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In the known examples of flux vacua with calibrated spacetime-filling sources(branes or orientifold planes), one can smear the source in order to perform astandard KK reduction and obtain a lower-dimensional supergravity description.Furthermore, it is expected that the smeared and localized solution preserveequal amounts of supersymmetry. In this note we point out that the$\mathrm{AdS}_7$ solution discussed in arXiv:1111.2605 and arXiv:1309.2949 is acounterexample to this common lore. The solution is supersymmetric when thespacetime-filling D6-branes are localized but breaks supersymmetry in thesmeared limit. By using the embedding tensor formalism we demonstrate thatthere is no gauged supergravity description for the solution, regardless of thesource being smeared or not. We conjecture that for flux solutions withseparation between the KK scale and the AdS radius this cannot occur.

A note on smeared branes in flux vacua and gauged supergravity