You have to make it back under your own power and provide a fuel sample unless there is a technical reason as to why you can't make it back.
How good that reason is is up to the FIA to decide. RBR will have to tell the FIA exactly what happened and convince them they had to stop.
If the FIA are happy then no penalty, although I would assume something serious enough for them to allow them off with out a penalty will require fixing so will mean starting from the pits.
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