After initializing websocket, the error httpd: httpd_server: error in select (9) will appear. (IDFGH-14242)

[wolen666]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

1.Initialize websocket, the original initialization code is as follows

static const httpd_uri_t page = {
.uri = "/",
.method = HTTP_GET,
.handler = page_get_handler,
.user_ctx = NULL,
.is_websocket = true
};
static const httpd_uri_t ctrl = {
.uri = "/ws/",
.method = HTTP_GET,
.handler = ctrl_post_handler,
.user_ctx = NULL,
.is_websocket = true

};

static const httpd_uri_t timer = {
.uri = "/timer/*",
.method = HTTP_GET,
.handler = channel_get_handler,
.user_ctx = NULL,
.is_websocket = true

};

static void stop_webserver(httpd_handle_t server)
{
// Stop the httpd server
httpd_stop(server);
}

static httpd_handle_t start_webserver(void)
{
httpd_handle_t start_server = NULL;
httpd_config_t config = HTTPD_DEFAULT_CONFIG();
config.server_port = 80;
config.stack_size = 8192;
config.lru_purge_enable =true;
config.max_uri_handlers =5;
// Start the httpd server
config.uri_match_fn = httpd_uri_match_wildcard;
ESP_LOGI(TAG, "Starting server on port: '%d'", config.server_port);
if (httpd_start(&start_server, &config) == ESP_OK)
{
// Registering the ws handler
ESP_LOGI(TAG, "Registering URI handlers");
httpd_register_uri_handler(start_server, &timer);
httpd_register_uri_handler(start_server, &ctrl);
httpd_register_uri_handler(start_server, &page);
return start_server;
}

ESP_LOGI(TAG, "Error starting server!");
return NULL;

}

static void disconnect_handler(void * arg, esp_event_base_t event_base, int32_t event_id, void * event_data)
{
httpd_handle_t * server = (httpd_handle_t *) arg;
if (*server)
{
stop_webserver(*server);
*server = NULL;
}
}
static void connect_handler(void * arg, esp_event_base_t event_base, int32_t event_id, void * event_data)
{
httpd_handle_t * server = (httpd_handle_t *) arg;
if (*server == NULL)
{
ESP_LOGI(TAG, "Starting webserver");
*server = start_webserver();
}
}

void ir_http_init()
{
static httpd_handle_t server = NULL;
esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &connect_handler, &server);
esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED, &disconnect_handler, &server);
server = start_webserver();
}

