about hung in heap_memory_free function

Hi all ,

I was use alloc and free function to implement dynamic memory management  .
But when I stress the code , the program is hung in sysbios api :HeapMem_free .
I have 2 questions .
1.Can I use alloc/ free to do dynamic memory management or need to use HeapMem_alloc/HeapMem_free
2.Can you provide some hint why the program is in follow while loop ?

sysbios version : bios_6_35_01_29

Here is the hang area 

    /* Go down freelist and find right place for buf */
    while (nextHeader != NULL && nextHeader < newHeader) {
        /* Make sure the addr is not in this free block */
        Assert_isTrue(((UArg)newHeader >= (UArg)nextHeader + nextHeader->size),
                       HeapMem_A_invalidFree);
        curHeader = nextHeader;
        nextHeader = nextHeader->next;
    }