1028276 – Should improve error info when can't find backing file for snapshot

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 1028276 - Should improve error info when can't find backing file for snapshot

Summary: Should improve error info when can't find backing file for snapshot

Keywords:
Status:	CLOSED WONTFIX
Alias:	None
Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	qemu-kvm
Sub Component:
Version:	6.5
Hardware:	Unspecified
OS:	Unspecified
Priority:	low
Severity:	low
Target Milestone:	rc
Target Release:	---
Assignee:	Jeff Cody
QA Contact:	Virtualization Bugs
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:	1084302 1161582
TreeView+	depends on / blocked

Reported:	2013-11-08 05:17 UTC by langfang
Modified:	2014-11-07 11:47 UTC (History)
CC List:	9 users (show)
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Clone Of:
Clones:	1084302 (view as bug list)
Environment:
Last Closed:	2014-06-11 18:01:07 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Description langfang 2013-11-08 05:17:10 UTC

Description of problem:

Should improve error info when can't find backing file for snapshot.

Version-Release number of selected component (if applicable):

Host A:rhel6.4.z
# uname -r
2.6.32-358.27.1.el6.x86_64
# rpm -q qemu-kvm-rhev
qemu-kvm-rhev-0.12.1.2-2.355.el6_4.9.x86_64

Host B:rhel6.5
# uname -r
2.6.32-429.el6.x86_64
# rpm -q qemu-kvm-rhev
qemu-kvm-rhev-0.12.1.2-2.415.el6.x86_64

Guest:
2.6.32-428.el6.i686


How reproducible:

100%

Preparation:NFS

HostA:
#vi /etc/exports 
/home *(rw,no_root_squash)

#service nfs start
#mount -o soft,timeo=600,retrans=2,nosharecache 10.66.84.13:/home/ /mnt

HostB:

#mount -o soft,timeo=600,retrans=2,nosharecache 10.66.84.13:/home/ /mnt


Steps to Reproduce:

1.Boot guest on hostA

2.Create snapshot chains, 
 Base image -> snapshot A -> snapshot B -> snapshot C 

3.On hostA
#cd /mnt
#ll
-rw-r--r--. 1 root root 21474836480 Nov  8 13:06 rhel6-instal6.4-zhost.raw
-rw-r--r--. 1 root root    26083328 Nov  7 17:15 snapshotA
-rw-r--r--. 1 root root    25821184 Nov  7 17:15 snapshotB
-rw-r--r--. 1 root root    28114944 Nov  7 17:57 snapshotC

# qemu-img info snapshotC
image: snapshotC.back
file format: qcow2
virtual size: 20G (21474836480 bytes)
disk size: 27M
cluster_size: 65536
backing file: /home/snapshotB

3.Shutdown guest on HostA,then boot snapshotC on  HostB

... -drive file=/mnt/snapshotC,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=qcow2 -device ide-drive,bus=ide.1,unit=1,drive=drive-ide0-1-0,id=ide0-1-0 
...


Actual results:
Error info:
qemu-kvm: -drive file=/mnt/snapshotC,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=qcow2: could not open disk image /mnt/snapshotC: No such file or directory


Expected results:

Should give the error info about can't find the backing file.

EG:
qemu-kvm:-drive file=/mnt/snapshotC,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=qcow2:could not find the backing file /home/snapshotB.


Additional info:


My CLI:
HOSTB:
 /usr/libexec/qemu-kvm -cpu Opteron_G3 -M rhel6.4.0 -enable-kvm -m 4096 -smp 2,cores=1,threads=1 -name RHEL6.5 -uuid `uuidgen` -nodefconfig -nodefaults -monitor stdio -rtc base=utc -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x7 -device virtio-scsi-pci,bus=pci.0,addr=0x5,id=scsi0 -drive file=/mnt/snapshotC,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=qcow2 -device ide-drive,bus=ide.1,unit=1,drive=drive-ide0-1-0,id=ide0-1-0 -device usb-tablet,id=input0 -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -netdev tap,id=hostnet2,fd=20 -device virtio-net-pci,__com_redhat_macvtap_compat=on,netdev=hostnet2,id=net0,mac=00:10:20:2d:31:21,addr=0x8 20<>/dev/tap4 -vnc :10 -vga qxl -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -boot menu=on

Comment 2 langfang 2013-11-08 05:27:10 UTC

Correction:

MY CLI:Host B
 /usr/libexec/qemu-kvm -cpu Opteron_G3 -M rhel6.4.0 -enable-kvm -m 4096 -smp 2,cores=1,threads=1 -name RHEL6.5 -uuid `uuidgen` -nodefconfig -nodefaults -monitor stdio -rtc base=utc -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x7 -device virtio-scsi-pci,bus=pci.0,addr=0x5,id=scsi0 -drive file=/mnt/snapshotC,if=none,id=drive-scsi0-0-0,media=disk,cache=none,format=qcow2,werror=stop,rerror=stop,aio=native -device scsi-hd,drive=drive-scsi0-0-0,bus=scsi0.0,scsi-id=0,id=sluo -drive file=/mnt/RHEL6.5-20131031.1-Server-i386-DVD1.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=1,drive=drive-ide0-1-0,id=ide0-1-0 -device usb-tablet,id=input0 -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -netdev tap,id=hostnet2,fd=20 -device virtio-net-pci,__com_redhat_macvtap_compat=on,netdev=hostnet2,id=net0,mac=00:10:20:2d:31:21,addr=0x8 20<>/dev/tap4 -vnc :10 -vga qxl -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -boot menu=on

Comment 3 RHEL Program Management 2013-11-11 06:05:46 UTC

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Note You need to log in before you can comment on or make changes to this bug.