syz_mount_image$ext4(0x0, &(0x7f0000000340)='./file0\x00', 0x0, 0x0, 0x0, 0x0, 0x0)
mount(0x0, &(0x7f00000004c0)='./file0\x00', &(0x7f0000000000)='cgroup2\x00', 0x0, 0x0)
r0 = open(&(0x7f0000000180)='./file0\x00', 0x0, 0x0)
r1 = openat$cgroup_subtree(r0, &(0x7f00000002c0), 0x2, 0x0)
write(r1, &(0x7f00000003c0)="b5", 0x1)