Re: unkillable processes using samba, xfs and lvm2 snapshots (k 2.6.10)

[Christoph Hellwig <hch@infradead.org>]

On Tue, Dec 28, 2004 at 12:24:01PM +0100, Gildas LE NADAN wrote:
> Hi,
> 
> I experience hangs on samba processes on a filer using xfs over lvm2 as 
> data partitions, when there is active snapshots of the xfs partitions.
> 
> I have a clone of the production server (same software, same hardware) 
> where the situation can be reproduced perfectly.
> 
> Testings showed that the result was the same, whether the snapshots were 
> mounted or not : smbd processes are locked and unkillable while the 
> machine is normaly working otherwise, except software reboot is 
> impossible and hardware reset is needed.
> 
> I noticed Brad Fitzpatrick's case in kernel 2.6.10 changelog 
> (http://lkml.org/lkml/2004/11/14/98) and tested kernel 2.6.10 today 
> without success.
> 
> Configuration is the following :
> - supermicro m/b with dual Xeon 2,8Ghz (SMT is active)
> - 1 GB ram,
> - adaptec u320 raid controler
> - kernel 2.6.10
> - debian sarge
> - samba 3
> - LVM2
> - XFS with quota turned on
> 
> All software are from debian sarge packages, except the kernel.
> 
> I'm not able to determine if the problem is more xfs, device mapper or 
> samba related, and was not able to do extensive testings (using a 
> different filesystem, testing with a different daemon, etc...), but 
> SMT/SMP testings showed that this is not a SMP/SMT related problem.
> 
> I've compiled the kernel with the debugging options, so I might provide 
> additional informations if needed as in Brad's case.

I'll try to reproduce your problems soon.