为什么用ulog_file输出日志文件生成的第一份ulog.log.x文件内容有问题

int main(void)
{
// LOG_D("Hello RT-Thread!");
set_date(2018, 12, 11);
set_time(11, 15, 50);
fal_init();
struct rt_device flash_dev = fal_mtd_nor_device_create(FS_PARTITION_NAME);
if (flash_dev == NULL)
{
LOG_E("Can't create a mtd device on '%s' partition.\n", FS_PARTITION_NAME);
}
else
{
LOG_I("Create a mtd device on the %s partition of flash successful.\n", FS_PARTITION_NAME);
}
if(rt_device_find(FS_PARTITION_NAME) != RT_NULL)
{
/ 挂载 littlefs /
if (dfs_mount(FS_PARTITION_NAME, "/", "lfs", 0, 0) == 0)
{
ulog_file_backend_init();
LOG_I("Filesystem initialized!");
LOG_D("Hello RT-Thread!");
LOG_I("Filesystem initialized!");
LOG_D("Hello RT-Thread!");
}
else
{
/ 格式化文件系统 /
dfs_mkfs("lfs", FS_PARTITION_NAME);
/ 挂载 littlefs */
if (dfs_mount(FS_PARTITION_NAME, "/", "lfs", 0, 0) == 0)
{
ulog_file_backend_init();
LOG_I("Filesystem initialized!");
}
else
{
LOG_E("Failed to initialize filesystem!");
}
}
}
else
{
LOG_E("find filesystem portion failed\r\n");
}
rt_uint8_t i=0;
while(i++<25)
{
LOG_D("Hello RT-Thread!");
LOG_I("Filesystem initialized!");
}
return RT_EOK;
}
只有上电后输出的第一份文件是这样，之后的文件内容都是正常的

控制台打印的信息都是对的