Re: [Xen-devel] null domains after xl destroy

[Juergen Gross <jgross@xxxxxxxx>]

On 04/05/17 00:17, Glenn Enright wrote:
> On 04/05/17 04:58, Steven Haigh wrote:
>> On 04/05/17 01:53, Juergen Gross wrote:
>>> On 03/05/17 12:45, Steven Haigh wrote:
>>>> Just wanted to give this a little nudge now people seem to be back on
>>>> deck...
>>>
>>> Glenn, could you please give the attached patch a try?
>>>
>>> It should be applied on top of the other correction, the old debug
>>> patch should not be applied.
>>>
>>> I have added some debug output to make sure we see what is happening.
>>
>> This patch is included in kernel-xen-4.9.26-1
>>
>> It should be in the repos now.
>>
> 
> Still seeing the same issue. Without the extra debug patch all I see in
> the logs after destroy is this...
> 
> xen-blkback: xen_blkif_disconnect: busy
> xen-blkback: xen_blkif_free: delayed = 0

Hmm, to me it seems as if some grant isn't being unmapped.

Looking at gnttab_unmap_refs_async() I wonder how this is supposed to
work:

I don't see how a grant would ever be unmapped in case of
page_count(item->pages[pc]) > 1 in __gnttab_unmap_refs_async(). All it
does is deferring the call to the unmap operation again and again. Or
am I missing something here?


Juergen

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