[Qemu-devel] My OS hangup in KVM for some reasons, how can I debug?

[Qemu-devel] My OS hangup in KVM for some reasons, how can I debug?

[Jun Koi]

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Hi,

I have an weird OS that I am trying to boot in KVM. however, it just hang
in the middle, without a good reason.

The same OS boots fine in physical machine, and this OS comes with no
source code.

There must be a bug somewhere in KVM, so I am wondering how people debug
deal with such a case to find and fix bugs in KVM?

Same thing like this happened before with some new OSes (such as Windows
8), and somebody always came up with a quick fix, so I am wondering what
the magic is here.

Thanks so much.
Jun

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Re: [Qemu-devel] My OS hangup in KVM for some reasons, how can I debug?

[Jun Koi]

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On Thu, May 8, 2014 at 4:28 PM, Jun Koi <junkoi2004@gmail.com> wrote:

> Hi,
>
> I have an weird OS that I am trying to boot in KVM. however, it just hang
> in the middle, without a good reason.
>
> The same OS boots fine in physical machine, and this OS comes with no
> source code.
>
> There must be a bug somewhere in KVM, so I am wondering how people debug
> deal with such a case to find and fix bugs in KVM?
>
> Same thing like this happened before with some new OSes (such as Windows
> 8), and somebody always came up with a quick fix, so I am wondering what
> the magic is here.
>
>
Any help, please?

thanks.
Jun

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Re: [Qemu-devel] My OS hangup in KVM for some reasons, how can I debug?

[Jun Koi]

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On Fri, May 9, 2014 at 11:24 AM, Jun Koi <junkoi2004@gmail.com> wrote:

>
>
>
> On Thu, May 8, 2014 at 4:28 PM, Jun Koi <junkoi2004@gmail.com> wrote:
>
>> Hi,
>>
>> I have an weird OS that I am trying to boot in KVM. however, it just hang
>> in the middle, without a good reason.
>>
>> The same OS boots fine in physical machine, and this OS comes with no
>> source code.
>>
>> There must be a bug somewhere in KVM, so I am wondering how people debug
>> deal with such a case to find and fix bugs in KVM?
>>
>> Same thing like this happened before with some new OSes (such as Windows
>> 8), and somebody always came up with a quick fix, so I am wondering what
>> the magic is here.
>>
>>
>
Any help, please?


Thanks,
Jun

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Re: [Qemu-devel] My OS hangup in KVM for some reasons, how can I debug?

[Fam Zheng]

On Thu, 05/08 16:28, Jun Koi wrote:
> Hi,
> 
> I have an weird OS that I am trying to boot in KVM. however, it just hang
> in the middle, without a good reason.
> 
> The same OS boots fine in physical machine, and this OS comes with no
> source code.

The OS boots in one physical machine doesn't mean it has no bug, and doesn't
mean it boots on ALL physical machines. So you really have to debug to tell if
it's a bug of KVM or the OS. But you have no source code, it makes the problem
really hard to work on then.

But if you can see any error message or debug output of the guest, or any
observation that may help to provide some information.

Fam

Re: [Qemu-devel] My OS hangup in KVM for some reasons, how can I debug?

[Thomas Huth]

On Sun, 11 May 2014 21:09:44 +0800
Jun Koi <junkoi2004@gmail.com> wrote:

> On Fri, May 9, 2014 at 11:24 AM, Jun Koi <junkoi2004@gmail.com> wrote:
> 
> >
> >
> >
> > On Thu, May 8, 2014 at 4:28 PM, Jun Koi <junkoi2004@gmail.com> wrote:
> >
> >> Hi,
> >>
> >> I have an weird OS that I am trying to boot in KVM. however, it just hang
> >> in the middle, without a good reason.
> >>
> >> The same OS boots fine in physical machine, and this OS comes with no
> >> source code.
> >>
> >> There must be a bug somewhere in KVM, so I am wondering how people debug
> >> deal with such a case to find and fix bugs in KVM?
> >>
> >> Same thing like this happened before with some new OSes (such as Windows
> >> 8), and somebody always came up with a quick fix, so I am wondering what
> >> the magic is here.
> >>
> >>
> >
> Any help, please?

You could try to attach a GDB to see where it is hanging (start qemu
with the -s option, see http://wiki.qemu.org/Documentation/Debugging).

 Thomas