Phpmyadmin disconnects from the server

problem description

after installing LNMP, if you want to build a database, you enter phpmyadmin, but after logging in, the following error message is displayed

the environmental background of the problems and what methods you have tried

I searched the Internet for a long time and didn"t find any relevant questions and answers.

related codes

/ / Please paste the code text below (do not replace the code with pictures)
code is the default configuration. I have not changed any settings for phpmyadmin and php. Session has 1440

what result do you expect? What is the error message actually seen?

Linux mysql php

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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-64f5-1be5684-30cbe.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be5684-30cbe.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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