computer stalls instead of reboot

["Sven Köhler" <sven.koehler@gmail.com>]

Hi,

I'm still seeing a very strange issue here. First, let's clarify that
the issue has never occurred with the good old xen 3.x and the good old
2.6.18 kernel.

So the issue is, that with xen 4.x (including 4.1.1) pretty much any
kernel (including kernel from [1] and vanilla 3.0.0, didn't test the
2.6.18), the machine freezes during a reboot. The machine won't come up
again, not even the BIOS screen will show.

It doesn't happen when running the kernel on bare metal. Also the fact
that it doesn't happen with xen 3.x + 2.6.18 might meen, that this is a
regression of some sort.

This issue has prevented my move from xen 3.x to xen 4.x for many years
now. I already asked about this issue, and nobody replied. So I hoped,
that the kernel from kernel.org would solve this, once that pvops dom0
enabled kernels were available. Well, it didn't. I'm still stuck with
this issue. Every time I want to reboot my machine, I have to call my
hosting company to reboot the server.

It's a MSI X58 Pro-E (MS-7522) motherboard, equipped with Intel Core i7
920 and an nvidia graphics card.

Did anybody ever experience a similar issue?
Does anybody have any suggestions how to continue?

This seems to be a very weired issue, and even pushing the computers
reset button doesn't seem to help. (It's a remote machine, and I can
remotely push the reset button).

I have already updated the BIOS, and disabled virtualization (only
paravirt domUs). However, no improvement.


Kind Regards,
  Sven


[1] http://code.google.com/p/gentoo-xen-kernel/