Re: [Xen-devel] Tapdisk failures / kernel general protection fault at xen 4.0.2rc3 / kernel pvops 2.6.32.36

[Gerd Jakobovitsch <gerd@xxxxxxxxxxx>]

Hello Daniel:

I applied the patch and the bug at VM startup was solved. Thank you for 
your help.
Regards

Gerd

On 04/14/2011 02:43 PM, Daniel Stodden wrote:
> On Thu, 2011-04-14 at 12:38 -0400, Daniel Stodden wrote:
> > On Thu, 2011-04-14 at 09:15 -0400, Konrad Rzeszutek Wilk wrote:
> > > On Wed, Apr 13, 2011 at 06:02:13PM -0300, Gerd Jakobovitsch wrote:
> > > > I'm trying to run several VMs (linux hvm, with tapdisk:aio disks at
> > > > a storage over nfs) on a CentOS system, using the up-to-date version
> > > > of xen 4.0 / kernel pvops 2.6.32.x stable. With a configuration
> > > > without (most of) debug activated, I can start several instances -
> > > > I'm running 7 of them - but shortly afterwards the system stops
> > > > responding. I can't find any information on this.
> > > First time I see it.
> > > > Activating several debug configuration items, among them
> > > > DEBUG_PAGEALLOC, I get an exception as soon as I try to start up a
> > > > VM. The system reboots.
> > > Oooh, and is the log below from that situation?
> > >
> > > Daniel, any thoughs?
> > ---
> >           Unmap pages from the kernel linear mapping after free_pages().
> >           This results in a large slowdown, but helps to find certain types
> >           of memory corruption.
> >
> > Stunning. Our I/O page allocator is a sort of twisted mempool. Unless
> > the allocation is explicitly modified in sysfs/, everything should stay
> > pinned. We might be just tripping over debug code alone, but I didn't
> > figure it out yet.
> Ah, that's just missing Dominic's spinlock fix.
>
> http://xenbits.xen.org/gitweb/?p=people/dstodden/linux.git;a=commit;h=a765257af7e28c41bd776c3e03615539597eb592
>
> Daniel


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