$ dd [...] bs=1 count=1
[...]
read(0, "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"..., 1) = 86

Explanation: dd is ran with parameters telling it to read only 1 (one) byte, it calls the read syscall asking for only 1 (one) byte, then the syscall... proceed to return 86 bytes

@multisn8 this unit is playing with kernel out-of-tree module dev and did a silly when writing the read() op implementation