Used 25% of memory, but the program restarts due to insufficient memory

Question

At the very beginning of the program in the main function, my stack pointer is 0x20026390, although I expected it to be in the 0x20040000 area. 
 In this case, static memory is used 26% - 35072 bytes. Those. my static memory should be in the memory area 0x20020000 - 0x20028900, it turns out that I have already crossed the memory boundary by the stack pointer 
 The question arises, what could this be related to? I did not change the memory configuration in any way, i.e. sram0_ns is used with a size of 128 KB 
 Kind regards, 
 Yuri

Yury Morgunov · Accepted Answer

In the end, I experimentally found out that the stack pointer is not set to the end of flash memory, but to the end of the main thread, because of this I got confused. 
 In addition, the CONFIG_MAIN_STACK_SIZE parameter does not set the main thread's stack size directly, it only increases the memory size by CONFIG_MAIN_STACK_SIZE. This also caused problems in my understanding. 
 As a result, it turns out that the size of the stack memory available for the main thread is 0x8000 + CONFIG_MAIN_STACK_SIZE Where 0x8000 came from, I still do not understand. 
 Therefore, if there is not enough memory, you need to increase CONFIG_MAIN_STACK_SIZE or CONFIG_HEAP_MEM_POOL_SIZE if there is not enough heap. 
 Correct me if I am wrong somewhere

Used 25% of memory, but the program restarts due to insufficient memory

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