Bug 2072379
| Summary: | Fail to rebuild the reference count tables of qcow2 image on host block devices (e.g. LVs) | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 9 | Reporter: | Tingting Mao <timao> |
| Component: | qemu-kvm | Assignee: | Hanna Czenczek <hreitz> |
| qemu-kvm sub component: | qcow2 | QA Contact: | Tingting Mao <timao> |
| Status: | CLOSED ERRATA | Docs Contact: | |
| Severity: | high | ||
| Priority: | urgent | CC: | areis, chayang, coli, gveitmic, hreitz, jinzhao, juzhang, kanderso, knoel, kwolf, mtessun, ngu, nsoffer, qzhang, rbalakri, timao, vcojot, virt-maint, xuwei, xzhou, zixchen |
| Version: | 9.0 | Keywords: | Reopened, Triaged, ZStream |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-7.0.0-6.el9 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | 1519071 | Environment: | |
| Last Closed: | 2022-11-15 09:54:42 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1519071 | ||
| Bug Blocks: | 2072242 | ||
|
Description
Tingting Mao
2022-04-06 07:54:09 UTC
QE bot(pre verify): Set 'Verified:Tested,SanityOnly' as gating/tier1 test pass. Verified this bug as below.
Tested with:
qemu-kvm-7.0.0-6.el9
kernel-5.14.0-96.el9.x86_64
Steps:
1. Prepare a LV as below
# qemu-img create -f raw loop.img 50G
# losetup /dev/loop1 /home/timao/test/loop.img
# pvcreate /dev/loop1
# vgroup vgroup /dev/loop1
# lvcreate -L 30G -n lv vgroup
2. Convert a installed well qcow2 to the lv above
# qemu-img check -r all RHEL-8.6-x86_64-latest.qcow2
No errors were found on the image.
30848/163840 = 18.83% allocated, 91.29% fragmented, 89.69% compressed clusters
Image end offset: 985595904
# qemu-img convert -f qcow2 -O qcow2 -o lazy_refcounts=on,compat=1.1 RHEL-8.6-x86_64-latest.qcow2 /dev/vgroup/lv -p
# qemu-img info /dev/vgroup/lv
image: /dev/vgroup/lv
file format: qcow2
virtual size: 10 GiB (10737418240 bytes)
disk size: 0 B
cluster_size: 65536
Format specific information:
compat: 1.1
compression type: zlib
lazy refcounts: true
refcount bits: 16
corrupt: false
extended l2: false
3. Boot up a guest from the lv
# /usr/libexec/qemu-kvm \
-S \
-name 'avocado-vt-vm1' \
-sandbox on \
-machine q35 \
-device pcie-root-port,id=pcie-root-port-0,multifunction=on,bus=pcie.0,addr=0x1,chassis=1 \
-device pcie-pci-bridge,id=pcie-pci-bridge-0,addr=0x0,bus=pcie-root-port-0 \
-nodefaults \
-device VGA,bus=pcie.0,addr=0x2 \
-m 15360 \
-smp 16,maxcpus=16,cores=8,threads=1,dies=1,sockets=2 \
-cpu 'Haswell-noTSX',+kvm_pv_unhalt \
-device pcie-root-port,id=pcie-root-port-1,port=0x1,addr=0x1.0x1,bus=pcie.0,chassis=2 \
-device qemu-xhci,id=usb1,bus=pcie-root-port-1,addr=0x0 \
-device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \
-object iothread,id=iothread0 \
-object iothread,id=iothread1 \
-device pcie-root-port,id=pcie-root-port-3,port=0x3,addr=0x1.0x3,bus=pcie.0,chassis=4 \
-device virtio-net-pci,mac=9a:1c:0c:0d:e3:4c,id=idjmZXQS,netdev=idEFQ4i1,bus=pcie-root-port-3,addr=0x0 \
-netdev tap,id=idEFQ4i1,vhost=on \
-vnc :0 \
-rtc base=utc,clock=host,driftfix=slew \
-boot menu=off,order=cdn,once=c,strict=off \
-enable-kvm \
-monitor stdio \
-device pcie-root-port,id=pcie-root-port-5,port=0x6,addr=0x1.0x5,bus=pcie.0,chassis=5 \
-device virtio-scsi-pci,id=virtio_scsi_pci2,bus=pcie-root-port-5,addr=0x0 \
-blockdev node-name=file_image1,driver=host_device,auto-read-only=on,discard=unmap,aio=threads,filename=/dev/vgroup/lv,cache.direct=on,cache.no-flush=off \
-blockdev node-name=drive_image1,driver=qcow2,read-only=off,cache.direct=off,cache.no-flush=off,file=file_image1 \
-device scsi-hd,id=image1,drive=drive_image1,write-cache=off \
-chardev socket,server=on,path=/var/tmp/monitor-qmpmonitor1-20210721-024113-AsZ7KYro,id=qmp_id_qmpmonitor1,wait=off \
-mon chardev=qmp_id_qmpmonitor1,mode=control \
4. dd file and get md5 value inside guest with sync
(guest)# dd if=/dev/urandom of=file1 conv=fsync bs=1M count=512 ; md5sum file1 ; sync
5. Kill qemu-kvm process in host immediately after the dd finished in last step.
# kill -9 `pidof qemu-kvm`
6. Check the lv image file
# qemu-img check -r all /dev/vgroup/lv
......
......
ERROR cluster 48276 refcount=0 reference=1
ERROR cluster 48277 refcount=0 reference=1
Rebuilding refcount structure
Repairing cluster 1 refcount=1 reference=0
Repairing cluster 2 refcount=1 reference=0
Repairing cluster 32774 refcount=1 reference=0
The following inconsistencies were found and repaired:
0 leaked clusters
7039 corruptions
Double checking the fixed image now...
No errors were found on the image.
48260/163840 = 29.46% allocated, 2.25% fragmented, 0.00% compressed clusters
Image end offset: 3164143616
Results:
As above, 'check -r all' fixed the image.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Moderate: qemu-kvm security, bug fix, and enhancement update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2022:7967 |