What to do if regular 502 errors occur in php7 + linux?

A set of main station environment was built on the development and testing machine. At the beginning, it was normal and 502 was normal every time.

NGINX error log:

php-fpm.log log:

Change the php process to 1, strace -p pid -o text.txt, view the process:

dmesg View error message:

gdb View core dump:

No clear error From the source, I can only conclude that it is a memcache connection problem. I searched for the error and found that it was a problem with the memcached extension. I updated the corresponding memcached extension of php7 and returned to normal after restarting.

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