r0 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000040)='net/dev_mcast\x00')
preadv(r0, &(0x7f0000000000)=[{&(0x7f0000000080)=""/98, 0xfffffea6}], 0x1, 0x5, 0x0)