Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)

[Andrew Lunn]

> What else can I try?

Do you have transparent huge pages enabled?

~$ cat /sys/kernel/mm/transparent_hugepage/enabled 
[always] madvise never

If so, could you disable it with:

echo never > /sys/kernel/mm/transparent_hugepage/enabled

and run your rsync command.

Thanks
        Andrew