2. Initialize spiffs and Create a thread to read the contents of uart
   3.Then after trying to restart the device 100 times, the error occurred on the 64th time.The following error content
   I (4330) WEB-SOCKET: Starting server on port: '80'
   I (4330) WEB-SOCKET: Registering URI handlers
   (4330) main_task: Returned from app_main()
   I (4580) message: period_500ms_count value is 4
   I (5580) message: period_500ms_count value is 5
   I (6580) message: period_500ms_count value is 6
   I (7580) message: period_500ms_count value is 7
   I (8580) message: period_500ms_count value is 8
   I (9580) message: period_500ms_count value is 9
   I (10580) message: period_500ms_count value is 10
   I (11580) message: period_500ms_count value is 11
   I (11580) message: Cleaning value not erase_flash.........
   E (11590) httpd: httpd_server: error in select (9)
   W (11590) httpd_sess: enum_function: Closing invalid socket -1
   W (11600) httpd_sess: enum_function: Closing invalid socket -1
   W (11600) httpd_sess: enum_function: Closing invalid socket -1
   W (11610) httpd_sess: enum_function: Closing invalid socket -1
   W (11620) httpd_sess: enum_function: Closing invalid socket -1
   W (11620) httpd_sess: enum_function: Closing invalid socket -1
   W (11630) httpd_sess: enum_function: Closing invalid socket -1
   E (11640) httpd: httpd_server: error in select (9)
   W (11640) httpd_sess: enum_function: Closing invalid socket -1
   W (11650) httpd_sess: enum_function: Closing invalid socket -1
   W (11650) httpd_sess: enum_function: Closing invalid socket -1
   W (11660) httpd_sess: enum_function: Closing invalid socket -1
   W (11670) httpd_sess: enum_function: Closing invalid socket -1
   W (11670) httpd_sess: enum_function: Closing invalid socket -1
   W (11680) httpd_sess: enum_function: Closing invalid socket -1
   E (11690) httpd: httpd_server: error in select (9)
   W (11690) httpd_sess: enum_function: Closing invalid socket -1
   W (11700) httpd_sess: enum_function: Closing invalid socket -1
   W (11710) httpd_sess: enum_function: Closing invalid socket -1
   W (11710) httpd_sess: enum_function: Closing invalid socket -1
   W (11720) httpd_sess: enum_function: Closing invalid socket -1
   W (11720) httpd_sess: enum_function: Closing invalid socket -1
   W (11730) httpd_sess: enum_function: Closing invalid socket -1
   E (11740) httpd: httpd_server: error in select (9)
   W (11740) httpd_sess: enum_function: Closing invalid socket -1
   W (11750) httpd_sess: enum_function: Closing invalid socket -1
   W (11760) httpd_sess: enum_function: Closing invalid socket -1
   W (11760) httpd_sess: enum_function: Closing invalid socket -1
   W (11770) httpd_sess: enum_function: Closing invalid socket -1
   W (11780) httpd_sess: enum_function: Closing invalid socket -1
   W (11780) httpd_sess: enum_function: Closing invalid socket -1
   E (11790) httpd: httpd_server: error in select (9)
   W (11790) httpd_sess: enum_function: Closing invalid socket -1
   W (11800) httpd_sess: enum_function: Closing invalid socket -1
   W (11810) httpd_sess: enum_function: Closing invalid socket -1
   W (11810) httpd_sess: enum_function: Closing invalid socket -1
   W (11820) httpd_sess: enum_function: Closing invalid socket -1
   W (11830) httpd_sess: enum_function: Closing invalid socket -1
   W (11830) httpd_sess: enum_function: Closing invalid socket -1
   E (11840) httpd: httpd_server: error in select (9)
   W (11850) httpd_sess: enum_function: Closing invalid socket -1
   W (11850) httpd_sess: enum_function: Closing invalid socket -1
   W (11860) httpd_sess: enum_function: Closing invalid socket -1
   W (11860) httpd_sess: enum_function: Closing invalid socket -1
   W (11870) httpd_sess: enum_function: Closing invalid socket -1
   W (11880) httpd_sess: enum_function: Closing invalid socket -1
   W (11880) httpd_sess: enum_function: Closing invalid socket -1
   E (11890) httpd: httpd_server: error in select (9)
   W (11900) httpd_sess: enum_function: Closing invalid socket -1
   W (11900) httpd_sess: enum_function: Closing invalid socket -1
   W (11910) httpd_sess: enum_function: Closing invalid socket -1
   W (11920) httpd_sess: enum_function: Closing invalid socket -1
   W (11920) httpd_sess: enum_function: Closing invalid socket -1
   W (11930) httpd_sess: enum_function: Closing invalid socket -1
   W (11940) httpd_sess: enum_function: Closing invalid socket -1
   E (11940) httpd: httpd_server: error in select (9)
   W (11950) httpd_sess: enum_function: Closing invalid socket -1
   W (11950) httpd_sess: enum_function: Closing invalid socket -1
   W (11960) httpd_sess: enum_function: Closing invalid socket -1
   W (11970) httpd_sess: enum_function: Closing invalid socket -1
   W (11970) httpd_sess: enum_function: Closing invalid socket -1
   W (11980) httpd_sess: enum_function: Closing invalid socket -1
   W (11990) httpd_sess: enum_function: Closing invalid socket -1
   E (11990) httpd: httpd_server: error in select (9)
   W (12000) httpd_sess: enum_function: Closing invalid socket -1
   W (12010) httpd_sess: enum_function: Closing invalid socket -1
   W (12010) httpd_sess: enum_function: Closing invalid socket -1
   W (12020) httpd_sess: enum_function: Closing invalid socket -1
   W (12020) httpd_sess: enum_function: Closing invalid socket -1
   W (12030) httpd_sess: enum_function: Closing invalid socket -1
   W (12040) httpd_sess: enum_function: Closing invalid socket -1
   E (12040) httpd: httpd_server: error in select (9)
   W (12050) httpd_sess: enum_function: Closing invalid socket -1
   W (12060) httpd_sess: enum_function: Closing invalid socket -1
   W (12060) httpd_sess: enum_function: Closing invalid socket -1
   W (12070) httpd_sess: enum_function: Closing invalid socket -1
   W (12080) httpd_sess: enum_function: Closing invalid socket -1
   W (12080) httpd_sess: enum_function: Closing invalid socket -1
   W (12090) httpd_sess: enum_function: Closing invalid socket -1
   E (12100) httpd: httpd_server: error in select (9)
   W (12100) httpd_sess: enum_function: Closing invalid socket -1
   W (12110) httpd_sess: enum_function: Closing invalid socket -1
   W (12110) httpd_sess: enum_function: Closing invalid socket -1
   W (12120) httpd_sess: enum_function: Closing invalid socket -1
   W (12130) httpd_sess: enum_function: Closing invalid socket -1
   W (12130) httpd_sess: enum_function: Closing invalid socket -1
   W (12140) httpd_sess: enum_function: Closing invalid socket -1
   E (12150) httpd: httpd_server: error in select (9)
   W (12150) httpd_sess: enum_function: Closing invalid socket -1
   W (12160) httpd_sess: enum_function: Closing invalid socket -1
   W (12160) httpd_sess: enum_function: Closing invalid socket -1
   W (12170) httpd_sess: enum_function: Closing invalid socket -1
   W (12180) httpd_sess: enum_function: Closing invalid socket -1
   W (12180) httpd_sess: enum_function: Closing invalid socket -1
   W (12190) httpd_sess: enum_function: Closing invalid socket -1
   E (12200) httpd: httpd_server: error in select (9)
   W (12200) httpd_sess: enum_function: Closing invalid socket -1
   W (12210) httpd_sess: enum_function: Closing invalid socket -1
   W (12220) httpd_sess: enum_function: Closing invalid socket -1
   W (12220) httpd_sess: enum_function: Closing invalid socket -1
   W (12230) httpd_sess: enum_function: Closing invalid socket -1
   W (12240) httpd_sess: enum_function: Closing invalid socket -1
   W (12240) httpd_sess: enum_function: Closing invalid socket -1
   E (12250) httpd: httpd_server: error in select (9)
   W (12250) httpd_sess: enum_function: Closing invalid socket -1
   W (12260) httpd_sess: enum_function: Closing invalid socket -1
   W (12270) httpd_sess: enum_function: Closing invalid socket -1
   W (12270) httpd_sess: enum_function: Closing invalid socket -1
   W (12280) httpd_sess: enum_function: Closing invalid socket -1
   W (12290) httpd_sess: enum_function: Closing invalid socket -1
   W (12290) httpd_sess: enum_function: Closing invalid socket -1
   E (12300) httpd: httpd_server: error in select (9)
   W (12300) httpd_sess: enum_function: Closing invalid socket -1
   W (12310) httpd_sess: enum_function: Closing invalid socket -1
   W (12320) httpd_sess: enum_function: Closing invalid socket -1
   W (12320) httpd_sess: enum_function: Closing invalid socket -1
   W (12330) httpd_sess: enum_function: Closing invalid socket -1
   W (12340) httpd_sess: enum_function: Closing invalid socket -1
   W (12340) httpd_sess: enum_function: Closing invalid socket -1
   E (16580) task_wdt: Task watchdog got triggered. The following tasks/users did not reset the watchdog in time:
   E (16580) task_wdt: - IDLE (CPU 0)
   E (16580) task_wdt: Tasks currently running:
   E (16580) task_wdt: CPU 0: httpd
   E (16580) task_wdt: Print CPU 0 (current core) registers
   Stack dump detected
   Core 0 register dump:
   MEPC : 0x4038ad6a RA : 0x4038fe52 SP : 0x3fcd39e0 GP : 0x3fc95200
   0x4038ad6a: xQueueSemaphoreTake at /Users/ko_hon/tool/esp-idf/components/freertos/FreeRTOS-Kernel/queue.c:1657
   0x4038fe52: esp_log_impl_lock_timeout at /Users/ko_hon/tool/esp-idf/components/log/log_freertos.c:48

