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RTOSv2+STM32+STOP mode

Hello,

I am using CMSIS RTOSv2 running on a STM32F407 and I am trying to use the low-power STOP mode to put the micro and system to sleep and save power. When the system exits the STOP mode, via an interrupt, and then calls osDelay() a system Hardfault, INVPC, occurs. Functions that use osDelay() before entering STOP mode work as expected, but the same functions called after exiting STOP mode will Hardfault at the osDelay() call.

I am not calling osDelay() from an interrupt(been burned by that before).

I have struggled to find any examples or guides to using a low-power mode while using the CMSIS RTOS library. Do I have to prepare the RTOS for this 'hardware' low-power STOP mode?

Thank you in advance,
Tim