prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x0, 0x0, &(0x7f0000001b00))
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000700)={<r0=>0xffffffffffffffff, <r1=>0xffffffffffffffff})
write$nbd(r1, &(0x7f0000000540)=ANY=[], 0x83)
recvmsg(r0, &(0x7f0000000240)={0x0, 0x0, 0x0}, 0x0)