socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000000)={<r0=>0xffffffffffffffff})
r1 = socket$inet_udp(0x2, 0x2, 0x0)
dup3(r0, r1, 0x0)
r2 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000080)='/proc/vmallocinfo\x00', 0x0, 0x0)
sendfile(r1, r2, 0x0, 0xffe6)