RE: [PANIC, hyperv] BUG: unable to handle kernel paging request at ffff880077800004 (hv_ringbuffer_write)

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> -----Original Message-----
> From: Sitsofe Wheeler
> Sent: Wednesday, August 20, 2014 19:40 PM
> > I suppose you're using  the latest mainline v3.17-rc1(7d1311b9).
> 
> That's right - Linux 3.17-rc1
> (7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9).
Ok, let me try to reproduce it first.

> > Can you please attach your kernel config file so that I can try to reproduce
> > the issue more easily?
> 
> Sure (it's pretty much the same one mentioned in
> https://lkml.org/lkml/2014/8/19/101 and
> https://lkml.org/lkml/2014/8/19/708 but those don't seem framebuffer
> related) but just in case I'll attach it to this mail.
Thanks for the info! 

> > Do you mean the issue only happens to UP guest and doesn't happen to
> > SMP guest?
> 
> Yes - if in Windows I go to Hyper-V Manager, press the right mouse
> button over the guest and go to Settings..., click on Processor at the
> left and set the Number of virtual processors to 1 on the right then
> this issue occurs. If the number is greater than 1 then this does not
> seem to occur.
It's strange SMP guest is ok while UP is not ok. :-(

Thanks,
-- Dexuan
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