Your crack would appear to be along the joint line of two (or more) sheets of drywall. Simply filling the crack with mud and repainting will not fix it. Most likely, the crack has opened up due to movement in the structural framing above the sheetrock. To properly address this, the entire area along the crack should be opened up, and find what is "loose" up above. Once that is addressed, new sheetrock can be installed, properly attached to secure framing members, re-taped, textured, and painted. This is not a job for the faint of heart...i.e., might be time to hire a good drywall pro.
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