Hi, With the following linux-image packages installed:
linux-image-4.19.0-21-amd64/oldoldstable,now 4.19.249-2 amd64 [installed,auto-removable] linux-image-4.19.0-26-amd64/oldoldstable,now 4.19.304-1 amd64 [installed] linux-image-4.19.0-27-amd64/oldoldstable,now 4.19.316-1 amd64 [installed,automatic] linux-image-amd64/oldoldstable,now 4.19+105+deb10u22 amd64 [installed] (& nftables/oldoldstable,now 0.9.0-2 amd64 [installed]) when booted in to -21 or -26, this command completes successfully: # nft add set ip filter demo { type ipv4_addr \; flags interval \; elements = { 1.1.1.1, 1.1.1.2 } } But, when booted in to -27, it errors with: Error: Could not process rule: Directory not empty add set ip filter demo { type ipv4_addr ; flags interval ; elements = { 1.1.1.1, 1.1.1.2 } } ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The following short script reliably reproduces the issue when executed as root: -=- nft flush ruleset nft add table ip filter nft add set ip filter demo { type ipv4_addr \; flags interval \; elements = { 1.1.1.1, 1.1.1.2 } } nft list ruleset -=- I observe that: * Without 'flags interval', the set loads successfully. * If the two elements are not adjacent, the set loads successfully. (eg 'elements = { 1.1.1.1, 1.1.1.3 }' ) with thanks, Graham