_timeout);
}
if (ngx_handle_write_event(wev, clcf->send_lowat) != NGX_OK) {
ngx_http_close_request(r, 0);
}

49
src/http/ngx_http_upstream.c
View File

@ -1232,6 +1232,11 @@ ngx_http_upstream_handler(ngx_event_t *ev)
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http upstream request: \"%V?%V\"", &r->uri, &r->args);
if (ev->delayed && ev->timedout) {
ev->delayed = 0;
ev->timedout = 0;
}
if (ev->write) {
u->write_event_handler(r, u);
@ -3796,31 +3801,9 @@ ngx_http_upstream_process_downstream(ngx_http_request_t *r)
if (wev->timedout) {
if (wev->delayed) {
wev->timedout = 0;
wev->delayed = 0;
if (!wev->ready) {
ngx_add_timer(wev, p->send_timeout);
if (ngx_handle_write_event(wev, p->send_lowat) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
}
return;
}
if (ngx_event_pipe(p, wev->write) == NGX_ABORT) {
ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
return;
}
} else {
p->downstream_error = 1;
c->timedout = 1;
ngx_connection_error(c, NGX_ETIMEDOUT, "client timed out");
}
} else {
@ -3865,30 +3848,8 @@ ngx_http_upstream_process_upstream(ngx_http_request_t *r,
if (rev->timedout) {
if (rev->delayed) {
rev->timedout = 0;
rev->delayed = 0;
if (!rev->ready) {
ngx_add_timer(rev, p->read_timeout);
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
}
return;
}
if (ngx_event_pipe(p, 0) == NGX_ABORT) {
ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
return;
}
} else {
p->upstream_error = 1;
ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out");
}
} else {