FreeBSD Modify root password error Passwd:pam_chauthtok (): Error in service module

Modifying the account password in FreeBSD can sometimes cause errors, and the following solutions are simply sorted out for Passwd:pam_chauthtok (): Error in service module:
Error Tip:

The code is as follows
kiccleaf# passwd Kiccleaf Changing local password for kiccleaf New Password: Retype New Password: /: Write failed, filesystem is full Passwd:pam_chauthtok (): Error in service module

To modify the method:
1. Give all permissions to the/etc/passwd file
2. Modify the good password
3. Restore the appropriate permissions of the file

code is as follows
kiccleaf# LL/ETC/PASSWD -rw-r--r--  1 root  wheel  1509 Apr 14:35/etc/passwd kiccleaf# chmod 777/et C/PASSWD kiccleaf# passwd kiccleaf Changing local password for kiccleaf New password: Retype new password: kiccleaf# chmod 644/etc/passwd