Re: 3.9 / 3.10: Reliable host crashes

[Gleb Natapov <gleb@redhat.com>]

On Wed, Jul 10, 2013 at 06:23:26PM +0200, Bernd Schubert wrote:
> On 07/10/2013 06:16 PM, Gleb Natapov wrote:
> >On Wed, Jul 10, 2013 at 06:06:27PM +0200, Bernd Schubert wrote:
> >>On 07/10/2013 06:02 PM, Gleb Natapov wrote:
> >>>On Wed, Jul 10, 2013 at 04:16:46PM +0200, Bernd Schubert wrote:
> >>>>Hi all,
> >>>>
> >>>>I found a way to reliably crash my host system:
> >>>>
> >>>>1) Boot guest VM with init=/bin/bash
> >>>>
> >>>>2) In guest VM: echo b >/proc/sysrq-trigger
> >>>>
> >>>>3) Try to reboot the guest -> crashes the host during kernel initialization
> >>>>
> >>>What 3 means? 2 already reboots it.
> >>
> >>Sorry, not a good wording. The guest reboots, goes through grub,
> >>starts the kernel and the host then crashes during early
> >>initialization of the guest kernel.
> >And if you boot it without init= first and just reboot it with "reboot"
> >does the same happens?
> 
> I currently need the host and the VMs, so I can't try that right now.
> 
> >
> >Can your attach your .config here? Also can you compile KSM out and
> >retry?
> 
> The host config ist attached.
> 
> I probably will only manage to test that on Friday afternoon, I
> guess only the host KSM is important?
> 
Yes.

--
			Gleb.