How to store panic information to flash?

[yanshay]

I'd like to store information shown on panic / exception (which I believe generated by esp-backtrace) to flash, so after reboot I can fetch it and understand what happened (since device is not connected to logs).

How can I do that?

I could copy the panic handler in esp-backtrace and modify it but it uses non public functions, and also I need to pass the access to the flash to the panic handler somehow. So I wonder if there's any recommended approach to do what I'm trying to do (which seems pretty useful to debug issues when there is no logger connected)