Date: Sat, 5 Mar 2005 10:06:37 +0100
From: Florian Engelhardt <flo@dotbox.org>
To: linux-kernel@vger.kernel.org
Cc: Brad Campbell <brad@wasp.net.au>
Subject: Re: freezes with reiser4 in a raid1 with 2.6.11-rc5-mm1
Message-ID: <20050305100637.3aa6e1b8@discovery.hal.lan>
In-Reply-To: <422597C3.5020207@wasp.net.au>
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	<422597C3.5020207@wasp.net.au>
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Hello,

On Wed, 02 Mar 2005 14:38:59 +0400
Brad Campbell <brad@wasp.net.au> wrote:

> Florian Engelhardt wrote:
> > 
> > I activated the raid (/dev/md0), then mounted it, and after
> > that i was starting nfs. I was able to mount the share
> > on my desktop, creating direcrotys was no problem, but
> > as soon as i was copying a file to the share, the server
> > freezed.
> > Creating files localy (while loged in via ssh) is leading
> > to the process is staying in state D.
> > Sometimes, when i start nfsd, the system reboots immediately,
> > sometimes not.
> > At the momment, most of the processes are in state D, reboot
> > does not work, and i am not at home, so i am unable to reboot
> > the machine manualy.
> 
> Neat trick which I only discovered in desparation last week when
> battling a RAID lockup on the -rc4-mm1 kernel on a remote box.
> 
> I was also having hard lockup issues, but reseating all my PCI cards
> appear to have rectified that one.

Well, there are not much PCI-Cards in this server and reseating them
didnt fix it.

> As root. echo b > /proc/sysrq-trigger
> 
> Of course only if you have alt-sysrq built in.

Thanks for that, i was able to reboot the machine with that trick, but
i couldnt find anything bad in the messages file.

I made some further tests with the server:
Deactivating the raid, and formating the hd?s (hdc and hdd) with
reiser4, mounting them and sharing them via nfs and ftp worked great, no
freezes, no reboots, everything perfect, even the performance.
But as soon, as i activated the raid, the server freezed, or rebooted.

Maybe this problem is not a bug in a single component (eg: nfs or
reiser4), i think it is the combination of linux raid with reiser4, but
i dont know.
I will try to get the raid up and running with ext3 and/or jfs.

Then we know exactly, if it is the combination of raid and reiser4.

Kind regards

Florian Engelhardt

-- 
"I may have invented it, but Bill made it famous"
David Bradley, who invented the (in)famous ctrl-alt-del key combination
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