r0 = memfd_create(&(0x7f0000000000)=':^/\x00', 0x7)
ftruncate(r0, 0x8800000)
preadv(r0, &(0x7f0000000100)=[{&(0x7f0000000040)=""/40, 0x28}], 0x1, 0xfffffffa, 0x0)