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The effect of the TCB_FLAG_CUSTOM_STACK flag is the that the OS will not attempt to free the custom stack memory if the kernel thread exits, crashes, or is killed.  Does this matter in your implementation?  Could this result in some kind of memory leak?  If any kind of clean-up is required by your application to free the custom stack memory, you will probably want to use an on_exit() or atexit() function to get a callback when the kernel thread is terminated.

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