Linux Thread Stack Size pthread_attr_setstacksize

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http://www.unix.com – I have MultiThreaded Application in Linux. I am Setting the stack size using pthread_attr_setstacksize. The stack size i set is greter than PTHREAD_STACK_MIN i.e. 16384 bytes for my system. i am setting the stack size to 17408 bytes, and my application crashes due to insufficient stack size. when i set the stack size to 17920 my application runs successfully. But from my gathered statistics from /proc/<MY PROCESS PID>/task/<TID>/stat , the maximum stack size per thread ( which is the difference of stack pointer and bottom of stack) is not greater than 8KB or 9KB , then why is the (HowTos)