Re: Fwd: cifsd killed on wrong pwd

On Thu, 4 Jun 2009 13:26:47 +0200
Thomas Anglmaier <[email protected]> wrote:

> hi list,
>  
> we face a problem on several linux systems where multiple users mount cifs shares from a unique server.
> the cifs-documentation says that a single thread (cifsd) is started for each unique server and it seems that cifsd is getting killed if a users tries to mount and gives wrong password. even if there are existing mounts from that server.
>  
> here is what happens:
>  
>  
> root@tofo2 ~]# df -ha
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda1             7.6G  4.8G  2.5G  67% /
> proc                     0     0     0   -  /proc
> sysfs                    0     0     0   -  /sys
> devpts                   0     0     0   -  /dev/pts
> tmpfs                 125M     0  125M   0% /dev/shm
> none                     0     0     0   -  /proc/sys/fs/binfmt_misc
> sunrpc                   0     0     0   -  /var/lib/nfs/rpc_pipefs
> 
> [root@tofo2 ~]# echo 1 > /proc/fs/cifs/MultiuserMount 
> [root@tofo2 ~]# dmesg
> [root@tofo2 ~]#  mount -t cifs -o user=tom //tofo1/home1 /mnt/1
> Password: 
> 
> [root@tofo2 ~]# df -ha
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda1             7.6G  4.8G  2.5G  67% /
> proc                     0     0     0   -  /proc
> sysfs                    0     0     0   -  /sys
> devpts                   0     0     0   -  /dev/pts
> tmpfs                 125M     0  125M   0% /dev/shm
> none                     0     0     0   -  /proc/sys/fs/binfmt_misc
> sunrpc                   0     0     0   -  /var/lib/nfs/rpc_pipefs
> //tofo1/home1         7.6G  2.5G  4.7G  35% /mnt/1
> 
> [root@tofo2 ~]#  mount -t cifs -o user=max //tofo1/home2 /mnt/2
> Password: 		#giving wrong password
> mount error 13 = Permission denied
> Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)
> 
> [root@tofo2 ~]# df -ha
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda1             7.6G  4.8G  2.5G  67% /
> proc                     0     0     0   -  /proc
> sysfs                    0     0     0   -  /sys
> devpts                   0     0     0   -  /dev/pts
> tmpfs                 125M     0  125M   0% /dev/shm
> none                     0     0     0   -  /proc/sys/fs/binfmt_misc
> sunrpc                   0     0     0   -  /var/lib/nfs/rpc_pipefs
> //tofo1/home1         0.0K  0.0K  0.0K   -  /mnt/1
> [root@tofo2 ~]# stat /mnt/1 
> stat: cannot stat `/mnt/1': Input/output error
> 
> 
> #dmesg output of the 2nd mount request (with wrong passwd)
>  fs/cifs/cifsfs.c: CIFS VFS: in cifs_statfs as Xid: 75 with uid: 0
>  fs/cifs/cifssmb.c: In QFSPosixInfo
>  fs/cifs/transport.c: For smb_command 50
>  fs/cifs/transport.c: Sending smb of length 68
>  fs/cifs/connect.c: rfc1002 length 0x74
>  fs/cifs/cifsfs.c: CIFS VFS: leaving cifs_statfs (xid = 75) rc = 0
>  fs/cifs/cifsfs.c: Devname: //tofo1/home2 flags: 64 
>  fs/cifs/connect.c: CIFS VFS: in cifs_mount as Xid: 76 with uid: 0
>  fs/cifs/connect.c: Username: max
>  fs/cifs/connect.c: UNC: \\tofo1\home2 ip: 192.168.0.20
>  fs/cifs/connect.c: Existing tcp session with server found
>  fs/cifs/connect.c: Existing smb sess not found
>  fs/cifs/connect.c: Security Mode: 0x3 Capabilities: 0x80f3fd TimeAdjust: -7200
>  fs/cifs/sess.c: sess setup type 2
>  fs/cifs/transport.c: For smb_command 115
>  fs/cifs/transport.c: Sending smb:  total_len 244
>  fs/cifs/connect.c: rfc1002 length 0x27
>  Status code returned 0xc000006d NT_STATUS_LOGON_FAILURE
>  fs/cifs/netmisc.c: Mapping smb error code 5 to POSIX err -13
>  fs/cifs/misc.c: Null buffer passed to cifs_small_buf_release
>  fs/cifs/sess.c: ssetup rc from sendrecv2 is -13
>  fs/cifs/sess.c: ssetup freeing small buf ca306900
>  CIFS VFS: Send error in SessSetup = -13
>  fs/cifs/connect.c: No session or bad tcon
>  fs/cifs/connect.c: cifsd thread killed
>  fs/cifs/connect.c: CIFS VFS: leaving cifs_mount (xid = 76) rc = -13
>  CIFS VFS: cifs_mount failed w/return code = -13
>  fs/cifs/cifsfs.c: CIFS VFS: in cifs_statfs as Xid: 77 with uid: 0
>  fs/cifs/cifssmb.c: In QFSPosixInfo
>  fs/cifs/cifssmb.c: In QFSInfo
>  fs/cifs/cifssmb.c: OldQFSInfo
>  fs/cifs/cifsfs.c: CIFS VFS: leaving cifs_statfs (xid = 77) rc = -5
>  fs/cifs/inode.c: CIFS VFS: in cifs_revalidate as Xid: 78 with uid: 0
>  fs/cifs/inode.c: Revalidate:  inode 0xc956fe20 count 1 dentry: 0xc8f41c40 d_time 0 jiffies 4452665
>  fs/cifs/inode.c: Getting info on 
>  fs/cifs/cifssmb.c: In QPathInfo (Unix) the path 
>  fs/cifs/inode.c: error on getting revalidate info -5
>  fs/cifs/inode.c: cifs_revalidate - inode unchanged
>  fs/cifs/inode.c: CIFS VFS: leaving cifs_revalidate (xid = 78) rc = -5
>  fs/cifs/inode.c: CIFS VFS: in cifs_revalidate as Xid: 79 with uid: 0
>  fs/cifs/inode.c: Revalidate:  inode 0xc956fe20 count 1 dentry: 0xc8f41c40 d_time 0 jiffies 4452990
>  fs/cifs/inode.c: Getting info on 
>  fs/cifs/cifssmb.c: In QPathInfo (Unix) the path 
>  fs/cifs/inode.c: error on getting revalidate info -5
>  fs/cifs/inode.c: cifs_revalidate - inode unchanged
>  fs/cifs/inode.c: CIFS VFS: leaving cifs_revalidate (xid = 79) rc = -5
> 
> 
> now the "cifsd" kernel thread is gone:
> [root@tofo2 ~]# ps aux | grep cifsd | grep -v grep
> root      2643  0.0  0.0      0     0 ?        S<   11:35   0:00 [cifsdnotifyd]
> 
> 
> the line that makes me worry in the dmesg output is:
> fs/cifs/connect.c: cifsd thread killed
> 
> further on in this output:
>  fs/cifs/connect.c: Existing tcp session with server found
>  fs/cifs/connect.c: Existing smb sess not found
> 
> for my very naive understanding should'nt it say smthg like "Existing smb sess found" instead of "Existing smb sess *not* found" over here?
> 
> 
> is this usual behaviour? am i missing some mount options or did i discover a bug?
> i searched all mailinglists but did not find a related problem description.
> 
> can anyone point me in the right direction or have had the same problem?
> 

What kernel is this client running?

Thanks,
-- 
Jeff Layton <[email protected]>