[Libguestfs] virt-sparsify error message.

[Pino Toscano]

Hi,

On Thursday, 26 December 2019 11:27:46 CET gilles2.lebris at laposte.net wrote:
> I'm using virt-sparsify on a new server and I get an error message: 
> 
> # virt-sparsify img img2 
> [   0.0] Create overlay file in /tmp to protect source disk 
> [   0.1] Examine source disk 
> virt-sparsify: error: libguestfs error: guestfs_launch failed. 
> This usually means the libguestfs appliance failed to start or crashed. 
> 
> Here is libguestfs-test-tool output:
> http://pastebin.com/3EZNxAeR

The extract of the failure is:

[...]
supermin: waiting another 1024000000 ns for /sys/block/sdb/dev to appear
This usually means your kernel doesn't support virtio, or supermin was unable
to load some kernel modules (see module loading messages above).
supermin: waiting another 2048000000 ns for /sys/block/sdb/dev to appear
supermin: waiting another 4096000000 ns for /sys/block/sdb/dev to appear
supermin: waiting another 8192000000 ns for /sys/block/sdb/dev to appear
supermin: waiting another 16384000000 ns for /sys/block/sdb/dev to appear
supermin: waiting another 32768000000 ns for /sys/block/sdb/dev to appear
supermin: waiting another 65536000000 ns for /sys/block/sdb/dev to appear
supermin: waiting another 131072000000 ns for /sys/block/sdb/dev to appear
supermin: waiting another 262144000000 ns for /sys/block/sdb/dev to appear
supermin: creating /dev/root as block special 1:0
supermin: mounting new root on /root
[  525.350726] EXT2-fs (ram0): error: can't find an ext2 filesystem on dev ram0.

Your system seems to be RHEL/CentOS 7.7, however there is a different
kernel installed:

\x1b[2J[    0.000000] Linux version 4.19-ovh-xxxx-std-ipv6-64 (kernel at kernel.ovh.net) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1)) #1038749 SMP Mon Dec 23 08:31:48 UTC 2019

It sounds like that kernel is broken, and it does not have virtio
modules. Please report that to whoever supplied that kernel.

If there is the stock RHEL/CentOS kernel available in /boot, you can
explicitly use it:
- wipe /var/tmp/.guestfs-0
- export the SUPERMIN_KERNEL environment variable to the full path of
  the RHEL/CentOS kernel, e.g.
  # export SUPERMIN_KERNEL=/boot/vmlinuz-etc...
  (see the supermin(1) man page for more details)
- try running libguestfs-test-tool again

-- 
Pino Toscano
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