Description
Strange thing - I try to get a function for the user to download the core dump from the coredump partition. During loading the data I faced an issue and get contiously core-dumps.
I'm developing on a standard ESP32-Wroom32.
The code is slightly changed for debugging purposes. The buffer is initialized by a for-loop to better check for valid data. First the capture list was only by reference [&] but then I saw that my buffer (data[]) was modified. Then I changed the capture-list to const reference. This leads to a reproduceable state where the ESP reboots.
Code snippet
void getCoreDump(AsyncWebServerRequest *request) {
const esp_partition_t *partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_DATA_COREDUMP, "coredump");
if (partition != NULL) {
size_t size = partition->size;
uint8_t *data = new uint8_t[size];
// must be separate from transfer - otherwise it failes during read
//if (ESP_OK != esp_partition_read(partition, 0, data, size))
// DPRINTLN(DBG_ERROR, F("can't read partition"));
for(int i = 0; i < size; i++) {
data[i] = i % 256;
}
AsyncWebServerResponse *response = request->beginResponse("application/octet-stream", size, [&data, &size](uint8_t *buffer, size_t maxLen, size_t index) -> size_t {
if((index + maxLen) > size)
maxLen = size - index;
DPRINTLN(DBG_INFO, "maxLen: " + String(maxLen)); // without this, the ESP crahses!?
memcpy(buffer, &data[index], maxLen);
if((index + maxLen) == size)
delete[] data;
return maxLen;
});
response->addHeader("Content-Description", "File Transfer");
response->addHeader("Content-Disposition", "attachment; filename=coredump.bin");
request->send(response);
} else {
AsyncWebServerResponse *response = request->beginResponse(200, F("application/json; charset=utf-8"), "{}");
request->send(response);
}
}once I call my ESP with [IP]/coredump the following stacktrace will be printed
Core Dump
Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x4019bc71 PS : 0x00060630 A0 : 0x8012908d A1 : 0x3ffb30f0
A2 : 0x8d11cd38 A3 : 0x00000006 A4 : 0x00000014 A5 : 0x0000ffff
A6 : 0x00000000 A7 : 0x00000001 A8 : 0x00000002 A9 : 0x0000ff00
A10 : 0x00ff0000 A11 : 0x3ffdf898 A12 : 0x00000001 A13 : 0x00000002
A14 : 0x00000000 A15 : 0x00000001 SAR : 0x00000019 EXCCAUSE: 0x0000001c
EXCVADDR: 0x8d11cd38 LBEG : 0x4008a234 LEND : 0x4008a24a LCOUNT : 0xffffffff
Backtrace: 0x4019bc6e:0x3ffb30f0 0x4012908a:0x3ffb3110 0x4012936a:0x3ffb3130 0x4012a956:0x3ffb3160 0x4012f97a:0x3ffb31d0 0x401339c6:0x3ffb3200 0x401248c5:0x3ffb3220
#0 0x4019bc6e:0x3ffb30f0 in pbuf_clen at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/pbuf.c:824
#1 0x4012908a:0x3ffb3110 in tcp_free_acked_segments at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp_in.c:1113
#2 0x4012936a:0x3ffb3130 in tcp_receive at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp_in.c:1289 (discriminator 4)
#3 0x4012a956:0x3ffb3160 in tcp_process at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp_in.c:987
(inlined by) tcp_input at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/tcp_in.c:438
#4 0x4012f97a:0x3ffb31d0 in ip4_input at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/core/ipv4/ip4.c:803
#5 0x401339c6:0x3ffb3200 in ethernet_input at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/netif/ethernet.c:186
#6 0x401248c5:0x3ffb3220 in tcpip_thread_handle_msg at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/api/tcpip.c:180
(inlined by) tcpip_thread at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/lwip/lwip/src/api/tcpip.c:154
ELF file SHA256: e63468b51f8e834c
Rebooting...
Your documentation:
https://github.com/esphome/ESPAsyncWebServer/blob/main/README.md#respond-with-content-using-a-callback-containing-templates-and-extra-headers
Is there anything I'm missing? Don't know where the issue is related to.