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Re: [Xen-users] Dom0 Hangs while booting

Thanks for the response I'll start with those commands to see if I can learn anything new.
The host has 2 sockets with 6 cores per socket for 12 physical cores, 24 logical cores with hyper threading.

On Thu, Jul 2, 2015 at 5:03 AM Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
On Thu, 2015-07-02 at 00:26 +0000, Josh Drenan wrote:
> Greetings all I have an error where dom0Â freezes during boot and was
> wondering if anyone could help. I have tried using most of the acpi
> command line options to no avail.
> I am trying to boot xen as a virtual machine inside of ESXI, it works
> if the total number of cores is less than or equal to 8 but no more
> for some reason.
> I have included the log from the boot.

How many cores (physical and hyperthreaded) does the host have?

I'm afraid I've no idea what's going on, but some things which might
give some clues:

Magic Sysrq to dom0, the keystroke for a Xen hvc console is Ctrl-o, then
the usual set of letters (h for help). Depending on kernel version you
might need "sysrq_always_enabled" and/or "kernel.sysrq=1" on your dom0
command line else it'll just say it's not allowed. Interesting ones
would be the key which gives you a backtraces on all cpus, or shows you
all waiting processes.

Secondly on the Xen console you can press Ctrl-a 3 times (by default,
xen's conswitch option can change it) to switch to Xen debug key mode,
at which point h gets you help and there are various helpful keys you
can press, 'd', 'q' and '0' being the ones I usually find useful stuff
in. '*' gets you everything.

Perhaps somewhere in all that there might be some hint what is going on.


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