Version 1.5.1 of xdp-tools has a bug in libxdp which prevents creation of AF_XDP umem areas with the flags field set. This is a regression from previous versions, and there are known applications which use this flag that break with the updated version.

We already fixed the issue upstream and created a new point release with the fix and a unit test for the issue.

See the upstream report here for more details: https://github.com/xdp-project/xdp-tools/pull/477