[linux-cifs-client] Re: linux-cifs-client Digest, Vol 3, Issue 7

[Steve French]

I am having a difficult time reproducing that problem on something
debuggable.  I was able reproduce it on stock 2.4.22 kernel from
kernel.org but did not have kgdb for 2.4.22 so installing a stock 2.4.23
kernel and adding the kgdb patch (http://kgdb.sourceforge.net/) I
expected to be able to reproduce the hang and debug it but the problem
did not fail on 2.4.23 (or 2.6 for that matter).  I don't think it
happened on another kernel version that I tried on another machine
either?  Tracing on the server side it is odd - it happens immediately
after the response from the first open (SMB NTCreateX) or write (SMB
WriteX) is processed but doing the divide and conquer printk approach
isn't helping much even with sleeps after the printks to make sure the
dmesg output gets written.

One thing I need to check was whether the hang only occurred to Windows
2000 (rather than Samba with the Unix extensions enabled in smb.conf?)
servers that might lead me to debugging a non-Unix extension path in the
2.4 code.

On another topic - I also noticed that there are still problems with the
search code on large directories in 2.4 due to the end of search flag
being turned on on the server (after end of search is returned, resuming
from a previous entry fails due to in effect an invalid handle - so I
need to simply add code to close and reopen the search handle and then
resume - should not be too hard)

> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Mon, 09 Feb 2004 15:04:39 +0100
> From: Massimiliano Ferrero <m.ferrero at midhgard.it>
> Subject: [linux-cifs-client] CIFS and kernel 2.4.23 or 2.4.24 hangs up
> To: linux-cifs-client at lists.samba.org
> Message-ID: <40279377.5000502 at midhgard.it>
> Content-Type: text/plain; charset=us-ascii; format=flowed
> 
> Hello,
> 
> I'm experiencing the same problem as Breno Moiana (message from some 
> days ago): I'm using debian stable, compiled kernel 2.4.23 and 2.4.24 
> with cifs patch (form kernel.org)
> mount.cifs helper compiled from sources
> 
> When I mount with:
> mount.cifs //ip/share /mountpoint -o username=blabla
> 
> The system hangs up the moment I (try to) copy a file.
> Listing them is ok
> 
> Enabling
> echo 1 > /proc/fs/cifs/cifsFYI
> echo 1 > /proc/fs/cifs/traceSMB
> 
> Does not show anything
> 
> I've tried:
> - cifs as module and statically compiled in the kernel
> - cifs 1.0.2b and cvs sources
> - kernel with devfs and without
> - loading module nls_cp437 before mount
> 
> No difference.
> 
> kernel 2.6.1 works but I would avoid it for other reasons
> 
> The kernel is optimized for PIII, this night I'll try to compile it for 
> plain i386
> I'll try also to sniff packets with ethereal.
> If I have time I want also to start from a debian kernel source.
> 
> I don't know how to enable remote debugging, any link?
> 
> BTW: the problem shows up with two different linux machines versus two 
> different Windows 2000 servers.
> 
> Tell me if you need config files for the kernel. I'm also willing to put 
> the kernel image for download.
> 
> Could kernel 2.4.21 make any difference? Unfortunatly solving this 
> problem for me is quite urgent (I risk blowing up a whole project).
> Even a temporary workaround would be sufficient: i need to mount a 
> remote share and backup directly to tape a 23 GB file from a Windows 
> 2000 server. CIFS is the only possibility I've found so far.
> 
> Best regards and thanks in advance
> Massimiliano Ferrero