[quote user="Darren Beckwith"]It looks to me like you are using more stack than you have allocated for the system.[/quote]
I am not familiar with this particular kernel, but typically each task has it's own stack space, and that is allocated out of heap. Heap is what is left over between the end of global/static data (at start of RAM) and the stack (at the end of RAM).
You need to look at your RAM memory allocation and make sure it is partitioned correctly, or more fundamentally that there is enough RAM to begin with.