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

[bert hubert <ahu@ds9a.nl>]

On Tue, Dec 28, 2004 at 12:24:01PM +0100, Gildas LE NADAN wrote:

> 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.

A trick is to enable alt-sysrq and press alt-sysrq-t (I think) which spams
your syslog with backtraces of all processes currently running, including
the ones stuck in 'D' state (ps aux | grep " D ").

If you isolate these backtraces and send them to this list, they will enable
developers to help you. Make sure you add 'includes backtrace' in your
Subject.

> 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.

For maximum usefulness, make your setup as simple as possible and reproduce.

Good luck - I personally can't help you in any real way, except to help you
get the debugging information that is needed.

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