r0 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000040)='net/mcfilter6\x00')
preadv(r0, &(0x7f0000000240)=[{&(0x7f0000000200)=""/61, 0x3d}], 0x1, 0xffffffff, 0x0)