aarch64 linux 4.4.1 Frozen screen

[haiyiyang007]

make android-arm KDIR=/lib/modules/uname -r/build HOOKRW=1
insmod suterusu.ko
phenomenon:
Frozen screen,
dmesg --clear && dmesg --follow have not any output.

analyze:
inline void arm_write_hook ( void *target, char *code )
{
memcpy(target, code, HIJACK_SIZE);
cacheflush(target, HIJACK_SIZE);
}
memcpy is root cause.
I am comfused, Would you help me to fix it?