Re: [MirageOS-devel] Unikernel crashes (compiled to Xen)

[JIM Yuan <jy378@xxxxxxxxx>]

Just an update on this.

I tried to run this on Ubuntu 14.04 with Xen 4.4. It works :)

Best,

Junwei

> On 2 Feb 2018, at 19:25, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:
> 
> 
> 
>> On 2 Feb 2018, at 19:07, Richard Mortier <richard.mortier@xxxxxxxxxxxx> 
>> wrote:
>> 
>> On 02/02/2018 18:17, Mindy Preston wrote:
>>> On 02/02/18 06:32, JIM Yuan wrote:
>>>> Hi,
>>>> 
>>>> I installed Xen on Ubuntu 16.04 Server, which runs as a VM in VirtualBox 
>>>> 5.2.6 on macOS.
>>> I think nested virtualization (running Xen within another hypervisor) is 
>>> not very well supported (perhaps someone more familiar with the current 
>>> state of nested virt in Xen can comment more?), and I'm not surprised that 
>>> there are problems with a unikernel that tries to use network resources 
>>> there.  I would recommend trying with a hypervisor running directly on 
>>> hardware, not virtualized itself.
>> 
>> FWIW that used to work, at least for me. I will admit to not having done it 
>> recently though, so perhaps somewhere in changes to OSX, Virtualbox, Xen and 
>> Mirage over the last year or two, things have changed.
> 
> Indeed — this doesn’t look like a nested virt crash to me, since it has 
> attached to netfront and is crashing quite late in boot.  I’ll see if I can 
> reproduce it later, as I’m suspicious that this might be due to a change 
> somewhere in newer Xen device models.  It’s hard to tell without a gdb 
> backtrace for sure where it’s crashing.
> 
> Anil
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