Re: [Qemu-devel] qcow2, lazy_refcounts and killing qemu

[Stefan Hajnoczi]

On Fri, Sep 05, 2014 at 06:41:37PM +0100, Richard W.M. Jones wrote:
> On Fri, Sep 05, 2014 at 04:39:51PM +0100, Stefan Hajnoczi wrote:
> > Did you try older QEMU versions?  I'm curious if this is something that
> > crept in later or is fundamentally broken in lazy_refcounts=on.
> 
> At your prompting, I've done a bit more investigation.
> 
> I was basing my observations on qemu 2.1.0.  However I tried my test
> against qemu from git today and the bug has gone.  Good!
> 
> For my entertainment, I bisected the problem, and the commit which
> *fixes* it is:
> 
>   commit 91af7014125895cc74141be6b60f3a3e882ed743
>   Author: Max Reitz <address@hidden>
>   Date:   Fri Jul 18 20:24:56 2014 +0200
> 
>     block: Add bdrv_refresh_filename()
> 
> I didn't believe this either, but I have checked the result manually
> and I'm pretty sure that whatever this commit does, it does end up
> fixing the lazy_refcounts problem as a side-effect.

Thanks!

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