Libguestfs - Jun 2015 - Re: Issue with virt-builder on Ubuntu 14.04

- I tried forcing TCG and it gets to the same spot and stops.

- running make quickcheck passes the tests (see attached)

- I tried a different kernel (3.13.0-49-generic) and again it passes the
quickcheck but virt-builder hangs.

- I added 'set -x' to the top of the init script and I don't see any
additional output (see attached)

Shawn

On Tue, Jun 30, 2015 at 2:06 AM, Richard W.M. Jones <rjones@redhat.com>
wrote:
> On Mon, Jun 29, 2015 at 08:49:26PM -0600, Shawn Greig wrote:
> [...]
>
> Thanks for the detailed bug report.
>
> The issue is indeed something strange with your host or KVM or your
> host kernel (3.13.0-55-generic).  As you can see from the end of the
> messages:
>
> > [    0.371018] EXT4-fs (sdb): mounting ext2 file system using the ext4
> subsystem
> > [    0.393840] EXT4-fs (sdb): mounted filesystem without journal.
Opts:
> > supermin: chroot
> > Starting /init script ...
> > ln: failed to create symbolic link '/etc/mtab': File exists
> > /init: 55: /init: systemd-tmpfiles: not found
> > [    1.687079] systemd-udevd[91]: starting version 204
> > [    1.808148] random: nonblocking pool is initialized
> > [    1.886029] ACPI Exception: AE_BAD_PARAMETER, Thread 487102464
could
> not acquire Mutex [0x1] (20131115/utmutex-285)
> > [    1.886591] piix4_smbus 0000:00:01.3: SMBus Host Controller at
> 0xb100, revision 0
> > /init: 79: /init: cannot create
/sys/block/{h,s,ub,v}d*/queue/scheduler:
> Directory nonexistent
> > /sbin/dhclient-script: line 31: /etc/fstab: No such file or directory
> > [    2.935872] input: ImExPS/2 Generic Explorer Mouse as
> /devices/platform/i8042/serio1/input/input3
>
> ... the kernel boots quite far, and then hangs in the init script (see
> appliance/init).
>
> Some things you can try:
>
>  - Force qemu to use TCG (no KVM) mode to see if that makes a difference:
>
>    export LIBGUESTFS_BACKEND_SETTINGS=force_tcg
>
>  - Use 'libguestfs-test-tool' for testing to see if that makes a
>    difference.  In the build directory, run:
>
>    make quickcheck
>
>  - Try a different appliance kernel by setting these variables, but
>    choose different kernel versions by looking in your /boot directory
>    first:
>
>    export SUPERMIN_KERNEL_VERSION=3.13.0-55-generic
>    export SUPERMIN_KERNEL=/boot/vmlinuz-$SUPERMIN_KERNEL_VERSION
>    export SUPERMIN_MODULES=/lib/modules/$SUPERMIN_KERNEL_VERSION
>    rm -rf tmp/.guestfs-*
>    make quickcheck
>
>  - Add debugging 'set -x' to the top of appliance/init in the
source
>    tree to see if it fails while running a specific command.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-top is 'top' for virtual machines.  Tiny program with many
> powerful monitoring features, net stats, disk stats, logging, etc.
> http://people.redhat.com/~rjones/virt-top
>

On Tue, Jun 30, 2015 at 09:07:25AM -0600, Shawn Greig
wrote:
> - I tried forcing TCG and it gets to the same spot and stops.
That excludes the possibility that it's a KVM or kernel bug
(probably).
> - running make quickcheck passes the tests (see attached)
> 
> - I tried a different kernel (3.13.0-49-generic) and again it passes the
> quickcheck but virt-builder hangs.
Add 'virt-builder -v -x' flags and see where it's hanging.
> - I added 'set -x' to the top of the init script and I don't
see any
> additional output (see attached)
Somehow this didn't have any effect.  You probably didn't do a
'make'
before the 'make quickcheck'.  It would still be useful to see the
'set -x' output to see if a particular command is hanging.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/

Rich you're right, I forgot to run make. I added 'set -x' and reran
make
and then ran 'virt-builder -v -x' and it seems to hang at dhclient (see
attached log).

Shawn

On Tue, Jun 30, 2015 at 9:17 AM, Richard W.M. Jones <rjones@redhat.com>
wrote:
> On Tue, Jun 30, 2015 at 09:07:25AM -0600, Shawn Greig wrote:
> > - I tried forcing TCG and it gets to the same spot and stops.
>
> That excludes the possibility that it's a KVM or kernel bug
> (probably).
>
> > - running make quickcheck passes the tests (see attached)
> >
> > - I tried a different kernel (3.13.0-49-generic) and again it passes
the
> > quickcheck but virt-builder hangs.
>
> Add 'virt-builder -v -x' flags and see where it's hanging.
>
> > - I added 'set -x' to the top of the init script and I
don't see any
> > additional output (see attached)
>
> Somehow this didn't have any effect.  You probably didn't do a
'make'
> before the 'make quickcheck'.  It would still be useful to see the
> 'set -x' output to see if a particular command is hanging.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-df lists disk usage of guests without needing to install any
> software inside the virtual machine.  Supports Linux and Windows.
> http://people.redhat.com/~rjones/virt-df/
>