本次在实际测试情况下，发现程序无缘无故的异常，导致看门狗超时复位，经过排查是malloc函数分配失败的时候，依然对指针进行了操作，导致异常。以前没重视这个问题是因为，总觉的malloc基本都会成功的，假如循环调用一个函数logOutput，里面有malloc和free，那么下次调用logOutput分配相同的空间应该也是成功的（实际上非我所愿）。问题函数如下，必须对pBuffer没有分配成功做处理，否则很容易出问题。
static inline void logOutput(uint32_t level, const char *tag, const char* format, ...)
{va_list va;int len, len2,space;char* pBuffer;
pBuffer = (char*)malloc(512);/*space "\n\0"*/if(pBuffer == NULL)return;space = gLogBufferLength - 2;len = utils_snprintf(pBuffer, LOG_PREFIX_SIZE_MAX, "#%s,%d:", tag,level);utils_snprintf( pBuffer, LOG_PREFIX_SIZE_MAX, "#%s,%d:", tag,level);space -= len;va_start(va, format);len2 = utils_vsnprintf( pBuffer+len, space ,format, va);va_end(va);len += (len2>0?len2:space);if(len < gLogBufferLength - 2){pBuffer[len] = '\n';pBuffer[len+1] = '\0';}else{pBuffer[gLogBufferLength - 5] = '.';pBuffer[gLogBufferLength - 4] = '.';pBuffer[gLogBufferLength - 3] = '?';pBuffer[gLogBufferLength - 2] = '\n';pBuffer[gLogBufferLength - 1] = '\0';}logwrite((uint8_t*)pBuffer,utils_strlen(pBuffer));free(pBuffer);
};
