Kernel outputting CL_UNKNOWN_ERROR

[lehrling]

Hello, Im developing a mode for an old file format. At some point in my code, I do something like;

Code:

__kernel function1() {
     struct mytype;
     function2(&mytype);
}

function2(struct *mytype) {
     uchar *ptr = mytype->value2;
     function3(ptr);
}

function3(byte* ptr) {
     uint16 v1 = 10;
     uint16* ptr2 = (uint16*) ptr;
     *ptr2 = v1 >> 8;
}


struct mytype {
      uchar value1[8];
      uchar value2[8];
      uint key[52];
      uint bufleft;
 }

This code fails at

Code:

*ptr2 = v1 >> 8;

with clWaitForEvents(): CL_UNKNOWN_ERROR. If I remove this single assignment, the code runs without errors. Does anybody has any tip on how to solve this problem?