r0 = syz_open_procfs(0x0, &(0x7f0000000240)='map_files\x00')
mount_setattr(r0, &(0x7f0000000040)='./file0\x00', 0x0, &(0x7f0000000080)={0x0, 0x0, 0x80000}, 0x20)