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
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b302d4-2bce9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b302d4-2bce9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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