Re: Biweekly KVM Test report, kernel 51bfd299... qemu a1fce560...

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2012-06-01 09:57, Ren, Yongjie wrote:
>> -----Original Message-----
>> From: Marcelo Tosatti [mailto:mtosatti@redhat.com]
>> Sent: Thursday, May 31, 2012 4:28 AM
>> To: Ren, Yongjie
>> Cc: Kevin Wolf; Avi Kivity; kvm@vger.kernel.org; Liu, RongrongX
>> Subject: Re: Biweekly KVM Test report, kernel 51bfd299... qemu
>> a1fce560...
>>
>> On Tue, May 22, 2012 at 07:40:29AM +0000, Ren, Yongjie wrote:
>>>> -----Original Message-----
>>>> From: Kevin Wolf [mailto:kwolf@redhat.com]
>>>> Sent: Monday, May 21, 2012 11:30 PM
>>>> To: Ren, Yongjie
>>>> Cc: Avi Kivity; kvm@vger.kernel.org; Liu, RongrongX
>>>> Subject: Re: Biweekly KVM Test report, kernel 51bfd299... qemu
>>>> a1fce560...
>>>>
>>>> Am 21.05.2012 11:45, schrieb Ren, Yongjie:
>>>>>> -----Original Message-----
>>>>>> From: Kevin Wolf [mailto:kwolf@redhat.com]
>>>>>> Sent: Monday, May 21, 2012 5:05 PM
>>>>>> To: Avi Kivity
>>>>>> Cc: Ren, Yongjie; kvm@vger.kernel.org
>>>>>> Subject: Re: Biweekly KVM Test report, kernel 51bfd299... qemu
>>>>>> a1fce560...
>>>>>>
>>>>>> Am 21.05.2012 10:27, schrieb Avi Kivity:
>>>>>>> On 05/21/2012 06:34 AM, Ren, Yongjie wrote:
>>>>>>>> Hi All,
>>>>>>>>
>>>>>>>> This is KVM upstream test result against kvm.git
>>>>>> 51bfd2998113e1f8ce8dcf853407b76a04b5f2a0 based on kernel
>>>> 3.4.0-rc7,
>>>>>> and qemu-kvm.git a1fce560c0e5f287ed65d2aaadb3e59578aaa983.
>>>>>>>>
>>>>>>>> We found 1 new bug and 1 bug got fixed in the past two weeks.
>>>>>>>>
>>>>>>>> New issue (1):
>>>>>>>> 1. disk error when guest boot up via qcow2 image
>>>>>>>>   https://bugs.launchpad.net/qemu/+bug/1002121
>>>>>>>>   -- Should be a regression on qemu-kvm.
>>>>>>>>
>>>>>>>
>>>>>>> Kevin, is this the known regression in qcow2 or something new?
>>>>>>
>>>>>> If the commit ID is right, it must be something new. The regression
>> that
>>>>>> Marcelo found was fixed in 54e68143.
>>>>>>
>>>>> Yes, it's right. This should be a new regression.
>>>>> I looked at the comment of 54e68143, and found it was not related
>> the
>>>> issue I reported.
>>>>>
>>>>>> The Launchpad bug refers to commit e54f008ef, which doesn't
>> include
>>>> this
>>>>>> fix indeed. So was the test repeated with a more current qemu-kvm
>>>>>> version after filing the bug in Launchpad, or is the commit ID in this
>>>>>> mail wrong?
>>>>>>
>>>>> Latest commit 3fd9fedb in qemu-kvm master tree still has this issue.
>>>>> And, the commit ID provided in Launchpad is correct.
>>>>
>>>> Can you please check if the bug exists in upstream qemu.git as well?
>>>>
>>> This bug doesn't exist on upstream qemu.git with latest commit:
>> fd4567d9.
>>> So, it should only exists on qemu-kvm tree.
>>
>> Please bisect manually (not using git bisect), with the attached list of
>> commits. These are the qemu -> qemu-kvm merge commits in the range
>> described as bad/good.
>>
> The 1st bad commit in your attached list is abc551bd
> More detailed info:
> 171d2f2249a360d7d623130d3aa991418c53716d       good
> fd453a24166e36a3d376c9bc221e520e3ee425af        good
> abc551bd456cf0407fa798395d83dc5aa35f6dbb         bad
> 823ccf41509baa197dd6a3bef63837a6cf101ad8         bad

That's strange. There are no obvious block-related diffs between, e.g.,
upstream a75bfc5fdda8b87ff969d68e020ffdf1008751b1 and qemu-kvm's
abc551bd456cf0407fa798395d83dc5aa35f6dbb merge.

Does the issue also show up with -no-kvm-irqchip in qemu-kvm or with
-machine accel=kvm,kernel_irqchip=on in upstream or with qemu-kvm's
uq/master branch? I suspect some actually unrelated difference in
qemu-kvm causes an upstream bug to become visible.

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux