r0 = syz_open_procfs(0x0, &(0x7f0000000080)='net/dev_mcast\x00')
readv(r0, &(0x7f0000000480)=[{&(0x7f00000000c0)=""/204, 0xcc}, {&(0x7f0000000240)=""/118, 0x76}, {&(0x7f00000002c0)=""/216, 0xd8}], 0x3)