Dear Michael,
Thank you for your response.

Finally the problem is stack overrides. Am I right? Please see below and confirm.

It is re-entrant. But array is local to function so it will be in stack segment. QNX has stack limit for thread in process.
Example: 9534 array of int, I.e  9k * 4 of stack size. So could be stack overrides.
Instead allocate stack as 32bytes and sufficient for p1 and p2.

In some cases, it is worth the effort to optimize the stack, particularly when the application has some frequent picks of stack activity (meaning that a huge stack segment would be constantly mapped to physical memory). We can watch the Memory Information view for stack allocation and inspect code that uses the stack heavily. This usually occurs in two cases: recursive calls (which should be avoided in embedded systems), and heavy usage of local variables (keeping arrays on the stack

Thanks, 
Ramu