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These callbacks can block a seastar thread and the underlying vector can be reallocated concurrently. This is no different than if it was a plain std::vector and the solution is similar: use values instead of references. Fixes #6230 Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com> Message-Id: <20200422182304.120906-1-espindola@scylladb.com>