"Richard W.M. Jones" <rjo...@redhat.com> writes: > 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.
Weird. Maybe Max (cc'ed) has an idea. > ---------------------------------------------------------------------- > > I've updated the test script (attached), so you can now run it against > your own qemu, and also to improve the output.
