Bug 6159 - mount.cifs fails with mount error(22): Invalid argument if server has multiple ip addresses
Summary: mount.cifs fails with mount error(22): Invalid argument if server has multipl...
Status: RESOLVED DUPLICATE of bug 4548
Alias: None
Product: CifsVFS
Classification: Unclassified
Component: user space tools (show other bugs)
Version: 2.6
Hardware: Other Linux
: P3 normal
Target Milestone: ---
Assignee: Steve French
QA Contact:
URL: http://bugs.debian.org/518113
Depends on:
Reported: 2009-03-04 16:02 UTC by Debian samba package maintainers (PUBLIC MAILING LIST)
Modified: 2009-04-04 05:18 UTC (History)
2 users (show)

See Also:


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Description Debian samba package maintainers (PUBLIC MAILING LIST) 2009-03-04 16:02:56 UTC
From our Debian user:


It took me quite some time to figure out what the cause was:

/sbin/mount.cifs //server/share mointpoint --verbose -o user=username,noperm
parsing options: user=username,noperm

mount.cifs kernel mount options unc=//server\share,pass=******,ver=1,user=username,noperm,uid=1024,gid=100
mount error(22): Invalid argument

Now 'server' has an ipv4 and an ipv6 address.

If I pass options -o user=user,ip=servername,noperm the same error 22 is risen.

If I pass options -o user=user,ip=ipv4-address-of-server,noperm the mount is successfull.

I didn't test if this is just ipv6 related, or just happens if a server has multiple Address records.

This does not happen with mount.cifs from etch (samba 3.0.24) or lenny (samba 3.2.5), then only the ipv4 address is being tried and it works
without specifying an ip= option.
Comment 1 shirishpargaonkar@gmail.com 2009-03-11 13:12:46 UTC
I tried this and mount failed.

# mount -t cifs //cifstest8/smb8 /mnt/smb_a --verbose -o ip=fe80::214:5eff:fefb:3f7c,noperm,user=root,pass=password

parsing options: rw,ip=fe80::214:5eff:fefb:3f7c,noperm,user=root,pass=password
ip address fe80::214:5eff:fefb:3f7c override specified
ip address specified explicitly

mount.cifs kernel mount options unc=//cifstest8\smb8,ver=1,rw,ip=fe80::214:5eff:fefb:3f7c,noperm,user=root,pass=root
mount error 22 = Invalid argument
Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)
cifstest6:~ # dmesg
 CIFS VFS: Error connecting to socket. Aborting operation
 CIFS VFS: cifs_mount failed w/return code = -22

eventhough I can ping the ipv6 interface on the server

ping6 -I eth0 fe80::214:5eff:fefb:3f7c
PING fe80::214:5eff:fefb:3f7c(fe80::214:5eff:fefb:3f7c) from fe80::214:5eff:fefb:3f54 eth0: 56 data bytes
64 bytes from fe80::214:5eff:fefb:3f7c: icmp_seq=1 ttl=64 time=3.92 ms
64 bytes from fe80::214:5eff:fefb:3f7c: icmp_seq=2 ttl=64 time=0.146 ms

Do you see any error messages like this?  

You can clear syslog buffer
 dmesg -c
turn on cifs debugging by doing
 echo 7 > /proc/fs/cifs/cifsFYI
issue the mount command and 
obtain syslog buffer by doing command

and send that output
Comment 2 shirishpargaonkar@gmail.com 2009-03-12 10:02:16 UTC
After turning on debugging,

echo 1 > /proc/fs/cifs/cifsFYI
echo 1 > /proc/fs/cifs/traceSMB

I see following messages in syslog buffer.

The client is at 2.6.29-rc7-1-default and server is at

cifstest6:~ # dmesg
 fs/cifs/cifsfs.c: Devname: //cifstest8/smb8 flags: 64
 fs/cifs/connect.c: CIFS VFS: in cifs_mount as Xid: 2 with uid: 0
 fs/cifs/connect.c: Username: root
 fs/cifs/connect.c: UNC: \\cifstest8\smb8 ip: fe80::214:5eff:fefb:3f7c
 fs/cifs/connect.c: attempting ipv6 connect
 fs/cifs/connect.c: ipv6 Socket created
 fs/cifs/connect.c: Error -22 connecting to server via ipv6
 CIFS VFS: Error connecting to socket. Aborting operation
 fs/cifs/connect.c: CIFS VFS: leaving cifs_mount (xid = 2) rc = -22
 CIFS VFS: cifs_mount failed w/return code = -22

Took a wireshark trace during this but do not see any traffic over 
ipv6 source and destination (interface) addresses.
Comment 3 shirishpargaonkar@gmail.com 2009-03-12 13:00:24 UTC
When ip=<ipv6_address_of_the_samba_server> option is specified, nothing is
logged on the samba server, so nothing goes out on the wire from the cifs
vfs client (wireshark trace also confirms that) to the samba server.

Need to figure out what and why this error

fs/cifs/connect.c: Error -22 connecting to server via ipv6

Comment 4 shirishpargaonkar@gmail.com 2009-03-12 13:27:51 UTC
Something incorrect in connect system call in function ipv6_connect()
to generate EINVAL (22) error.
Comment 5 shirishpargaonkar@gmail.com 2009-03-12 14:05:33 UTC
I think this failure (in my case) has to do something with the scope of
the address (Scope:Link)

inet6 addr: fe80::214:5eff:fefb:3f7c/64 Scope:Link

I suspect the ipv6 address you are using has similar scope, Scope:Link
when the error EINVAL is genereated, connect just does not succeed.

Comment 6 shirishpargaonkar@gmail.com 2009-03-12 14:21:03 UTC
If your network interface can be configured with a Scope:Global or a Scope:Site
address, I think mount would succeed (i.e. would not generate EINVAL -22).
Comment 7 Steve Langasek 2009-03-14 02:02:52 UTC
Julien Cristau notes that, since the target IP in the example is a link-local address, it's necessary to specify an interface name the same as you do when calling ping.  The syntax for this is:


However, even when specifying the interface name a mount.cifs still fails for me.
Comment 8 Jeff Layton 2009-03-15 06:46:15 UTC
Yes, I'm not sure that we really can support link-local addresses (and tbh: I'm not exactly sure yet how we should support them). Our address parser doesn't understand interface names in the scope...

I could be wrong, but aren't link-local addresses really only supposed to be used for things like neighbor discovery?

Some confirmation of the problem from the original reporter might be nice. An strace of the mount command that shows a link-local ip addr in the mount options, for instance...

> If I pass options -o user=user,ip=servername,noperm the same error 22 is risen.

That's expected since you're passing something that isn't an IP address into the kernel as if it were. When "ip=" is explicitly specified then the mount helper doesn't bother with name resolution and passes it on directly.
Comment 9 shirishpargaonkar@gmail.com 2009-03-20 01:00:45 UTC
I see bug 4548.  This probably needs to be returned as a duplicate of 4548.
Looking into 4548
Comment 10 Debian samba package maintainers (PUBLIC MAILING LIST) 2009-04-04 05:18:55 UTC
Shirish is right: this is a duplicate of #4548

*** This bug has been marked as a duplicate of bug 4548 ***