crash in ngx_add_timer
Dk Jack
dnj0496 at gmail.com
Wed Apr 19 02:03:53 UTC 2017
Hi,
The crash is happening at line:
ngx_add_timer(&ev2, 6); // line 81
i.e. when it's trying to insert the second time. It doesn't even get to the
handler.
What would be a good value to assign to ev->log? I added:
ev->log = cf->cycle->log
I am still getting the crash when I try to insert the second timer.
On Tue, Apr 18, 2017 at 6:53 PM, 胡聪 (hucc) <hucong.c at foxmail.com> wrote:
> Hi,
>
> At the first glance, the ev->log should be assigned a valid value.
>
>
> ------------------ Original ------------------
> *From: * "Dk Jack";<dnj0496 at gmail.com>;
> *Send time:* Wednesday, Apr 19, 2017 8:23 AM
> *To:* "nginx-devel"<nginx-devel at nginx.org>;
> *Subject: * Re: crash in ngx_add_timer
>
> resending since the attachment which had the code didn't make it...
>
> Dk.
>
> #include <assert.h>
> #include <nginx.h>
> #include <ngx_config.h>
> #include <ngx_core.h>
> #include <ngx_http.h>
>
> static ngx_event_t ev1;
> static ngx_event_t ev2;
> static ngx_event_t ev3;
>
> char ev1_data[] = "event1";
> char ev2_data[] = "event2";
> char ev3_data[] = "event3";
>
> static ngx_int_t
> ngx_test_handler(ngx_http_request_t *r)
> {
> if (r->main->internal) {
> return NGX_DECLINED;
> }
>
> r->main->internal = 1;
>
> ngx_table_elt_t *h;
> h = ngx_list_push(&r->headers_out.headers);
> h->hash = 1;
> ngx_str_set(&h->key, "X-NGINX-Test");
> ngx_str_set(&h->value, "Hello World!");
>
> return NGX_DECLINED;
> }
>
> static void
> ev1_handler(ngx_event_t* ev)
> {
> ngx_log_error(NGX_LOG_ERR, ev->log, 0, "received event: %s", (char *)
> ev->data);
> ngx_add_timer(&ev1, 5);
> }
>
> static void
> ev2_handler(ngx_event_t* ev)
> {
> ngx_log_error(NGX_LOG_ERR, ev->log, 0, "received event: %s", (char *)
> ev->data);
> ngx_add_timer(&ev2, 6);
> }
>
> static void
> ev3_handler(ngx_event_t* ev)
> {
> ngx_log_error(NGX_LOG_ERR, ev->log, 0, "received event: %s", (char *)
> ev->data);
> ngx_add_timer(&ev3, 7);
> }
>
> static ngx_int_t
> ngx_test_init (ngx_conf_t *cf)
> {
> ngx_http_handler_pt *h;
> ngx_http_core_main_conf_t *cmcf;
>
> cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
> h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
>
> if (h == NULL) {
> ngx_log_error(NGX_LOG_ERR, cf->log, 0, "Cannot retrieve Nginx access
> handler pointer");
> return NGX_ERROR;
> }
>
> *h = ngx_test_handler;
> ngx_log_error(NGX_LOG_INFO, cf->log, 0, "[test] Installed test handler");
>
> ev1.handler = ev1_handler;
> ev1.data = ev1_data;
>
> ev2.handler = ev2_handler;
> ev2.data = ev2_data;
>
> ev3.handler = ev3_handler;
> ev3.data = ev3_data;
>
> ngx_add_timer(&ev1, 5);
> ngx_add_timer(&ev2, 6);
> ngx_add_timer(&ev3, 7);
>
> return NGX_OK;
> }
>
> static char *
> parse_test_configuration (ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
> {
> ngx_str_t *value;
>
> if (cf->args->nelts != 2) {
> ngx_log_error(NGX_LOG_ERR, cf->log, 0
> , "[ss-config] invalid params for config_file. Expected
> 2 received %d"
> , cf->args->nelts);
> return NGX_CONF_ERROR;
> }
>
> value = cf->args->elts;
>
> ngx_log_error(NGX_LOG_ERR, cf->log, 0, "file-path: %V", &value[1]);
>
> return NGX_CONF_OK;
> }
>
>
> static ngx_http_module_t ngx_test_module_ctx = {
> NULL, /* preconfiguration */
> ngx_test_init, /* postconfiguration */
> NULL, /* create main configuration */
> NULL, /* init main configuration */
> NULL, /* create server configuration */
> NULL, /* merge server configuration */
> NULL, /* create location configuration */
> NULL /* merge location configuration */
> };
>
> static ngx_command_t ngx_test_module_cmds[] = {
> {
> ngx_string("config_file"),
> NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
> parse_test_configuration,
> 0,
> 0,
> NULL
> }
> , ngx_null_command
> };
>
> ngx_module_t nginx_test_module = {
> NGX_MODULE_V1,
> &ngx_test_module_ctx, /* module context */
> ngx_test_module_cmds, /* module directives */
> NGX_HTTP_MODULE, /* module type */
> NULL, /* init master */
> NULL, /* init module */
> NULL, /* init process */
> NULL, /* init thread */
> NULL, /* exit thread */
> NULL, /* exit process */
> NULL, /* exit master */
> NGX_MODULE_V1_PADDING
> };
>
>
> On Tue, Apr 18, 2017 at 5:12 PM, Dk Jack <dnj0496 at gmail.com> wrote:
>
>> Hi,
>> I am new to NGinx modules and I trying to write an nginx module. I am
>> having an issue
>> where my module crashes when adding multiple timers. The first timer adds
>> fine.
>> However, when I go to add the second timer, it crashes. I've simplified
>> the code to a very
>> basic module (which is attached to this email). The backtrace is provided
>> as well.
>> Do I need to do some sort of initialization before I add multiple timers.
>> Any advice/help
>> is appreciated. Thanks.
>>
>> Dk.
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x0000000000000000 in ?? ()
>> (gdb) bt
>> #0 0x0000000000000000 in ?? ()
>> #1 0x000000000040d68b in ngx_rbtree_insert (tree=0x69dda0
>> <ngx_event_timer_rbtree>,
>> node=node at entry=0x69db08 <ev2+40>) at src/core/ngx_rbtree.c:44
>> #2 0x000000000046ceb2 in ngx_event_add_timer (timer=6, ev=0x69dae0 <ev2>)
>> at src/event/ngx_event_timer.h:84
>> #3 ngx_test_init (cf=<optimized out>)
>> at /home/ubuntu/git/mitigator/nginx/build/../modules/nginx_miti
>> gator_module/platform/nginx-test-module.c:81
>> #4 0x0000000000424e83 in ngx_http_block (cf=0x7fffffffe0a0,
>> cmd=<optimized out>,
>> conf=<optimized out>) at src/http/ngx_http.c:315
>> #5 0x000000000041446b in ngx_conf_handler (last=1, cf=0x7fffffffe0a0)
>> at src/core/ngx_conf_file.c:427
>> #6 ngx_conf_parse (cf=cf at entry=0x7fffffffe0a0, filename=filename at entry
>> =0x6ad570)
>> at src/core/ngx_conf_file.c:283
>> #7 0x0000000000411e1a in ngx_init_cycle (old_cycle=old_cycle at entry=0x7
>> fffffffe260)
>> at src/core/ngx_cycle.c:268
>> #8 0x0000000000404208 in main (argc=<optimized out>, argv=<optimized
>> out>) at src/core/nginx.c:268
>> (gdb)
>>
>
>
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