Guys,
I've had this Fatal signal 11 (SIGSEGV) error in my application as well.
In short I think this is what caused it for me:
I have two graphics layers and one AGOL layer. If for any reason the AGOL layer does NOT load then the application throws Fatal signal 11 (SIGSEGV) error and crashes immediately.
This is happening on Android 10.2.3 ArcGIS SDK.
Regards,
Deon