Re: [Xen-users] Debugging Xen crash

[Francis Pereira <francispereira@xxxxxxxxxxxxxx>]

On Thu, Aug 16, 2012 at 2:22 PM, Mark van Dijk <lists+xen@xxxxxxxxxxxxxx> wrote:

On Thu, 16 Aug 2012 12:58:51 +0530
Francis Pereira <francispereira@xxxxxxxxxxxxxx> wrote:

> I had a server simply "freeze" yesterday - no response from dom0 or
> domU. There is nothing  suspicious (out of the ordinary)
> in /var/log/kern, xcp-xapi and syslog in dom0, domU and physical
> server' logs. Looks like the running system simply hung and a reboot
> was required. Can someone point me to documentation or tips on how to
> debug such lockups in Xen environment.

Hi Francis, maybe these pages can help:

http://wiki.xen.org/wiki/Xen_Serial_Console
and
http://wiki.xensource.com/xenwiki/XenParavirtOps.html#head-9fb34d1cf597800d371b844568797d4db8587dce

Kind regards,
Mark

 

Hi Mark,

A serial console  is not very scalable especially if random servers hang/reboot every now and them. I want to have a process in place where every-time a dom0 or Xen kernel freezes - a core dump is automatically generated. I have been reading about kdump and kexec, while its fairly straight forward for a normal Linux kernel that is booted on bare hardware, I don't understand how to set it up correctly with Xen and dom0. Google searches for kdump and Xen provide results for Xen 3.x. Some results seem to suggest that there is a kdump port for Xen.  Can someone point me to latest documentation on kdump and Xen. 

XenServer appears to use kdump ( I can see crashkernel= in the kernel line) to generate a crash dump which can be used by support to debug but I am not sure how they have put it all together

~Francis

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