2018-09-19 11:58:25 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.zhihu.com/question/265749263>; (referer: https://www.zhihu.com/question/265749263/answer/298529974)
2018-09-19 11:58:25 [scrapy.extensions.logstats] INFO: Crawled 20 pages (at 5 pages/min), scraped 10 items (at 5 items/min)
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/24252236>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/24252236>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/264756735>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/264756735>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/264756735>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/264756735>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/23846254>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/23846254>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/23846254>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/60410308>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/264756735>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/23846254>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/23846254>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/23846254>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/265749263>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/265749263>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/265749263>;
None
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/265749263>;
None
2018-09-19 11:58:25 [scrapy.core.engine] INFO: Closing spider (finished)
2018-09-19 11:58:25 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 7823,
 'downloader/request_count': 20,
 'downloader/request_method_count/GET': 20,
 'downloader/response_bytes': 7113,
 'downloader/response_count': 20,
 'downloader/response_status_count/400': 20,
 'dupefilter/filtered': 9,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2018, 9, 19, 3, 58, 25, 849646),
 'item_scraped_count': 28,
 'log_count/DEBUG': 202,
 'log_count/INFO': 10,
 'request_depth_max': 3,
 'response_received_count': 20,
 'scheduler/dequeued': 20,
 'scheduler/dequeued/memory': 20,
 'scheduler/enqueued': 20,
 'scheduler/enqueued/memory': 20,
 'start_time': datetime.datetime(2018, 9, 19, 3, 55, 14, 766276)}
2018-09-19 11:58:25 [scrapy.core.engine] INFO: Spider closed (finished)### 问题描述

爬虫在运行一段时间后自动关闭，爬取了一部分的数据，但是start_urls（start_url
s中有多条链接，）中的链接并未爬取完的情况下爬虫就自动关闭了

请问  
2018-09-19 11:58:25 [scrapy.core.scraper] DEBUG: Scraped from <200 https://www.zhihu.com/question/265749263>;  None
这个反馈是在表达什么，为何会自动关闭