socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000040)={<r0=>0xffffffffffffffff, <r1=>0xffffffffffffffff})
writev(r0, &(0x7f0000000400)=[{&(0x7f0000000000)='S', 0x1}], 0x1)
ioctl$sock_SIOCETHTOOL(r1, 0x541b, &(0x7f0000000080)={'nr0\x00', 0x0})