[knot-dns-users] reverse malformed data

Hello, I have a problem with a new, small IPv6 reverse zone It's a small zone, configured like this : zone: - domain: "a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa." file: "a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa" notify: "corrin" acl: "acl_corrin" dnssec-signing: "off" module: mod-synthrecord/revovh2 There is data in the journal : root@arrakeen:/var/lib/knot/external# knotc zone-read a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa [a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa.] a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa. 2560 SOA ns.geekwu.org. hostmaster.a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa. 1580234956 16384 2048 1048576 2560 [a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa.] a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa. 259200 NS ns.geekwu.org. [a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa.] a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa. 259200 NS ns4.geekwu.org. [a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa.] 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa. 3600 PTR imperium.geekwu.org. [a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa.] 2.2.1.0.0.0.0.0.0.0.0.0.1.0.0.0.a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa. 3600 PTR git.geekwu.org. [a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa.] a.2.a.2.0.0.0.0.0.0.0.0.1.0.0.0.a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa. 3600 PTR corrin.geekwu.org. But if I change anything (like adding another host), on knotc reload I get this error : knotd[21892]: error: [a.8.1.a.8.0.0.0.0.d.1.4.1.0.0.2.ip6.arpa.] zone event 'load' failed (malformed data) I've purged the zone with zone-purge, replaced the zone file with a copy of the dump, and got a new record on reload, but further edits fails the same way I'm using knot 2.9.2-1~cz.nic~buster1 for deb.knot-dns.cz/knot-latest Do you have an idea on what's going on ? Thanks, -- Bastien Durel