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 <mre...@redhat.com> > 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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