Re: VM images for 12.0-CURRENT showing checksum failed messages

On Wed, Oct 18, 2017 at 09:28:40AM -0700, John Baldwin wrote:
> On Wednesday, October 18, 2017 03:01:55 PM Glen Barber wrote:
> > On Wed, Oct 18, 2017 at 07:49:00AM -0700, John Baldwin wrote:
> > > On Tuesday, October 17, 2017 11:57:44 AM David Boyd wrote:
> > > > The FreeBSD-12.0-CURRENT-amd64-20171012-r324542.vmdk image displays
> > > > many checksum failed messages when booted. (see attachment).
> > > > 
> > > > I think this started about 20170925.
> > > > 
> > > > I have VirtualBox VM's running 10.4-STABLE, 11.1-STABLE and 12.0-
> > > > CURRENT.
> > > > 
> > > > Only the 12.0-CURRENT image exhibits this behavior.
> > > > 
> > > > This is easily fixed by "fsck -y /" in single-user mode during the boot
> > > > process.
> > > > 
> > > > I can test any updates at almost any time.
> > > 
> > > I wonder if the tool creating the snapshot images wasn't updated to generate
> > > cg checksums when creating the initial filesystem.  Glen, do you know which
> > > tool (makefs or something else?) is used to generate the UFS filesystem
> > > in VM images for snapshots?  (In this case it appears to be a .vmdk image)
> > > 
> > 
> > mkimg(1) is used.
> 
> Does makefs generate the UFS image fed into mkimg or does mkimg generate the
> UFS partition itself?
> 

Sorry, I may have understated a bit.

First, mdconfig(8) is used to create a md(4)-backed disk, onto which
newfs(8) is run, followed by the installworld/installkernel targets.

Next, mkimg(1) is used to feed the resultant md(4)-based <format>.img
filesystem (after umount(8)) to create the final output image.

Glen