r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
r1 = fcntl$dupfd(r0, 0x0, r0)
setsockopt$inet_buf(r1, 0x0, 0x29, &(0x7f0000000040)="ed9292d1ba61c210097106a64a2fadb4", 0x20000)