Yep. I can look at it in a few days. I'm assuming that the vm was stopped before running the check?
On April 18, 2022 3:42:50 PM EDT, Mike Larkin <mlar...@nested.page> wrote: >On Mon, Apr 18, 2022 at 12:21:39PM -0400, Dave Voutila wrote: >> >> "Thomas L." <tom.longsh...@web.de> writes: >> >> > Hi, >> > >> > I recently tried to use qemu-img with qcow2 images of my VMs and >> > qemu-img finds them corrupted. I can reproduce the issue in the >> > following way (on -current, but is the same on -stable; tried different >> > hosts to exclude hardware errors): >> > >> > marsden# vmctl create -s 300G test.qcow2 >> > vmctl: qcow2 imagefile created >> > marsden# qemu-img check test.qcow2 >> > No errors were found on the image. >> > Image end offset: 262144 >> > marsden# vmctl start -cL -B net -b /bsd.rd -d test.qcow2 test >> <snipped out the install log> >> > marsden# qemu-img check test.qcow2 >> > ERROR cluster 32769 refcount=0 reference=1 >> > >> > 1 errors were found on the image. >> > Data may be corrupted, or further writes to the image may corrupt it. >> > 39422/4915200 = 0.80% allocated, 3.31% fragmented, 0.00% compressed >> > clusters >> > Image end offset: 2610888704 >> >> I've been able to reproduce the above, but interestingly if I "repair" >> the qcow2 image using: >> >> $ qemu-img -r all test.qcow2 >> >> It then reports 0 errors. Booting up the vm and installing packages like >> python3 and git and then cloning some git repos to work the disk, it >> still reports 0 errors. >> >> Interestingly, if I install something like an Alpine 3.13 guest (just an >> iso I had handy), qemu-img reports 0 errors. >> >> I also looked at a handful of qcow2 images on one of my workstations and >> seems only an Alpine and NixOS guest do not have this "corruption" >> report. However, I've never experienced any noticeable abnormalities. >> >> Since I see this from non-OpenBSD guests (Debian, for instance) it >> doesn't seem to be our vioblk(4) driver and is probably vmd(8)'s qcow2 >> implementation.. >> >> Anyone familiar enough with qcow2 that might make heads or tails of >> this? (cc'd ori@ as he was the original implementer.) >> >> -dv >> > >Yeah, Ori would be the right person to answer. If not I can take a look if I >find the time. > -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
