What were you trying to do that didn't work?

nft expression fib saddr . iif oif exists

doesn't work on s390x

Please provide the package NVR for which the bug is seen:

nftables-1.1.1-5.el10.s390x
6.12.0-124.el10.s390x

How reproducible is this bug?:

always

Steps to reproduce

1. Run the reproducer attatched.
2.  
3.  

Expected results

Actual results

Expression: fib saddr . iif oif exists doesn't work on s390x.
Run the script attached.
Neither "missing" nor "exists" rule get matched

table ip filter {
        chain prerouting {
                type filter hook prerouting priority filter; policy accept;
                icmp type echo-request fib saddr . iif oif missing counter packets 0 bytes 0
                icmp type echo-request fib saddr . iif oif exists counter packets 0 bytes 0
        }
}