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Re: [Libguestfs] virt-sysprep: error: no operating systems were found in the guest image on libguestfs-1.36.5



On Wed, Aug 23, 2017 at 06:25:17AM +0000, Tang, Alan (NSB - CN/Qingdao) wrote:
> [    0.000000] Linux version 3.10.101 (root ci092133) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Mon Apr 11 16:22:43 ULAT 2016

...

> commandrvf: mount -o ro /dev/sda1 /sysroot/
> [    2.333550] SGI XFS with ACLs, security attributes, large block/inode numbers, no debug enabled
> [    2.339803] XFS (sda1): Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled!
> [    2.339803] Use of these features in this kernel is at your own risk!
> [    2.342254] XFS (sda1): Superblock has unknown incompatible features (0x1) enabled.
> [    2.342254] Filesystem can not be safely mounted by this kernel.
> [    2.344366] ffff88001c25a000: 58 46 53 42 00 00 10 00 00 00 00 00 00 1f ff 00  XFSB............
> [    2.345719] ffff88001c25a010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> [    2.347074] ffff88001c25a020: e3 51 03 f0 80 28 40 84 b7 5a 98 69 a8 46 b6 46  .Q...(@..Z.i.F.F
> [    2.348416] ffff88001c25a030: 00 00 00 00 00 10 00 04 00 00 00 00 00 00 00 40  ...............@
> [    2.349765] XFS (sda1): Internal error xfs_sb_read_verify at line 730 of file fs/xfs/xfs_mount.c.  Caller 0xffffffffa01faf35

The problem is that the XFS module in this old kernel does not know
how to read new features in the XFS filesystem from the CentOS 7
kernel (and instead of giving a useful error, panics).

Unfortunately in general it's not possible to read an XFS filesystem
from a newer machine with an older kernel.  You will have to upgrade
the host to a new version, or install or use a newer kernel by setting
various environment variables:

  http://libguestfs.org/guestfs-faq.1.html#broken-kernel-or-trying-a-different-kernel

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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