It is an Aliyun ecs server, and the following information is seen through vnc login, entering rescue mode.
Generating “/run/initramfs/rdsosreport.txt”
“Entering emergency mode. Exit the shell to continue”
“Type ‘journalctl’ to view system log.”
You might want to save “/run/initramfs/rdsosreport.txt” to a USB stick or /boot after mounting them and attach it to a bug report.

journalctl warning: /dev/vda1 contains a file system with errors,check forced
fsck failed with error code 4.
Failed to start FIle System Check on /dev/disk/by-uuid/xxx
Dependency failed for /sysroot.
And many other errors, it is impossible to see to which part of the operating system boots into the rescue mode!

1. execute fsck -y /dev/vda1 under :/#, there is fsck command, prompt /dev/vda1 is mounted

2, the directory umount off, reboot again can enter the system normally