r0 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000580)='net/udp6\x00')
preadv(r0, &(0x7f0000000000)=[{&(0x7f00000005c0)=""/4096, 0x1000}], 0x1, 0x0, 0x0)