Bug 736231

Summary:	Loading internal snapshot causing image corrupted
Product:	Red Hat Enterprise Linux 6	Reporter:	Qunfang Zhang <qzhang>
Component:	qemu-kvm	Assignee:	Kevin Wolf <kwolf>
Status:	CLOSED WORKSFORME	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	low
Version:	6.2	CC:	areis, flang, juzhang, michen, mkenneth, shuang, tburke, virt-maint
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-05-17 15:39:07 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Qunfang Zhang 2011-09-07 06:13:01 UTC

Description of problem:
Boot a guest and save a internal snapshot, and then loading the snapshot. The guest image got corrupted.

# qemu-img check RHEL6.2-64.qcow2 

ERROR OFLAG_COPIED: offset=80000001998d0000 refcount=2
ERROR OFLAG_COPIED: offset=80000001998e0000 refcount=2
ERROR OFLAG_COPIED: offset=80000001998f0000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199900000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199910000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199920000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199930000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199940000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199950000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199960000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199970000 refcount=2
ERROR OFLAG_COPIED: offset=8000000199980000 refcount=2
..........

Test with the steps in bug 729572, no error. File this bug as the error messages are different as bug 729572.

Version-Release number of selected component (if applicable):
kernel-2.6.32-195.el6.x86_64
qemu-kvm-0.12.1.2-2.185.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
1.Boot a qcow2 image.

/usr/libexec/qemu-kvm -M rhel6.1.0 -cpu cpu64-rhel6,+x2apic -enable-kvm -m 4096 -smp 1 -name RHEL6.2-64 -uuid 075527b4-a514-4c58-aad3-84edfe54bb84 -monitor stdio -rtc base=localtime -boot c -device virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pci.0,addr=0x3 -drive file=/home/RHEL6.2-64.qcow2,if=none,id=virtio-drive-0,format=qcow2,cache=none,werror=stop,rerror=stop -device ide-drive,bus=ide.0,drive=virtio-drive-0,id=virtio0 -netdev tap,id=hostnet0,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:1a:4a:16:28:12,bus=pci.0,addr=0x5 -chardev socket,id=charchannel0,path=/tmp/foo,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.rhevm.vdsm -chardev spicevmc,id=charchannel1,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat.spice.0 -usb -spice port=5930,disable-ticketing -k en-us -vga qxl -global qxl-vga.vram_size=67108864 -device virtio-balloon-pci,bus=pci.0,id=balloon0

2.(qemu) info snapshots 
(qemu) savevm sn1

3.After step 2 finished, load sn1.
(qemu) loadvm sn1

  
Actual results:
Guest image got corrupted, please check the error message in bug description.

Expected results:
No corruption for guest image.

Additional info:
Test on qemu-kvm-0.12.1.2-2.178.el6.x86_64, this issue exists as well.

Comment 4 Suqin Huang 2012-07-30 02:30:41 UTC

Hi kevin,
Can we close this bug, seems internal snapshot is not supported.

Suqin

Comment 5 Kevin Wolf 2012-07-30 07:41:17 UTC

Let's leave it open with low priority.

Comment 7 Kevin Wolf 2013-04-17 14:13:33 UTC

I tried to reproduce this, but I can neither on current RHEL 6, nor in the -185
build. Is this really 100% reproducible for you?

Comment 8 Ademar Reis 2013-05-17 15:39:07 UTC

Internal snapshot is not supported and Kevin couldn't reproduce it. So I'm closing it.