libxml2-Question about xmlCreateFileParserCtxt

I'm confused about the return value. I think the ret is a newly allocated memory, and I need to free it by using xmlFreeParserCtxt. But when I remove xmlFreeParserCtxt, I found there is no error and I'm sure the ret value is not NULL!(I use fsanitize=address to detect) If the ret value of xmlCreateFileParserCtxt is not NULL, is it possible that it isn't newly allocated? My code: #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int main() { const char* xmlFilePath = "example.xml"; // Create a parser context for parsing an XML file xmlParserCtxtPtr ctxt = xmlCreateFileParserCtxt(xmlFilePath); if (ctxt == NULL) { printf("Failed to create parser context for file: %s\n", xmlFilePath); return 1; } // Cleanup // xmlFreeParserCtxt(ctxt); return 0; } First, I add the xmlFreeParserCtxt(ctxt);, I'm sure there is no error msg. And then, I delete this line. I compile this code by: gcc ./test.c -g -lxml2 -fsanitize=address.I think I should got error output, but nothing happened. No memleaks!