Florian Westphal wrote: > Which nft and libnftnl versions are this? > > This code is taken for non-anon sets. > > Note the ! -- this check is done for named sets. I'm totally confused and ashamed right now. Of course that code is only taken for named sets. And trying to reproduce the bug again, it works flawlessly with the exact . So either this is a Heisenbug, or I was even more confused when writing my original mail. I cannot tell. In case it matters anyway: This happened (and then worked) on Debian Buster, libnl-3-200 version 3.4.0-1 and nftables version 0.9.0-2 Sorry to waste your time! -- Jan-Philipp Litza PLUTEX GmbH Hermann-Ritter-Str. 108 28197 Bremen Hotline: 0800 100 400 800 Telefon: 0800 100 400 821 Telefax: 0800 100 400 888 E-Mail: support@xxxxxxxxx Internet: http://www.plutex.de USt-IdNr.: DE 815030856 Handelsregister: Amtsgericht Bremen, HRB 25144 Geschäftsführer: Torben Belz, Hendrik Lilienthal