Tr:Re: CIFS VFS: Unexpected SMB signature ...NULL inode in lookup

sergio.conrad-QFKgK+

2013-11-20 11:22:08 UTC

I can reproduce the error with this procedure :
=C2=A0

a script:

for num in $(seq 1 200)
do=C2=A0
dd if=3D/dev/zero of=3Dcifsmount/file${num} bs=3D1024 count=3D1000
done

=C2=A0

Execute the script, and send control-C several time when running

50 % chance i got unexpected SMB signature

=C2=A0any idea ?

=C2=A0

Message du 20/11/13 08:48
Objet : Re: CIFS VFS: Unexpected SMB signature ...NULL inode in looku=

Hello
I have open a bug quite a while ago https://bugzilla.samba.org/show_b=

ug.cgi?id=3D9477 and=20
don't have any news.

I am using sec=3Dkrb5i, but have the same problem with ntlmv2...
The problem is the same with a centos 6 computer.
Perhaps the problem is in the Windows Server ...
Do I have to change AllowLegacySrvCall as described in=20

http://support.microsoft.com/kb/957441 ?

Perhaps I have to put a more recent driver in my server: It is a Dell=

T610 server

with a NetExtreme II gigabitE (version 5.2.14 17/12/2009) ?
Please help , as the problems continue ...
Thanks
Serge Conrad
Hello ...
in the messages, you could see an SMB unexpected signature (21 Jan 16=

:13:16)

In the dump file , the trame no 470 is at the same time (16:13:16)
The environnement is the same as described in https://bugzilla.samba.=

org/show_bug.cgi?
id=3D9477

Regards,
Serge

Message du 25/01/13 16:15
De : "Steve French"
A : "sergio. conrad"
Objet : Re: CIFS VFS: Unexpected SMB signature ...NULL inode in loo=

kup

You could send the trace to me directly

Hello
I do have a network trace for
https://bugzilla.samba.org/show_bug.cgi?id=3D9477
But there is the public adress ip of the server in the trace. I d=

on't know

how to hide
this. Could I send the trace to you, or must I find a way to hide=

the

trace ?
Thanks
Serge

Message du 05/12/12 16:18
De : "Steve French"
A : "sergio.conrad"
Objet : Re: CIFS VFS: Unexpected SMB signature ...NULL inode in=

lookup

Could you open a bugzilla bug at bugzilla.samba.org and if poss=

ible

attach a network trace around the time that this is triggered (=

if it

is trivial to reproduce)
https://wiki.samba.org/index.php/Capture_Packets

Hello,
The log are from 2.6.43.8-1.fc15.x86_64.
I see also the error CIFS VFS: Unexpected SMB signature with =

the same

environnement
on a 3.6.6-1.fc16.x86_64

Thanks,
Serge

Message du 04/12/12 20:06
De : "Steve French"
A : "sergio.conrad"
Objet : Re: CIFS VFS: Unexpected SMB signature ...NULL inode=

in lookup

What kernel version?
I would not expect the "noserverino" mount option to be a fa=

ctor.

Jeff did fix one warning relating to unexpected signatures i=

n this

patch, see below (which I don't think is your issue (if the =

signature

is coming on a transact2 request).
commit 9c4843ea576107a3c1fb94f2f758f198e9fe9e54
Author: Jeff Layton
Date: Mon Jun 6 15:40:23 2011 -0400
cifs: silence printk when establishing first session on sock=

When signing is enabled, the first session that's establishe=

d on a

CIFS VFS: Unexpected SMB signature
This is because the key exchange hasn't happened yet, so the=

signature

field is bogus. Don't try to check the signature on the sock=

et until

the

first session has been established. Also, eliminate the spec=

ific check

for SMB_COM_NEGOTIATE since this check covers that case too.

Hi,
I have a problem with users losing their connections from =

linux

clients with cifs
share. (Windows 2008) :CIFS VFS: Unexpected SMB signature

I am using two methods for mounting: pam_mount and autofs,=

both

with same results.

