r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
mmap(&(0x7f0000000000/0x1000)=nil, 0x1000, 0x0, 0x32, 0xffffffffffffffff, 0x0)
setsockopt$inet6_tcp_TCP_FASTOPEN_KEY(r0, 0x6, 0x21, &(0x7f0000000000)="f57665a44ad580b15acc109b5695b86e", 0x10)