kernel bug in "Drop WIMG in favour of new constants"?

[Aneesh Kumar K.V]

"Darrick J. Wong" <darrick.wong at oracle.com> writes:

> On Thu, Jun 16, 2016 at 03:23:47PM +1000, Michael Ellerman wrote:
>> On Wed, 2016-06-15 at 21:33 -0700, Darrick J. Wong wrote:
>> 
>> > Hi Aneesh,
>> > 
>> > I noticed when trying out 4.7-rc3 on qemu-2.5 that the kernel no longer
>> > boots.  4.6 booted just fine, so I bisected the kernel to the commit
>> > 30bda41aba4efb2370c97e2cbe7385de93ccc372, which is "powerpc/mm: Drop WIMG in
>> > favour of new constants".  The changelog suggests that the KVM changes need
>> > closer review, and here's an actual crash:
>> > 
>> > (I can send libvirt's machine xml, .config, and full dmesg if that helps.)
>> 
>> Yes please.
>> 
>> I'm successfully booting 4.7-rc's on qemu (2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.1)).
>
> Ok, see attached.  I also sent along the dpkg --status output for qemu
> and qemu-slof; looks like we're running the same Ubuntu packages...
>
> ...my host kernel is 4.6.0 on x64.

So this is Qemu TCG mode right ? I will try some test and update later.

-aneesh