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Re: [Xen-devel] Question about Xen reboot on panic

Hi Andrew,

First, thank you so much for your super fast reply! I really appreciate it. :-)

2015-11-11 17:54 GMT-05:00 Andrew Cooper <andrew.cooper3@xxxxxxxxxx>:
> On 11/11/2015 22:49, Meng Xu wrote:
>> Hi all,
>> I'm trying to work remotely with the machine I have. So I want Xen
>> automatically reboot if it experiences a panic.
>> When Xen panic, it says " Reboot in five seconds...". However, it does
>> not reboot. :-(
>> *** The xen boot command line on my machine is ***
>> multiboot   /boot/xen-4.6-unstable.gz placeholder
>> dom0_mem=8192M,max:8192M dom0_max_vcpus=8 sched=credit
>> com1=115200,8n1,pci console=com1,vga reboot=k panic=2 panic_on_oops=1
> Xen has no panic= or panic_on_oops= command line options.
> Please read the command line
> documentation(http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html).
> It is written and kept up to date for a reason.

Yes, I actually read it before I put the command options. I'm not
quite sure if it is most updated and I was hoping "what if it works".
Now I know it won't work for sure.

> Furthermore, you are force-overriding the normal reboot path with the
> keyboard controller.  You shouldn't need to do this unless you have some
> very wonky firmware.

I see. I removed it from the boot command line.

> Finally, I can't tell from your paste below, but ensure that you are
> always using a debug hypervisor.

The source file Config.mk under the xen folder has
debug ?= y

In addition,  "xl dmesg |grep debug" gives me:

(XEN) Xen version 4.6-unstable (root@) (gcc (Ubuntu/Linaro
4.6.3-1ubuntu5) 4.6.3) debug=y Wed Nov 11 17:06:30 EST 2015

So I guess I'm using the debug hypervisor.

I reboot the system after removing all of those useless options (that
is, no more "reboot=k panic=2 panic_on_oops=1" in the Xen boot command

Is there anything else I can do to force Xen always reboot at panic or oops?

Thank you very much for your help!




Meng Xu
PhD Student in Computer and Information Science
University of Pennsylvania

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