What happens when tried to free memory allocated by heap manager, which allocates more than asked for?

Yes, that's what happens almost every time do you a malloc() . The malloc block header contains information about the the size of the block, and when free() is called, it returns that amount back to the heap. It's not faulty, it's expected operation.

Yes, the heap manager is allowed to return a block of more than n bytes. It is completely safe (and required!) to free the returned pointer using free, and free will deallocate all of it.

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