Re: [Xen-Users] System reboots after "Scrubbing free RAM" Xen 4.0.1 linux 2.6.37-rc3, crash with less than 16 GB of dom0_mem

[Joaquin Fernandez Piqueras <jfernandez@xxxxxxxxxxx>]

Al 25/11/10 09:13, En/na Pasi Kärkkäinen ha escrit:
> On Thu, Nov 25, 2010 at 09:06:11AM +0100, Joaquin Fernandez Piqueras wrote:
> > Al 25/11/10 00:16, En/na Marek Kaszycki ha escrit:
> > > Hi Everyone
> > >
> > > I have sorted out the initial issues I've had and decided to give Xen
> > > another go.
> > >
> > > I'm trying to run Xen using kernel 2.6.37-rc3 (previous attempt with
> > > rc1 failed, and when I gave it a second go, rc3 was already out).
> > >
> > > As previously, 2.6.37-rc3 boots fine natively. 2.6.32 boots natively
> > > and under Xen as dom0, but I have reservations against running 2.6.32,
> > > please bear with me.
> > > Booting 2.6.37-rc3 under Xen (4.0.1-1, squeeze) causes a reboot right
> > > after "Scrubbing free RAM" appears -- I believe some tables appear
> > > just to blink on the screen right afterwards, but I am unable to
> > > confirm just what exactly is there -- I don't have a serial console
> > > attached -- so I am unable to capture the output from Xen or dom0.
> > >
> > > I am at a loss as to what causes this. I have compiled the kernel
> > > myself, following the advice on
> > > http://wiki.xen.org/xenwiki/XenParavirtOps
> > >
> > > Since there are additional lines after the error message, I believe
> > > the hypervisor completes its init and the reboot happens just when the
> > > hypervisor wants to boot dom0.
> > >
> > > I have checked the threads:
> > > http://lists.xensource.com/archives/html/xen-users/2010-11/msg00420.html
> > > http://lists.xensource.com/archives/html/xen-devel/2010-04/msg01227.html
> > > My system has just 8 GB of RAM and just one CPU. Following the advice,
> > > I have added 'noreboot' to Xen entry in grub.cfg, but even though Xen
> > > doesn't reboot the system now, it's worse because right after
> > > "Scrubbing free RAM", the screen goes blank, no cursor or anything,
> > > and just stays this way.
> > >
> > > I have uploaded the grub.cfg and kernel .config to the following
> > > locations:
> > > http://www.kaszycki.pl/xen/grub.cfg
> > > http://www.kaszycki.pl/xen/kconfig
> > >
> > > Thanks in advance for all your help.
> > Hi,
> >
> > I have the same issue with a server with 32GB of RAM. In my case the
> > system reboots after "Scrubbing free RAM" when the dom0_mem parameter is
> > 16GB or less. I don't know if my problem is related , but I
> > workarrounded it setting dom0_mem=17GB and when the system boots I
> > decrease this value to 2GB with the "xm mem-set" command.
> >
> > It's not the best solution, but really I don't know how to get the
> > "dom0_mem=2GB" work.
> This sounds like a bug.
> What dom0 kernel version were you running?
> Can you post the serial log about the crash?
>
> I added xen-devel as CC.
My dom0 kernel is 2.6.32 from debian squeeze amd64.
I'm working to obtain the serial log. It's not an easy task ;)

Quimi


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