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When realloc-ing to a smaller buffer size which ends up allocated in a different heap, the heap structure is corrupted. This can only happen: * If heap checking is Comprehensive (meaning buffers are never shrunk in place) and the heap the buffer was originally allocated in is full. * Calling heap_caps_realloc() to deliberately move a buffer to a different capabilities type, and shrink it at the same time. Probable fix for https://github.com/espressif/esp-idf/issues/1582 Probably the same issue: https://www.esp32.com/viewtopic.php?f=2&t=4583 https://www.esp32.com/viewtopic.php?f=13&t=3717