Crashing for unknown reason

[raako71]

Platform

ESP32

IDE / Tooling

Arduino (IDE/CLI)

What happened?

I have found an issue where the system will panic and crash

Stack Trace

corrupted.

Minimal Reproductible Example (MRE)

This command will cause a system panic when buffer is too large (8192 was the value in my case), before any clients are connected: ws.textAll(buffer);
This is the Eth example with the problematic function included.

`
#include <ETH.h>
#include <ESPAsyncWebServer.h>

static AsyncWebServer server(80);
static bool eth_connected = false;
static AsyncWebSocket ws("/ws");

// WARNING: onEvent is called from a separate FreeRTOS task (thread)!
void onEvent(arduino_event_id_t event) {
switch (event) {
case ARDUINO_EVENT_ETH_START:
Serial.println("ETH Started");
// The hostname must be set after the interface is started, but needs
// to be set before DHCP, so set it from the event handler thread.
ETH.setHostname("esp32-ethernet");
break;
case ARDUINO_EVENT_ETH_CONNECTED: Serial.println("ETH Connected"); break;
case ARDUINO_EVENT_ETH_GOT_IP:
Serial.println("ETH Got IP");
Serial.println(ETH);
eth_connected = true;
break;
case ARDUINO_EVENT_ETH_LOST_IP:
Serial.println("ETH Lost IP");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_DISCONNECTED:
Serial.println("ETH Disconnected");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_STOP:
Serial.println("ETH Stopped");
eth_connected = false;
break;
default: break;
}
}

void testClient(const char *host, uint16_t port) {
Serial.print("\nconnecting to ");
Serial.println(host);

NetworkClient client;
if (!client.connect(host, port)) {
Serial.println("connection failed");
return;
}
client.printf("GET / HTTP/1.1\r\nHost: %s\r\n\r\n", host);
while (client.connected() && !client.available());
while (client.available()) {
Serial.write(client.read());
}

Serial.println("closing connection\n");
client.stop();
}

void setup() {
Serial.begin(115200);
Network.onEvent(onEvent);
ETH.begin(ETH_PHY_LAN8720, 0, 23, 18, 5, ETH_CLOCK_GPIO17_OUT);
}

void loop() {
if (eth_connected) {
testClient("google.com", 80);
char buffer[8192];
ws.textAll(buffer);
}
delay(10000);
}
`

I confirm that:

• I have read the documentation.
• I have searched for similar discussions.
• I have searched for similar issues.
• I have looked at the examples.
• I have upgraded to the lasted version of ESPAsyncWebServer (and AsyncTCP for ESP32).