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System crash with all core registers value as 0xFFFFFFFF

Question asked by zhang.biao.001 on Aug 17, 2015
Latest reply on Aug 17, 2015 by Clive One
I have a system(freeRTOS) running well on stm32f401 platform. To reduce the PowerConsumption, i added a HAL_PWR_EnterSLEEPMode() into the void vApplicationIdleHook( void ). The system will crash in seconds with all core cpu registers(R0-R12, SP LR) value as 0xFFFFFFFF.
1) What kind of error causes it?
2) How to even start to debug this issue?