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ARM: os_error & Clock Security System CSS on LSE

void os_error(uint32_t error_code)
OS_ERROR_TIMER_OVF

we are using STM32L152ZE.

We have enable CSS feature on LSE 32Khz. Once a failure is detected on LSE an os_error occurs with error code: OS_ERROR_TIMER_OVF : (The User Timer Callback Queue overflow is detected).

RTX Kernel Timer is based on Cortex-M3 Sys Tick Timer (which is linked to HSE) then why LSE failure causes os_error.

Comments appreciated.