Solved
Signal Handler Called at 0xFFFFFFF9
My code gets complied without any errors. But just before the uploading completes:
<signal handler> called at 0xfffffff9 is displayed.
Even though after that my code runs properly without any hardfault.
0xFFFFFFF9 suggests an interrupt is called but the interrupt table is incorrect or erased. Probably the debugger is in an intermediate state.
If things are working, I wouldn't bother with it.
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