TP : 0x3fc9607c T0 : 0x420f7430 T1 : 0x4200540a T2 : 0xffffffff
0x420f7430: httpd_sess_delete_invalid at /Users/ko_hon/tool/esp-idf/components/esp_http_server/src/httpd_sess.c:347
0x4200540a: esp_vfs_close at /Users/ko_hon/tool/esp-idf/components/vfs/vfs.c:516

S0/FP : 0x3fca7000 S1 : 0x3fcd3a7c A0 : 0x3fca981c A1 : 0x00000001
A2 : 0x3c163f90 A3 : 0x00000004 A4 : 0x00000002 A5 : 0x00000001
A6 : 0xffffffff A7 : 0x0000000a S2 : 0x00000002 S3 : 0x3c163f48
S4 : 0x420f6000 S5 : 0x3c164000 S6 : 0x3c163000 S7 : 0x00000000
0x420f6000: esp_http_client_perform at /Users/ko_hon/tool/esp-idf/components/esp_http_client/esp_http_client.c:1326

S8 : 0x00000000 S9 : 0x00000000 S10 : 0x00000000 S11 : 0x00000000
T3 : 0x00000000 T4 : 0x00000000 T5 : 0x00000000 T6 : 0x00000000
MSTATUS : 0x3fc94cb0 MTVEC : 0x3fca4060 MCAUSE : 0x00000037 MTVAL : 0x00000001
MHARTID : 0x00000000
W (16580) httpd_sess: enum_function: Closing invalid socket -1
E (16690) httpd: httpd_server: error in select (9)

[wolen666]

The git branch I use is commit e3e112e (HEAD -> release/v5.1, origin/release/v5.1)