Re: Hard and silent lock up since linux 3.14 with PCIe pass through (vfio)

[Andreas Hartmann <andihartmann@freenet.de>]

Bjorn Helgaas wrote:
> On Fri, Oct 10, 2014 at 8:49 AM, Andreas Hartmann
> <andihartmann@freenet.de> wrote:
>> Bjorn Helgaas wrote:
>>> On Fri, Oct 10, 2014 at 3:39 AM, Andreas Hartmann
>>> <andihartmann@freenet.de> wrote:
>>>> shortly: I retested w/ qemu 2.1.0 and Linux 3.17.0 - no change in behaviour.
>>>>
>>>> Alex Williamson wrote:
>>>>> On Tue, 2014-09-23 at 21:03 +0200, Andreas Hartmann wrote:
>>>>>> Hello!
>>>>>>
>>>>>> Since long time now, I'm using w/o any problem PCIe pass through with a
>>>>>> Gigabyte GA-990XA-UD3/GA-990XA-UD3 mainboard (AMD 990X chipset) and
>>>>>> enabled IOMMU with vfio-pci.
>>>>>>
>>>>>> The last kernel working w/o any problem is kernel 3.13.7 (I didn't use
>>>>>> .8 and .9, but I do not think they would have been problematic).
>>>>>>
>>>>>> Since 3.14.19 (I didn't test any 3.14 kernel before) I'm encountering a
>>>>>> hard and silent lock up of the complete machine when starting the VM
>>>>>> with the PCIe card passed through.
>>>
>>> Since we're not really making any progress on this yet, would it be
>>> possible to bisect it?  We already know that 3.13.7 works and 3.14.19
>>> fails, and "git bisect start v3.14 v3.13" says it's about 13 steps.  I
>>> know that's still quite a bit of work, but at least it sounds like the
>>> problem is easy to reproduce.
>>
>> Which git repository should I use best?
> 
> The linux-stable repository [1] contains both the v3.13.x and the
> v3.14.x branches, but apparently you can't bisect directly between
> v3.13.7 and v3.14.19:

I know that the first version after 3.13.0 (patch-v3.13-next-20140121)
is already broken. Therefore, it must be between 3.13.7 and
patch-v3.13-next-20140121.



Thanks,
regards,
Andreas