What if scrapy encounters Received SIG_SETMASK?

^ C2018-04-27 10:47:58 [scrapy.crawler] INFO: Received SIG_SETMASK, shutting down gracefully. Send again to force
^ C2018-04-27 10:47:58 [scrapy.crawler] INFO: Received SIG_SETMASK twice, forcing unclean shutdown

often get stuck and occasionally prompt the above mistakes. What is the general cause?

Mar.06,2021
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