r0 = memfd_create(&(0x7f0000000340)='\x00', 0x0)
pwritev2(r0, &(0x7f0000001740)=[{&(0x7f00000000c0)='Z', 0x1}], 0x1, 0x0, 0x0, 0x0)
readv(r0, &(0x7f00000015c0)=[{&(0x7f0000001480)=""/28, 0x1c}], 0x1)