Re: [Qemu-devel] [pve-devel] QEMU LIve Migration - swap_free: Bad swap file entry

[Stefan Priebe - Profihost AG <s.priebe@profihost.ag>]

Am 11.02.2014 14:32, schrieb Orit Wasserman:
> On 02/08/2014 09:23 PM, Stefan Priebe wrote:
>> i could fix it by explicitly disable xbzrle - it seems its
>> automatically on if i do not set the migration caps to false.
>>
>> So it seems to be a xbzrle bug.
>>
> 
> XBZRLE is disabled by default (actually all capabilities are off by
> default)
> What version of QEMU are you using that you need to disable it explicitly?
> Maybe you run migration with XBZRLE and canceled it, so it stays on?

No real idea why this happens - but yes this seems to be a problem for me.

But the bug in XBZRLE is still there ;-)

Stefan

> Orit
> 
>> Stefan
>>
>> Am 07.02.2014 21:10, schrieb Stefan Priebe:
>>> Am 07.02.2014 21:02, schrieb Dr. David Alan Gilbert:
>>>> * Stefan Priebe (s.priebe@profihost.ag) wrote:
>>>>> anything i could try or debug? to help to find the problem?
>>>>
>>>> I think the most useful would be to see if the problem is
>>>> a new problem in the 1.7 you're using or has existed
>>>> for a while; depending on the machine type you used, it might
>>>> be possible to load that image on an earlier (or newer) qemu
>>>> and try the same test, however if the problem doesn't
>>>> repeat reliably it can be hard.
>>>
>>> I've seen this first with Qemu 1.5 but was not able to reproduce it for
>>> month. 1.4 was working fine.
>>>
>>>> If you have any way of simplifying the configuration of the
>>>> VM it would be good; e.g. if you could get a failure on
>>>> something without graphics (-nographic) and USB.
>>>
>>> Sadly not ;-(
>>>
>>>> Dave
>>>>
>>>>>
>>>>> Stefan
>>>>>
>>>>> Am 07.02.2014 14:45, schrieb Stefan Priebe - Profihost AG:
>>>>>> it's always the same "pattern" there are too many 0 instead of X.
>>>>>>
>>>>>> only seen:
>>>>>>
>>>>>> read:0x0000000000000000 ... expected:0xffffffffffffffff
>>>>>>
>>>>>> or
>>>>>>
>>>>>> read:0xffffffff00000000 ... expected:0xffffffffffffffff
>>>>>>
>>>>>> or
>>>>>>
>>>>>> read:0x0000bf000000bf00 ... expected:0xffffbfffffffbfff
>>>>>>
>>>>>> or
>>>>>>
>>>>>> read:0x0000000000000000 ... expected:0xb5b5b5b5b5b5b5b5
>>>>>>
>>>>>> no idea if this helps.
>>>>>>
>>>>>> Stefan
>>>>>>
>>>>>> Am 07.02.2014 14:39, schrieb Stefan Priebe - Profihost AG:
>>>>>>> Hi,
>>>>>>> Am 07.02.2014 14:19, schrieb Paolo Bonzini:
>>>>>>>> Il 07/02/2014 14:04, Stefan Priebe - Profihost AG ha scritto:
>>>>>>>>> first of all i've now a memory image of a VM where i can
>>>>>>>>> reproduce it.
>>>>>>>>
>>>>>>>> You mean you start that VM with -incoming 'exec:cat
>>>>>>>> /path/to/vm.img'?
>>>>>>>> But google stress test doesn't report any error until you start
>>>>>>>> migration _and_ it finishes?
>>>>>>>
>>>>>>> Sorry no i meant i have a VM where i saved the memory to disk - so i
>>>>>>> don't need to wait hours until i can reproduce as it does not happen
>>>>>>> with a fresh started VM. So it's a state file i think.
>>>>>>>
>>>>>>>> Another test:
>>>>>>>>
>>>>>>>> - start the VM with -S, migrate, do errors appear on the
>>>>>>>> destination?
>>>>>>>
>>>>>>> I started with -S and the errors appear AFTER resuming/unpause
>>>>>>> the VM.
>>>>>>> So it is fine until i resume it on the "new" host.
>>>>>>>
>>>>>>> Stefan
>>>>>>>
>>>>>
>>>> -- 
>>>> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>>>>
>>
>