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b087cf4a6c3dd4c323a099770a44c24812381bf4
We only need to order two server records on the ->serial field. Literal address records are smaller and don't have this field and don't need to be ordered on it. To actually provoke this bug seems to need the same server-literal to be repeated twice, eg --address=/a/1.1.1.1 --address-/a/1.1.1.1 which is clearly rare in the wild, but if it did exist it could provoke a SIGSEV. Thanks to Daniel Rhea for fuzzing this one.
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