There's some more info in the forwarded upstream bug, but nobody has so far been able to reproduce it. (See [1].)
Somebody thought this miiiiight be a locking issue introduced in the botan update, but no hard facts. [1] https://github.com/PowerDNS/pdns/issues/3954 -- ,''`. Christian Hofstaedtler <z...@debian.org> : :' : Debian Developer `. `' 7D1A CFFA D9E0 806C 9C4C D392 5C13 D6DB 9305 2E03 `-
