ESP32 Forum

Posted: **Sat Jul 22, 2023 11:09 pm**

I have recently upgraded my IDF from version 5.0.2 to 5.1. If ALPN is enabled then my server crashes on the first request to the server. It does not matter witch URI I do a request to. If ALPN is disabled everything works fine but the requests are slow (expected). The example in the IDF does work.

Panics regardless if I am in STA or AP mode.

Any advice?

I am using a ESP32-S3-WROOM-xx-xx.

This is the function that it Panics on.

Code: Select all

int mbedtls_ssl_conf_alpn_protocols(mbedtls_ssl_config *conf, const char **protos)

Server config

Code: Select all

    httpd_ssl_config_t config;
    memset(&config,0,sizeof(httpd_config_t));

    config.httpd.task_priority      = 6;       
    config.httpd.stack_size         = 32768;                     
    config.httpd.core_id            = tskNO_AFFINITY;           
    config.httpd.server_port        = 0;                       
    config.httpd.ctrl_port          = 32769;                    
    config.httpd.max_open_sockets   = 4;                        
    config.httpd.max_uri_handlers   = 13;                        
    config.httpd.max_resp_headers   = 8;                        
    config.httpd.backlog_conn       = 5;                        
    config.httpd.lru_purge_enable   = true;                    
    config.httpd.recv_wait_timeout  = 5;                        
    config.httpd.send_wait_timeout  = 5;                        
    config.httpd.global_user_ctx = NULL;                        
    config.httpd.global_user_ctx_free_fn = NULL;                
    config.httpd.global_transport_ctx = NULL;
    config.httpd.global_transport_ctx_free_fn = NULL;
    config.httpd.enable_so_linger = false;
    config.httpd.linger_timeout = 0;
    config.httpd.keep_alive_enable = false;
    config.httpd.keep_alive_idle = 0;
    config.httpd.keep_alive_interval = 0;
    config.httpd.keep_alive_count = 0;
    config.httpd.open_fn = NULL;
    config.httpd.close_fn = NULL;                        
    config.httpd.uri_match_fn = NULL;
    config.httpd.enable_so_linger = false;

    config.servercert = servercert;                           
    config.servercert_len = servercert_len;                              
    config.cacert_pem = NULL;               
    config.cacert_len = 0;                  
    config.prvtkey_pem = prvtkey_pem;                          
    config.prvtkey_len = prvtkey_len;                             
    config.transport_mode = HTTPD_SSL_TRANSPORT_SECURE; 
    config.port_secure = 443;                           
    config.port_insecure = 0;
    config.session_tickets = false;
    config.use_secure_element = false;
    config.user_cb = NULL;
    config.ssl_userdata = NULL;
    config.cert_select_cb = NULL;


    return httpd_ssl_start(&_server, &config);

Print before panic

Code: Select all

I (9786) esp_https_server: performing session handshake

Panic dump

Code: Select all

Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.

Core  0 register dump:
PC      : 0x400556b4  PS      : 0x00060330  A0      : 0x82031e1a  A1      : 0x3fcbbf10
A2      : 0x00000169  A3      : 0x00000165  A4      : 0x000000ff  A5      : 0x0000ff00  
A6      : 0x00ff0000  A7      : 0xff000000  A8      : 0x42008bdc  A9      : 0x3fcbbbb0
0x42008bdc: heap_task(void*) at I:/workspace/NIOE/main/main.cpp:32

A10     : 0x00000009  A11     : 0xffffffff  A12     : 0x00000009  A13     : 0x00000000
A14     : 0x000001f4  A15     : 0x00000001  SAR     : 0x00000004  EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000169  LBEG    : 0x400556d5  LEND    : 0x400556e5  LCOUNT  : 0xffffffff  


Backtrace: 0x400556b1:0x3fcbbf10 |<-CORRUPTED




ELF file SHA256: 35e84d2bf8d54d54

Rebooting...

Posted: **Tue Sep 19, 2023 1:55 am**

Hi Binder,
Did you figure it out the solution? I'm also seeing exactly same thing.
Thanks.

Posted: **Wed Sep 20, 2023 7:53 am**

Please ensure that `alpn_protos` resides in the global memory and not declared locally on stack. This problem could occur if the buffer is placed on stack and then it goes out of the scope. Quick fix could be to add `static` attribute to its definition and see if it helps.

If this does not help then please share the sample code and will evaluate it further.

Thanks.

ESP32 Forum

ALPN protos causing HTTPS server to crash

ALPN protos causing HTTPS server to crash

Re: ALPN protos causing HTTPS server to crash

Re: ALPN protos causing HTTPS server to crash