Gregory Nutt 124e6ee53d sched/sched/sched_releasetcb.c: Handle custom stack allocations.
sched_releasetcb() will normally free the stack allocated for a task.  However, a task with a custom, user-managed stack may be created using nxtask_init() followed by nxtask_activer.  If such a custom stack is used then it must not be free in this many or a crash will most likely result.

This chagne addes a flag call TCB_FLAG_CUSTOM_STACK that may be passed in the the pre-allocted TCB to nxtask_init().  This flag is not used internally anywhere in the OS except that if set, it will prevent sched_releasetcb() from freeing that custom stack.
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