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Re: [Xen-devel] Bug: xl create pv domain with qcow2 disk crashes dom0

On Thu, Oct 16, 2014 at 6:17 PM, George Dunlap
<George.Dunlap@xxxxxxxxxxxxx> wrote:
> On Thu, Oct 16, 2014 at 6:12 PM, George Dunlap
> <george.dunlap@xxxxxxxxxxxxx> wrote:
>> On 10/16/2014 06:07 PM, Andrew Cooper wrote:
>>> On 16/10/14 18:02, George Dunlap wrote:
>>>> System RAM resource [mem 0x48000000-0x4fffffff] cannot be added
>>>> xen_balloon: reserve_additional_memory: add_memory() failed: -17
>>>> WARNING: g.e. 0x13 still in use!
>>> At a glance, I suspect that this is the root of the problem.  An
>>> -EEXISTs in the balloon driver, and perhaps a buggy error path?
>>> ~Andrew
>> FWIW I just tried this again with the Xen4CentOS 4.2.5 packages (same
>> kernel), and it works fine -- so this seems to be a regression in Xen /
>> libxl / xl somewhere.
> ...or possibly, in blktap: The x4c packages shove in some blktap 2.5
> code they got from XenServer I think.


BTW, this is definitely in qdisk, not blktap; blktap2 (and 2.5) don't
support qcow2.


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