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This commit adds two new test functions: one to reproduce the bug reported by syzkaller [1], and another to cover the calculation of copied_seq. The tests primarily involve installing and uninstalling sockmap on sockets, then reading data to verify proper functionality. Additionally, extend the do_test_sockmap_skb_verdict_fionread() function to support UDP FIONREAD testing. [1] https://syzkaller.appspot.com/bug?extid=06dbd397158ec0ea4983 Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev> Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com> Link: https://lore.kernel.org/r/20260124113314.113584-4-jiayuan.chen@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>