socketpair$unix(0x1, 0x2, 0x0, &(0x7f00000000c0)={0xffffffffffffffff, <r0=>0xffffffffffffffff})
setreuid(0x0, 0xee01)
ioctl$sock_ifreq(r0, 0x8971, &(0x7f0000000000)={'macvtap0\x00', @ifru_mtu})