I am using mount options nounix,noserverino
I am lauching cifs module on boot (rc.local) with
modprobe cifs
echo 0 > /proc/fs/cifs/OplockEnabled
echo 1 > /proc/fs/cifs/MultiuserMount
echo 7 > /proc/fs/cifs/cifsFYI
in /var/log/messages
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=

=3D

Unexpected lookup error
-512
Unexpected SMB signature

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

cifs.spnego;0;0;3f000000
;ver=3D0x2;host=3Dfigue;ip4=3D130.xxx.xxx.xxx;sec=3Dkrb5;uid=3D0x=

1000005;creduid=3D0x1000005;us

er=3D21206xxx;pid=3D0x65f
Dec 3 16:29:35 u1205-08l cifs.upcall: ver=3D2
Dec 3 16:29:35 u1205-08l cifs.upcall: host=3Dfigue
Dec 3 16:29:35 u1205-08l cifs.upcall: ip=3D130.120.8.11
Dec 3 16:29:35 u1205-08l cifs.upcall: sec=3D1
Dec 3 16:29:35 u1205-08l cifs.upcall: uid=3D16777221
Dec 3 16:29:35 u1205-08l cifs.upcall: creduid=3D16777221
Dec 3 16:29:35 u1205-08l cifs.upcall: user=3D21206xxx
Dec 3 16:29:35 u1205-08l cifs.upcall: pid=3D1631
Dec 3 16:29:35 u1205-08l cifs.upcall: find_krb5_cc: consid=

ering

/tmp/krb5cc_167

77221

FILE:/tmp/krb5cc_16777221 i

s valid ccache
in dmesg
=3D=3D=3D=3D=3D=3D=3D=3D=3D
fs/cifs/inode.c: Getting info on \21206xxx\TP9
[ 3735.419612] fs/cifs/transport.c: For smb_command 50
[ 3735.419615] fs/cifs/transport.c: Sending smb: total_len=

104

[ 3735.420257] fs/cifs/connect.c: RFC1002 header 0x23
[ 3735.420261] fs/cifs/connect.c: invalid transact2 word c=

ount

[ 3735.422403] fs/cifs/transport.c: cifs_sync_mid_result: =

cmd=3D50

mid=3D37012 state=3D4

[ 3735.422406] CIFS VFS: Unexpected SMB signature
[ 3735.422408] Status code returned 0xc0000022

NT_STATUS_ACCESS_DENIED

[ 3735.422411] fs/cifs/netmisc.c: Mapping smb error code 0=

xc0000022

to POSIX err
-13

[ 3735.422413] fs/cifs/cifssmb.c: Send error in QPathInfo =

=3D -13

[ 3735.422415] fs/cifs/dir.c: CIFS VFS: leaving cifs_looku=

p (xid =3D

76854) rc =3D -13

[ 3735.422424] fs/cifs/dir.c: CIFS VFS: in cifs_lookup as =

16777221

[ 3735.422427] fs/cifs/dir.c: parent inode =3D 0xf14481f0 =

TP9 and dentry =3D
0xf074e300

[ 3735.422429] fs/cifs/dir.c: NULL inode in lookup
[ 3735.422430] fs/cifs/dir.c: Full path: \21206xxx\TP9 ino=

de =3D 0x

(null)

I don't understand what happens...
NULL inode in lookup ... What about noserverino option ?
Perhaps an unresponsive server... The network infrastructu=

re is

old. Last year I
got this working very well, but the server was in a better place =

(switch

and network
infrastructure speaking)

Regards,
Thanks in advance
Serge Conrad
Une messagerie gratuite, garantie =C3=A0 vie et des servic=

es en plus, =C3=A7a

vous tente ?

Je cr=C3=A9e ma bo=C3=AEte mail www.laposte.net
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Thanks,
Steve
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Thanks,
Steve
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=C2=A0

Jeff Layton

2013-11-20 11:33:01 UTC

Permalink

On Wed, 20 Nov 2013 12:22:08 +0100

Post by sergio.conrad-QFKgK+
=20
=A0
=20
=20
for num in $(seq 1 200)
do=A0
dd if=3D/dev/zero of=3Dcifsmount/file${num} bs=3D1024 count=3D1000
done
=20
=A0
=20
Execute the script, and send control-C several time when running
=20
50 % chance i got unexpected SMB signature
=20
=A0any idea ?
=20
=20

You need a more recent kernel, or a backport of commit
ad313cb86dfba27f8f2306da304974ef17c91c56.

Post by sergio.conrad-QFKgK+
=A0

Message du 20/11/13 08:48
Objet : Re: CIFS VFS: Unexpected SMB signature ...NULL inode in loo=

kup