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Test user.* xattr operations on sockets from different address families: AF_INET, AF_INET6, AF_NETLINK, and AF_PACKET. All socket types use sockfs for their inodes, so user.* xattrs should work regardless of address family. Each fixture creates a socket (no bind needed) and verifies the full fsetxattr/fgetxattr/flistxattr/fremovexattr cycle. AF_INET6 skips if not supported; AF_PACKET skips if CAP_NET_RAW is unavailable. Also tests abstract namespace AF_UNIX sockets, which live in sockfs (not on a filesystem) and should support user.* xattrs. Link: https://patch.msgid.link/20260216-work-xattr-socket-v1-14-c2efa4f74cb7@kernel.org Acked-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org>