I figured the issue myself out. For anyone else having a similar issue: I was calling strtok with the version string from esp_app_desc_t which changed the version string. So when esp_ota_end was using it, the string was NULL. Copying the version string in a buffer and then calling strtok on the buff...

Hello everyone, I am trying to do an ota via modbus rtu. But after having written the image to flash with esp ota write(), the call to esp ota end makes the esp crash with "Guru Meditation Error: Core / (Cache disabled but cached memory region accessed). Write back error occurred while dcache tries ...