[Xen-users] Xen: DomU Core Dump

[aravindr <aravind.r@xxxxxxx>]

Hello All,

I have a Linux (redhat) DomU(HVM) running on Xen-3.3.1 (on a CentOS Dom0).

In the config file for this DomU, I have configured

and started the DomU.

Inside the DomU I do a
echo 'c' > /proc/sysrq-trigger
and the DomU crashes with a kernel panic. But there is no coredump generated nor is the DomU restarted!
I have modified in /etc/xen/xend-config.sxp enable-dump to yes and restarted xend.

Since DomU is getting started properly shows that Xend has recognized the option but it does not dump core
when the DomU crashes. So is there something I am missing or is this broken ?

I did some digging in xen-users listings and found the below bug that says Fully Virtualized guests cannot communicate a panic to Xen and hence
there is no core generated by Xen for the crashed DomU.

https://bugzilla.redhat.com/show_bug.cgi?id=216498

So I tried the same " with a PVM(Linux redhat). And here also xen was not able to generate a core dump when the PVM kernel panicked.

I also wrote a small module which calls BUG() and panicks the kernel but same results, Xen is not able to determine that DomU has crashed.
Any thoughts, ideas?
So if anyone knows what I am missing here please point me in the right direction. Any help is greatly thanked :)


Best of Regards,
Aravind

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