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5a89175ac8
A SRV record keeps a reference on the corresponding additional record, if any. But this additional record is also inserted in a separate linked-list into the dns response. The problems arise when obsolete additional records are released. The additional records list is purged but the SRV records always reference these objects, leading to an undefined behavior. Worst, this happens very quickly because additional records are never renewed. Thus, once received, an additional record will always expire. Now, the addtional record are only associated to a SRV record or simply ignored. And the last version is always used. This patch helps to fix the issue #841. It must be backported to 2.2.