Re: [Xen-devel] Severe guest disk corruption with device_model_stubdomain_override=1...

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Wed, Mar 23, 2016 at 9:46 PM, Sarah Newman <srn@xxxxxxxxx> wrote:
> On 03/22/2016 11:03 PM, Sarah Newman wrote:
>> And nested xen.
>>
>> CPU: AMD Opteron 2352
>> Outer configuration: Xen4CentOS 6 xen 4.6.1-2.el6, linux 
>> 3.18.25-18.el6.x86_64
>> Inner configuration: Xen4CentOS 6 xen 4.6.1-2.el6, linux 
>> 3.18.25-19.el6.x86_64
>> Inner xen command line:  cpuinfo loglvl=all guest_loglvl=error 
>> dom0_mem=512M,max:512M com1=115200,8n1 console=com1 dom0_max_vcpus=1 
>> dom0_vcpus_pin=true
>> Inner linux command line: ro root=LABEL=DISK rootflags=barrier=0 
>> swiotlb=32768 console=hvc0
>
>> xen_platform_pci seems to be ignored with 
>> device_model_stubdomain_override=1. So I don't think I can test what happens 
>> with the 3.18.25-19.el6.x86_64
>> kernel, no nested xen, and non-paravirtual block devices.
>
> The patch submitted in 
> http://lists.xenproject.org/archives/html/xen-devel/2016-03/msg03080.html 
> appears to fix the issue.

This is the best kind of bug report to come in to find in the morning
-- reported, then fix posted. :-)

But your patch to minios is for the netfront driver -- why would that
cause a fault in the emulated disk?  Did the guest hang because the
stubdomain was spinning rather than handling requests?

 -George

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