socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000001000)={<r0=>0xffffffffffffffff, <r1=>0xffffffffffffffff})
sendmsg(r0, &(0x7f0000000400)={0x0, 0x0, &(0x7f0000000000)=[{&(0x7f0000001040)="ff", 0x1}], 0x1}, 0x0)
recvmmsg(r1, &(0x7f00000003c0), 0x2, 0x0, 0x0)