shello"SKS Keyserver Network Under Attack"
https://gist.github.com/rjhansen/67ab921ffb4084c865b3618d6955275f
TL;DR: The SKS keyservers are designed to be append-only, and they are being abused with large amounts of signatures on some keys. GnuPG has trouble dealing with that many signatures, and the mere action of importing or refreshing the trust DB with one of these keys breaks your installation, and it becomes a mess to use and fix. The workaround in the short/medium term is to stop using SKS keyservers altogether.
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