[Qemu-devel] [Bug 1354167] Re: On VM restart: Could not open 'poppy.qcow2': Could not read snapshots: File too large

[Rob Schultz]

I had the exact same issue with a VM after upgrading the host from 12.04
to 14.04.

Thank you Todd for the workaround. It would have been more work than I
cared for to reassemble that machine (even if it was just a test
machine).

I'm not sure what the status of this bug is? Is this something that is
already fixed but was an exisiting issue from a previous version?

I've attached the qemu-img I compiled. It may help someone else recover
a bit quicker - getting everything in place to compile the binary wasted
a good couple of hours as I had to modify several dependancies, install
additional packages, etc. But of course, the safer method is to build
yourself.

FWIW I had to install:
 sudo apt-get install autoconf automake autopoint autotools-dev dh-autoreconf 
libltdl-dev libtool m4 libglib2.0-0-dbg  libglib2.0-bin libglib2.0-dev 
libpcre3-dev libpcrecpp0

( I think I could have just done autoconf rather than dh-autoreconf)

After the installation of libglib2.0-0-dbg remember to re-run
./configure

If you compile yourself you can kill the make process after the build of
the qemu-img binary.



** Attachment added: "qemu-img version 1.7.2 compiled on Ubuntu Trusty Thar 
(Ubuntu 14.04.1 LTS)"
   
https://bugs.launchpad.net/qemu/+bug/1354167/+attachment/4229538/+files/qemu-img

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https://bugs.launchpad.net/bugs/1354167

Title:
  On VM restart: Could not open 'poppy.qcow2': Could not read snapshots:
  File too large

Status in QEMU:
  New

Bug description:
  I'm unable to restart a VM.   virt-manager is giving me:

  Error starting domain: internal error: process exited while connecting
  to monitor: qemu-system-x86_64: -drive
  file=/var/lib/libvirt/images/poppy.qcow2,if=none,id=drive-virtio-
  disk0,format=qcow2: could not open disk image
  /var/lib/libvirt/images/poppy.qcow2: Could not read snapshots: File
  too large

  
  From the command line trying to check the image also gives me:
  qemu-img check poppy.qcow2
  qemu-img: Could not open 'poppy.qcow2': Could not read snapshots: File too 
large

  
  This bug appears with both the default install of qemu for ubuntu 14.04:
  qemu-img version 2.0.0, Copyright (c) 2004-2008 Fabrice Bellard

  And the latest version.
  qemu-img version 2.1.50, Copyright (c) 2004-2008 Fabrice Bellard

  
  Host: 
  Dual E5-2650 v2 @ 2.60GHz
  32GB Memory
  4TB Disk space (2.1TB Free) 

  Host OS: Ubuntu 14.04.1 LTS 64bit

  Guest:
  Ubuntu 14.04 64bit
  Storage Size: 500gb

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