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

[Nenad Cuturic]

What I could see the snapshot offset points somewhere in apache log file.
Related to the discovered bash vulnerability I was rebooting VM last week as 
well as prior to release upgrade (all VM's were shut down during the upgrade, 
though if I remember it well after the upgrade process and prior to reboot I 
discovered that 2 of VM's were restarted but not this particular one).
Anyhow here is the requested info:

header:

magic                     0x514649fb
version                   2
backing_file_offset       0x0
backing_file_size         0x0
cluster_bits              16
size                      1052771352576
crypt_method              0
l1_size                   1961
l1_table_offset           0x30000
refcount_table_offset     0x10000
refcount_table_clusters   1
nb_snapshots              1
snapshot_offset           0x66090000
incompatible_features     0x0
compatible_features       0x0
autoclear_features        0x0
refcount_order            4
header_length             72

hexdump -s 0x66090000 -n 2048 xyz.qcow2
66090000 3231 2e37 2e30 2e30 2031 202d 2d20 2020
66090010 305b 2f31 6553 2f70 3032 3331 313a 3a32
66090020 3833 303a 2036 302b 3030 5d30 2220 4f50
66090030 5453 2f20 6f73 726c 732f 6c65 6365 2074
66090040 5448 5054 312f 312e 2022 3032 2030 3336
66090050 3733 0a20 3231 2e37 2e30 2e30 2031 202d
66090060 2d20 2020 305b 2f31 6553 2f70 3032 3331
66090070 313a 3a32 3833 303a 2036 302b 3030 5d30
66090080 2220 4547 2054 732f 6c6f 2f72 6461 696d
66090090 2f6e 6966 656c 3f2f 6966 656c 733d 6863
660900a0 6d65 2e61 6d78 206c 5448 5054 312f 312e
660900b0 2022 3032 2030 3031 3931 2038 310a 3732
660900c0 302e 302e 312e 2d20 2020 202d 5b20 3130
660900d0 532f 7065 322f 3130 3a33 3231 333a 3a38
660900e0 3730 2b20 3030 3030 205d 5022 534f 2054
660900f0 732f 6c6f 2f72 6573 656c 7463 4820 5454
66090100 2f50 2e31 2231 3220 3030 3120 3632 3637
66090110 0a20 3231 2e37 2e30 2e30 2031 202d 2d20
66090120 2020 305b 2f31 6553 2f70 3032 3331 313a
66090130 3a32 3833 303a 2037 302b 3030 5d30 2220
66090140 4f50 5453 2f20 6f73 726c 732f 6c65 6365
66090150 2074 5448 5054 312f 312e 2022 3032 2030
66090160 3534 2037 310a 3732 302e 302e 312e 2d20
66090170 2020 202d 5b20 3130 532f 7065 322f 3130
66090180 3a33 3231 333a 3a38 3730 2b20 3030 3030
66090190 205d 5022 534f 2054 732f 6c6f 2f72 6573
660901a0 656c 7463 4820 5454 2f50 2e31 2231 3220
660901b0 3030 3320 3738 0a20 3231 2e37 2e30 2e30
660901c0 2031 202d 2d20 2020 305b 2f31 6553 2f70
660901d0 3032 3331 313a 3a32 3833 303a 2037 302b
660901e0 3030 5d30 2220 4f50 5453 2f20 6f73 726c
660901f0 732f 6c65 6365 2074 5448 5054 312f 312e
66090200 2022 3032 2030 3534 2037 310a 3732 302e
66090210 302e 312e 2d20 2020 202d 5b20 3130 532f
66090220 7065 322f 3130 3a33 3231 333a 3a38 3730
66090230 2b20 3030 3030 205d 5022 534f 2054 732f
66090240 6c6f 2f72 6573 656c 7463 4820 5454 2f50
66090250 2e31 2231 3220 3030 3320 3436 0a20 3231
66090260 2e37 2e30 2e30 2031 202d 2d20 2020 305b
66090270 2f31 6553 2f70 3032 3331 313a 3a32 3833
66090280 303a 2037 302b 3030 5d30 2220 4f50 5453
66090290 2f20 6f73 726c 732f 6c65 6365 2074 5448
660902a0 5054 312f 312e 2022 3032 2030 3534 2037
660902b0 310a 3732 302e 302e 312e 2d20 2020 202d
660902c0 5b20 3130 532f 7065 322f 3130 3a33 3231
660902d0 343a 3a32 3231 2b20 3030 3030 205d 5022
660902e0 534f 2054 732f 6c6f 2f72 6573 656c 7463
660902f0 4820 5454 2f50 2e31 2231 3220 3030 3620
66090300 3333 2037 310a 3732 302e 302e 312e 2d20
66090310 2020 202d 5b20 3130 532f 7065 322f 3130
66090320 3a33 3231 343a 3a32 3231 2b20 3030 3030
66090330 205d 4722 5445 2f20 6f73 726c 612f 6d64
66090340 6e69 662f 6c69 2f65 663f 6c69 3d65 6373
66090350 6568 616d 782e 6c6d 4820 5454 2f50 2e31
66090360 2231 3220 3030 3120 3130 3839 0a20 3231
66090370 2e37 2e30 2e30 2031 202d 2d20 2020 305b
66090380 2f31 6553 2f70 3032 3331 313a 3a35 3132
66090390 303a 2037 302b 3030 5d30 2220 4f50 5453
660903a0 2f20 6f73 726c 732f 6c65 6365 2074 5448
660903b0 5054 312f 312e 2022 3032 2030 3336 3733
660903c0 0a20 3231 2e37 2e30 2e30 2031 202d 2d20
660903d0 2020 305b 2f31 6553 2f70 3032 3331 313a
660903e0 3a35 3132 303a 2037 302b 3030 5d30 2220
660903f0 4547 2054 732f 6c6f 2f72 6461 696d 2f6e
66090400 6966 656c 3f2f 6966 656c 733d 6863 6d65
66090410 2e61 6d78 206c 5448 5054 312f 312e 2022
66090420 3032 2030 3031 3931 2038 310a 3732 302e
66090430 302e 312e 2d20 2020 202d 5b20 3130 532f
66090440 7065 322f 3130 3a33 3132 333a 3a38 3132
66090450 2b20 3030 3030 205d 5022 534f 2054 732f
66090460 6c6f 2f72 6573 656c 7463 4820 5454 2f50
66090470 2e31 2231 3220 3030 3620 3333 2037 310a
66090480 3732 302e 302e 312e 2d20 2020 202d 5b20
66090490 3130 532f 7065 322f 3130 3a33 3132 333a
660904a0 3a38 3132 2b20 3030 3030 205d 4722 5445
660904b0 2f20 6f73 726c 612f 6d64 6e69 662f 6c69
660904c0 2f65 663f 6c69 3d65 6373 6568 616d 782e
660904d0 6c6d 4820 5454 2f50 2e31 2231 3220 3030
660904e0 3120 3130 3839 0a20 0000 0000 0000 0000
660904f0 0000 0000 0000 0000 0000 0000 0000 0000
*
66090800

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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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