I have the following, very strange problem, which I'll try to describe now.

I've already sent this to the samba mailing list (about a week ago),
but haven't got a reply. As it might be kernel related and others
may be affected too, I decided to send it to this list, too.

A Samba server running Debian Etch with latest updates.

Different clients one running Etch with latest updates, too. The other one
runs
either Ubuntu (don't know which version because it's not my installation,
but quite recent) or
the older Debian 3 but with a recent vanilla kernel (either 2.6.20.1 or
2.6.22.10).

Ok. If I mount a share from the server via cifs on either ubuntu or debian
3.0 and do a simple
find /sharemount
everything seems to be okay, at first. after some lines (didn't count
them, but the amount seems
to vary from try to try and with some I mean maybe some 100) it starts to
stuck. Sometimes for 1 second
sometimes more and quite often I get "CIFS VFS: server not responding".
together with "CIFS VFS: No response for cmd 50 mid xxx" The xxx number
seems to vary.

The problem seems to be triggered by any operation which touches lots of
files quickly. E.g.
by copying source file directories onto or from it or simply by find.

Copying single larger files (I generated a 100MB file with dd) don't seems
to hurt.

Interestinly -- this is where the really strange part comes -- it seems to
work on the client which
has debian Etch installed.

I've tried the following combinations

System | Success?
--------------------------------------+---------
Ubuntu with vmlinuz-2.6.20-16-generic | NO
on Client 1 |
--------------------------------------+---------
Debian 3.0 2.6.20.1 Client 1 | NO
--------------------------------------+---------
Debian 3.0 2.6.22.10 Client 1 | NO
--------------------------------------+---------
Debian 4.0 with 2.6.18-5-486 2 | YES (Why?)
--------------------------------------+---------
Debian 3.0 (don't remember the kernel | NO
but something > 2.6.10) on Client 3 |

Well. You see, I've tried lots of combinations. I don't know what's
different with Etch on the client,
but either the problem is very widespread across various kernel versions
or the problem is server related.

The server side output in the logfile is the following:

[2007/10/12 21:03:41, 1] smbd/service.c:close_cnum(1150)
192.168.0.9 (192.168.0.9) closed connection to service test
[2007/10/12 21:03:41, 1] smbd/service.c:make_connection_snum(950)
192.168.0.9 (192.168.0.9) connect to service test initially as user
foobar (uid=10000, gid=10000) (pid 16721)

I tried to increase the loglevel to 5 but the logfile gets flooded with
other messages so I won't post
it here (Very long!). But I can put it onto my webspace and post an URL if
you think it helps.

Before I forget:
Samba Version 3.0.24 on the server, according to smbd -V.
As mount helper I use mount.cifs, compiled from samba-3.0.26a.

The fstab lines used to mount the shares look like that:
//192.168.0.12/gstorage /cifs/gstorage/ cifs
noauto,credentials=/root/gstorage.cred 0 0

Additionally, I can't reproduce the problem with a Win2k client by e.g.
using the search utility, like on Linux.

Very interesting is the following: If I experience a hang and produce some
other network traffic on this client
by either pinging another host or typing something into an ssh session it
continues immediately.
(E.g. if ping sends out some packets every second, the output will
continue once a second.)
Note that I've tried this only at one client/kernel, don't know if the
others behave the same way

If I should report this to the kernel mailing list, let me know, but you
might know better where it belongs.

mfg Wiesner

PS: Please CC me, as I'm not on the list.
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