selftests/bpf: Add regression test for queue/stack map size limit Verify that queue/stack maps whose element storage would overflow the u32 head/tail index multiplication are rejected at creation time, and that max_entries == U32_MAX (which would wrap the u32 capacity counter to 0) is rejected as well. Signed-off-by: Yuan Chen <chenyuan@kylinos.cn> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260831063226.621309-3-chenyuan_fl@163.com