Hardfault for simple freeRTOS application

Following is a simple application that I have created. It has no softdevice and the configuration is very similar to blinky freeRTOS example.

Source code:

main.c

All tasks are activated once but then I get a hardfault and it is rather tedious to debug this on gcc/eclipse environment as I get no stack trace for the hard fault.

Kindly let me know what could be wrong?

EDIT : All functions RT_RE_xxxxxxxxxx are blank functions.