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Re: [Xen-users] Dom0 crashes when Linux DomU started with WIN 2008 R2 DomU already up

On 13/06/13 16:56, Christophe Baegert wrote:
> Hi,
> I installed several Linux guests on a Xen 4.1  (4.1.4-3+deb7u1 exacty)
> with XL toolstack, on Debian Wheezy, on a 2x8 cores Opteron server
> (mainboard Supermicro H8DGU-F with latest Bios 3.0b).
> It worked fine with these guests for several weeks. Then I tried to
> install a Windows 2008 R2 Standard SP1 guest with HVM. The install
> begins fine, it copies the files, then reboots, then finishes the
> installation, then reboots again, and then, instead of the normal setup
> interface, it hangs for a last 10 minutes, with no VNC output, no Xen
> state reported, after that it displays indefinitely an horizontal moving
> ray of light (see http://pixoa.net/win2008.jpg).
> If I try to launch the other Linux DomU at this moment, after 3 or 5
> seconds, the physical server reboots, without any information.
> Even with safe mode, my Win guest can't finish the boot. It stops after
> loading drivers.
> I don't know if there are 2 problems (windows hang + physical reboot),
> or if the reason of these 2 problems is common.
> I already try to disable C1E in the BIOS. My clocksource is "xen". I see
> NOTHING in the logs, nor when Windows hang, nor when the Dom0 reboots of
> course. I already worked for 2 full days on this problem, but now I'm stuck.
> Any idea ?


I guess you already have a serial cable connected to the server, and you
see no output there before the reboot?

Could you try to install latest Xen from the unstable repository?


Or at least recompile your version of Xen with debugging enabled? (I
guess the version shipped on Debian doesn't come with debugging
enabled). Also add "noreboot=true" to the Xen boot parameters, so the
hypervisor doesn't automatically reboot.

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