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In a FreeRTOS project using heap_4, you observe heap corruption errors. Which of the following is a common cause?

medium📝 Debug Q7 of 15
FreeRTOS - Memory Management
In a FreeRTOS project using heap_4, you observe heap corruption errors. Which of the following is a common cause?
ANot including heap_4.c source file
BCalling pvPortFree() twice on the same pointer
CUsing heap_4 which does not support freeing memory
DAllocating memory with malloc() instead of pvPortMalloc()
Step-by-Step Solution
Solution:

  1. Step 1: Understand heap_4 features

    heap_4 supports freeing memory and coalesces free blocks to reduce fragmentation.

  2. Step 2: Identify cause of corruption

    Double freeing the same pointer corrupts the heap metadata causing errors.

  3. Final Answer:

    Calling pvPortFree() twice on the same pointer -> Option B

  4. Quick Check:

    Double free causes heap corruption [OK]
Quick Trick: Never free the same pointer twice [OK]
Common Mistakes:
  • Assuming heap_4 lacks free support
  • Blaming missing source include for corruption
  • Mixing malloc() with pvPortMalloc() without care

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