Why RTOS Task Stacks Often Cause Field Issues
When an RTOS device resets in the field, hits a random HardFault, jumps into invalid code, or corrupts queue data, engineers often suspect pointers, concurrency, peripherals, or power.
Those are valid suspects, but one common cause is simpler: a task stack is too small.
RTOS tasks usually do not have a large process address space or strong isolation like Linux processes. Each task owns a stack region whose size is often fixed at task creation. Make it too large and RAM is wasted. Make it too small and the failure may not happen immediately; the stack may silently overwrite nearby memory.
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