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Test thread-safety of tld_create_key(). Since tld_create_key() does not rely on locks but memory barriers and atomic operations to protect the shared metadata, the thread-safety of the function is non-trivial. Make sure concurrent tld_key_create(), both valid and invalid, can not race and corrupt metatada, which may leads to TLDs not being thread- specific or duplicate TLDs with the same name. Signed-off-by: Amery Hung <ameryhung@gmail.com> Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com> Link: https://lore.kernel.org/r/20250730185903.3574598-5-ameryhung@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>