[Xen-users] Kernel panic recoverable by hitting <enter>?

["Tobias F. Leucht" <xen@xxxxxxxxxx>]

Hi *,

I'm running several xenified systems [UP|SMP]/[P4,Athlon,Xeon] from 
multiple maufacturers [HP,Intel,IBM,Dell] in different CoLos since early 
2004 24/7 in test as well as production scenarios without any noteworthy 
problems.
But, suddenly, a Dell PowerEdge 1750 equipped with SMP Xeon@xxxxxxx and 
4GB DDR ECC RAM (from crucial.com) running under xen-2.0.5 with 
2.6.10-xen0 on Debian Sarge and carrying 22 domUs [Sarge|FC4|*BSD] under 
medium load disappeared this afternoon from the network - both the dom0 
and all domUs.
The remote-hands service claimed that there was a kernel panic on the 
system's console showing loads of hexdumps and something related to 
'memory stack' - unfotunately, the guy couldn't remember exactly what 
was shown on the screen [and, sadly, I've no serial console attached to 
that machine and no terminal server, of course ;-)].
Now the odd part, at least for me as I never heard of such a thing: the 
technician also claimed that, after pressing the enter key, the system 
returned to 'normal operation' and showed a conosle login.
When the machine reappeared back on the net it looked like as if nothing 
had happened: Uptime of dom0 is still >90 days, neither the logs of dom0 
nor those of the domUs show any suspicious entries - except some of the 
domU's services complaining about the lack of network connectivity 
(openvpn, etc...).
Do you guys have heard of user-confirmable kernel panics? (I just 
grepped through the xen- and linux-sources but found nothing; Google 
wasn't of much help, either.)
Was the remote-hands-guy telling me fary tales merely to draw off 
attention from some colo-internal network problems? Or could that be a 
xen-specific experience? How to track that down?
Regards,

Tobias

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