When the server of the centos7 system encounters a running block, how to find the blocking process? As shown in the figure

Centos7 nginx server operation-and-maintenance linux
Jun.14,2022 
top -o %CPU

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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-64f5-1e7602a-5a3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e7602a-5a3.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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