当以root身份登录，执行vim /proc/sys/kernel/core_uses_pid修改core_uses_pid值的时候，产生如下错误。
WARNING: The file has been changed since reading it!!!
Do you really want to write to it (y/n)?y
"core_uses_pid" E667: Fsync failed
Hit ENTER or type command to continue”
解决方法：
(1)vim /etc/sysctl.conf在最后一行添加kernel.core_uses_pid = 1
（2）执行sysctl -p