MSP430 Code crossing 16-bit boundary

I have a project for the MSP430F6779A . I have been getting resets caused by a peripheral area fetch. If I comment out code that is not executed (yet), I found that I could make the crash go away. Further investigation showed that I could make the issue happen by adding a constant array that was 115 bytes long. Reducing the array to 112 bytes makes the issue go away. I looked a the symbol locations and noticed the folowing functions had crossed fro 16-bit addressable space to 20-bit addressable space:

    _ctl_byte_queue_post      
    _ctl_byte_queue_receive     
    _ctl_byte_queue_post_nb      
    _ctl_byte_queue_receive_nb    
    _ctl_private_get_stack_start                 
    _ctl_private_get_thread_local_storage                  
    _ctl_private_init_registers               
    _ctl_private_init_thread_local_storage                
    ___RAL_read_tp                
    _ctl_private_reschedule_from_api_call                
    _ctl_enter_isr                   
    _ctl_exit_isr             
    do_switch_if_needed                
    restore_registers            
    _ctl_global_interrupts_set                
    _enable_ints       
    _UCA1_init_UART

I have suspicions that the issue may be related to the _ctl_enter_isr and/or _ctl_exit_isr  functions changing locations. The crash does not happen immediately and seems to be associated with some code that causes UART interrupts or I2C interrupts. I have attached the symbol locations for both the working and non-working array sizes. What can I do to debug/fix this issue. It is very annoying.