Re: hang on reboot with 3.6-rc1

[Alex Williamson <alex.williamson@redhat.com>]

On Thu, 2012-08-09 at 12:17 -0600, David Ahern wrote:
> On 8/9/12 11:26 AM, Alex Williamson wrote:
> > On Thu, 2012-08-09 at 11:10 -0600, David Ahern wrote:
> >> On 8/9/12 3:42 AM, Avi Kivity wrote:
> >>> On 08/08/2012 07:27 PM, David Ahern wrote:
> >>>> Not sure if KVM is the culprit, but it is the last line shown on the
> >>>> console. I have to power cycle the server to reboot.
> >>>
> >>> Have you tried rmmoding the kvm modules before reboot?
> >>>
> >>> Were any guests running during this?
> >>
> >> hmm.... seems to be a side effect of https://lkml.org/lkml/2012/8/3/370.
> >
> > Is it fixed with the patches for that?  We're operating on a NULL
> > pointer with that bug on your system, so you probably don't want to be
> > assuming the system is entirely healthy after you hit it.  Thanks,
> 
> 
> Agreed and yes.
> 
> Latest Linus tree has the iommu patch. Still need to get the other one 
> in (https://lkml.org/lkml/2012/8/4/141) or whatever alternative is 
> deemed better.

I think you should be ok with just what is in Linus' tree now.  The
change in pci_acs_path_enabled is the same kind of bug, but I don't
think you'll hit it with the fixed iommu code.  Please let me know if
that's not the case.  Thanks,

Alex