vsftpd+mysql

Question

#%PAM-1.0
auth       required     pam_mysql.so  user=jsh passwd=auqjfypm host=localhost db=ftp table=user usercolumn=name passwdcolumn=passwd crypt=2
account    required     pam_mysql.so  user=jsh passwd=auqjfypm host=localhost db=ftp table=user usercolumn=name passwdcolumn=passwd crypt=2
password   required     pam_mysql.so  user=jsh passwd=auqjfypm host=localhost db=ftp table=user usercolumn=name passwdcolumn=passwd crypt=2
session    required     pam_mysql.so  user=jsh passwd=auqjfypm host=localhost db=ftp table=user usercolumn=name passwdcolumn=passwd crypt=2
auth       required     pam_listfile.so item=user sense=deny file=/etc/vsftpd.ftpusers onerr=succeed
auth       required     pam_stack.so service=system-auth
auth       required     pam_shells.so
account    required     pam_stack.so service=system-auth
session    required     pam_stack.so service=system-auth

RH9.0
vsftp1.1.3.conf
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YESxferlog_std_format=YES
guest_enable=yes
guest_username=jsh
pam_service_name=vsftpd
#userlist_enable=YES
#enable for standalone mode
listen=YES
tcp_wrappers=YES

MYSQL中权限为用户jsh读。以有两个用户.用这两个用户上FTP时出现
Dec  6 09:59:07 helix vsftpd: warning: can't get client address: Bad file descriptor
Dec  6 09:59:10 helix vsftpd(pam_unix)[5319]: check pass; user unknown
Dec  6 09:59:10 helix vsftpd(pam_unix)[5319]: authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=127.0.0.1