LAUNCHXL-CC2640R2: program gets stuck in GATT_Notification

Hello,

I am using simple_peripheral on cc2640r2f. I tried to send notifications to Master but application was getting stop suddenly. While debugging i came to know that while sending the notification when the program enter 

to following section :

if (GATT_Notification(connHandle, &noti, FALSE) != SUCCESS)
 {
     GATT_bm_free((gattMsg_t *)&noti, ATT_HANDLE_VALUE_NOTI);
 }

if does not come back from the GATT_Notification function. During debugging i step in to it GATT_Notification. The program get stuck in section as shown below in figure:

The debugging log show the following at messages:

Tue Oct 24, 2017 11:49:43: The stack pointer for stack 'CSTACK' (currently 0x20001DB8) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:49:49: The stack pointer for stack 'CSTACK' (currently 0x20001D98) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:49:51: The stack pointer for stack 'CSTACK' (currently 0x20001D98) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:49:51: The stack pointer for stack 'CSTACK' (currently 0x20001D98) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:49:52: The stack pointer for stack 'CSTACK' (currently 0x20001D98) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:49:54: The stack pointer for stack 'CSTACK' (currently 0x20001D90) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:49:54: The stack pointer for stack 'CSTACK' (currently 0x20001D90) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:49:55: The stack pointer for stack 'CSTACK' (currently 0x20001D90) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:49:56: The stack pointer for stack 'CSTACK' (currently 0x20001D90) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:49:57: The stack pointer for stack 'CSTACK' (currently 0x20001D90) is outside the stack range (0x20003B70 to 0x20003F70)
Tue Oct 24, 2017 11:50:03: The stack pointer for stack 'CSTACK' (currently 0x20001D90) is outside the stack range (0x20003B70 to 0x20003F70)

It means that stack is not big enough. Am i right? or is there any other issue?

How i will come to know about the stack memory required by the task ?

I am using the simple_peripheral with

 #define SBP_TASK_STACK_SIZE                   644

How much maximum stack size i can allocate to a task?

Please help me to figure it out.

I will be waiting for your kind help.

Regards

MAbbas