Strace log of busybox with "-t" argument

execve("/system/bin/busybox", ["busybox", "mount", "-t", "ext4", "/dev/block/loop3", "/mnt/ubuntu20-fs/"], 0xffa5160c /* 13 vars */) = 0
brk(NULL)                               = 0x435000
brk(0x435d2c)                           = 0x435d2c
set_tls(0x435490)                       = 0
brk(0x436ae8)                           = 0x436ae8
set_tls(0x4361c0)                       = 0
ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
statfs64("/sys/fs/selinux", 88, 0xffbbf680) = 0
statfs64("/sys/fs/selinux", 88, 0xffbbf130) = 0
stat64("/sys/fs/selinux", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
brk(0x437ae8)                           = 0x437ae8
brk(0x438000)                           = 0x438000
open("/proc/mounts", O_RDONLY)          = 3
ioctl(3, TCGETS, 0xffbbf074)            = -1 ENOTTY (Not a typewriter)
read(3, "rootfs / rootfs rw,seclabel,size"..., 4096) = 4002
stat64("/", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat64("/dev", {st_mode=S_IFDIR|0755, st_size=3000, ...}) = 0
stat64("/dev/pts", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat64("/proc", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat64("/sys", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat64("/sys/fs/selinux", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
close(3)                                = 0
getuid32()                              = 0
getuid32()                              = 0
geteuid32()                             = 0
stat64("/dev/block/loop3", {st_mode=S_IFBLK|0600, st_rdev=makedev(0x7, 0x3), ...}) = 0
mount("/dev/block/loop3", "/mnt/ubuntu20-fs/", "ext4", MS_SILENT, NULL) = -1 EINVAL (Invalid argument)
vfork()                                 = 18371
wait4(18371, NULL, 0, NULL)             = 18371
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=18371, si_uid=0, si_status=111, si_utime=0, si_stime=0} ---
write(2, "mount: mounting /dev/block/loop3"..., 79) = 79
exit_group(255)                         = ?
+++ exited with 255 +++