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Exercise the scenario described in detail in the cover letter: 1) socket A: connect() from ephemeral port X 2) socket B: explicitly bind() to port X 3) check that port X is now excluded from ephemeral ports 4) close socket B to release the port bind 5) socket C: connect() from ephemeral port X As well as a corner case to test that the connect-bind flag is cleared: 1) connect() from ephemeral port X 2) disconnect the socket with connect(AF_UNSPEC) 3) bind() it explicitly to port X 4) check that port X is now excluded from ephemeral ports Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com> Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> Link: https://patch.msgid.link/20250917-update-bind-bucket-state-on-unhash-v5-2-57168b661b47@cloudflare.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>