STM32F446 Allocation/Crash hardfault exception : Exception occured at PC = 0xfffffffe, LR = 0xfffffff9

My Mcu platform is STM32F446(512K)

I allocate a function(selfTest) at specific address , mcu will crash after perform "printf" function and show hard fault.

hardfault exception : Exception occured at PC = 0xfffffffe, LR = 0xfffffff9

allocation address : i try to allocate at @0x0803550 or @0x080550 or @0x0801550

if I cancel allocation setting in .icf , selfTest function allocation by compiler and linker.

MCU can work normally, and perform printf() is also no problem.

how can i fixed this issue?

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