[Qemu-devel] qcow2 images going corrupt

[Qemu-devel] qcow2 images going corrupt

[Csaba Henk]

Hi,

I'm running qemu 0.9.0 on a Linux host.

I'm using a qcow2 image. I run qemu in daemon mode. When I'm to finish my
session with the guest, I go to the monitor, do a "savevm whatever",
"commit all", "q".

What I see that the image becomes corrupt very often (qemu-img sees it
as a raw image). (I do the "commit all" only because I suffer and I don't
have any better idea in mind -- I guess it shouldn't have an effect on
the correctness of disk handling).

Any idea what's wrong? Or a fault-proof way of leaving qemu?

I can upload an example corrupt image if someone would like to analyze
it. 1.6G gzipped.

Csaba

Re: [Qemu-devel] qcow2 images going corrupt

[Thiemo Seufer]

Csaba Henk wrote:
> Hi,
> 
> I'm running qemu 0.9.0 on a Linux host.
> 
> I'm using a qcow2 image. I run qemu in daemon mode. When I'm to finish my
> session with the guest, I go to the monitor, do a "savevm whatever",
> "commit all", "q".
> 
> What I see that the image becomes corrupt very often (qemu-img sees it
> as a raw image). (I do the "commit all" only because I suffer and I don't
> have any better idea in mind -- I guess it shouldn't have an effect on
> the correctness of disk handling).
> 
> Any idea what's wrong? Or a fault-proof way of leaving qemu?

There was a bug in the qcow2 support which is fixed in CVS. You can use
qcow instead, or upgrade to a recent-ish CVS version of qemu.


Thiemo

[Qemu-devel] Re: qcow2 images going corrupt

[Csaba Henk]

On 2007-05-08, Thiemo Seufer <ths@networkno.de> wrote:
> There was a bug in the qcow2 support which is fixed in CVS. You can use
> qcow instead, or upgrade to a recent-ish CVS version of qemu.

Oh yeah, thanks, I see. I really could as well have looked it up
myself...

What I *don't* understand is that why has not the Qemu team made a
bugfix release immediately? This is a _serious bug_. It can cause data
loss. As it did for me.

Csaba

Re: [Qemu-devel] Re: qcow2 images going corrupt

[C.W. Betts]

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Maybe release Qemu 0.9.01 with only the qcow2 image fixed
On Wednesday, May 9, 2007, at 06:47  AM, Csaba Henk wrote:

> On 2007-05-08, Thiemo Seufer <ths@networkno.de> wrote:
>> There was a bug in the qcow2 support which is fixed in CVS. You can 
>> use
>> qcow instead, or upgrade to a recent-ish CVS version of qemu.
>
> Oh yeah, thanks, I see. I really could as well have looked it up
> myself...
>
> What I *don't* understand is that why has not the Qemu team made a
> bugfix release immediately? This is a _serious bug_. It can cause data
> loss. As it did for me.
>
> Csaba
>
>
>

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