[linux-cifs-client] mount.cifs and dfs referrals

[Shirish Pargaonkar]

On Thu, Jan 29, 2009 at 5:35 AM, Werner Maes
<Werner.Maes at icts.kuleuven.be> wrote:
> hello
>
> I wanted to know whether mount.cifs is able to follow dfs referrals.
> On my system I get a kernel failure if I try this
>
> mount.cifs //AD-DOMAIN/DFS /mnt -o username="AD\user"
>
> /mnt seems to be mounted
> //xx.yy.KULEUVEN.BE/xx/ on /mnt type cifs (rw,mand)
>
> but if I do ll /mnt, I get a segmentation fault and this appears in dmesg (see below):
>
> so my question is: is mount.cifs able to follow dfs links like smbclient can?
>
> kind regards
>
> werner
>
> kernel BUG at fs/cifs/cifs_dfs_ref.c:274!
> invalid opcode: 0000 [#1] SMP
> Modules linked in: nls_utf8 cifs fuse sunrpc ipv6 dm_multipath uinput ppdev floppy pcspkr i2c_piix4 pcnet32 mii parport_pc i2c_core parport BusLogic [last unloaded: microcode]
>
> Pid: 5110, comm: ls Not tainted (2.6.27.12-170.2.5.fc10.i686 #1)
> EIP: 0060:[<d09d6ef1>] EFLAGS: 00010246 CPU: 0
> EIP is at cifs_dfs_follow_mountpoint+0x3b/0x627 [cifs]
> EAX: c68ce7f8 EBX: c68ce7f8 ECX: d09ec7dc EDX: cfb85f38
> ESI: cfb85f38 EDI: ce5d3000 EBP: cfb85e88 ESP: cfb85e3c
>  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> Process ls (pid: 5110, ti=cfb85000 task=c1613340 task.ti=cfb85000)
> Stack: cfb85e58 cfb85f38 cf84af68 cf84af00 ce5d3000 cfb85e70 c04a4a55 c06a9411
>       cf0565d8 cfb85edc cfb85f38 cfb85edc ce5d3000 cfb85e78 00000000 00000000
>       00000000 cfb85f38 ce5d3000 cfb85eb4 c049941c cfb85edc cfb85edc c68ce7f8
> Call Trace:
>  [<c04a4a55>] ? mntput_no_expire+0x1a/0xf7
>  [<c06a9411>] ? _spin_lock+0x8/0xb
>  [<c049941c>] ? do_follow_link+0xdb/0x272
>  [<c0499110>] ? __link_path_walk+0x5b2/0x6b5
>  [<c04995ff>] ? path_walk+0x4c/0x9b
>  [<c04997fb>] ? do_path_lookup+0x12d/0x175
>  [<c049a8fa>] ? user_path_at+0x3c/0x62
>  [<c04a4a55>] ? mntput_no_expire+0x1a/0xf7
>  [<c0497986>] ? mntput+0x13/0x15
>  [<c04a9021>] ? sys_getxattr+0x1e/0x49
>  [<c051edbc>] ? trace_hardirqs_on_thunk+0xc/0x10
>  [<c0403c6e>] ? syscall_call+0x7/0xb
>  =======================
> Code: d0 01 89 55 b8 c7 45 f0 00 00 00 00 c7 45 ec 00 00 00 00 74 11 68 94 a6 9d d0 68 2f 64 9e d0 e8 82 08 cd ef 59 5e 3b 5b 18 75 04 <0f> 0b eb fe e8 20 7c ff ff f6 05 00 da 9e d0 01 89 45 bc 74 21
> EIP: [<d09d6ef1>] cifs_dfs_follow_mountpoint+0x3b/0x627 [cifs] SS:ESP 0068:cfb85e3c
>
>
>
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> linux-cifs-client at lists.samba.orgHow do I recreate this problem?


If I have this setup, I cannot use domain name to mount the share
How do I recreate the problem?

:~ # net ads testjoin
Join is OK

:~ # net ads info
LDAP server: 1.2.345.67
LDAP server name: CIFSTESTx.cifstestdom.xyz.com
Realm: CIFSTESTDOM.XYZ.COM
Bind Path: dc=CIFSTESTDOM,dc=XYZ,dc=COM
LDAP port: 389
Server time: Fri, 30 Jan 2009 12:11:27
KDC server: 1.2.345.67
Server time offset: 0

:~ # mount -t cifs //CIFSTESTDOM/dfsroot /mnt/smb_a -o
user=Administrator,pass=password
mount error: could not find target server. TCP name
CIFSTESTDOM/dfsroot not found
No ip address specified and hostname not found