Hi,
I have tested the same code by running in BF609-EZKit lite. No such problem occurs.
So I doubt in my custom board design. and also ,During the exception, stack pointer is corrupted. it is 0x7FA0 or 0xFBA0 instead of 0xFFA0.
will it be there any power shortage or fluctuation causing the problem?
Running core1 requires more current than being in Idle?