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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

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

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:
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

Thanks in advance for all your help.


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 ;)


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