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 2072242 - Fail to rebuild the reference count tables of qcow2 image on host block devices (e.g. LVs) [rhel-8.6.0.z]
Summary: Fail to rebuild the reference count tables of qcow2 image on host block devic...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: qemu-kvm
Version: 8.5
Hardware: All
OS: Linux
urgent
high
Target Milestone: rc
: ---
Assignee: Hanna Czenczek
QA Contact: Tingting Mao
URL:
Whiteboard:
Depends On: 1519071 2072379
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-04-05 21:44 UTC by RHEL Program Management Team
Modified: 2022-08-02 10:11 UTC (History)
21 users (show)

Fixed In Version: qemu-kvm-6.2.0-11.module+el8.6.0+15404+4d757596.1
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1519071
Environment:
Last Closed: 2022-08-02 10:01:20 UTC
Type: ---
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Gitlab redhat/rhel/src/qemu-kvm qemu-kvm merge_requests 173 0 None Waiting on Customer Stack can not be created, need to run update always after first failure - timeout error 2022-06-14 15:23:46 UTC
Red Hat Issue Tracker RHELPLAN-117982 0 None None None 2022-04-05 21:49:40 UTC
Red Hat Product Errata RHSA-2022:5821 0 None None None 2022-08-02 10:01:49 UTC

Comment 5 Yanan Fu 2022-05-26 05:21:32 UTC 
QE bot(pre verify): Set 'Verified:Tested,SanityOnly' as gating/tier1 test pass.
Comment 6 Tingting Mao 2022-05-30 06:44:42 UTC 
Verified this bug as below:


Tested with:
qemu-kvm-6.2.0-11.module+el8.6.0+15404+4d757596.1
kernel-4.18.0-372.10.1.el8_6.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
# vgcreate 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.
31054/163840 = 18.95% allocated, 92.09% fragmented, 90.65% compressed clusters
Image end offset: 966262784

# 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 40641 refcount=0 reference=1
ERROR cluster 40642 refcount=0 reference=1
ERROR cluster 40643 refcount=0 reference=1
ERROR cluster 40644 refcount=0 reference=1
ERROR cluster 40645 refcount=0 reference=1
Rebuilding refcount structure
Repairing cluster 40218 refcount=1 reference=0
Repairing cluster 40219 refcount=1 reference=0
Repairing cluster 40220 refcount=1 reference=0
The following inconsistencies were found and repaired:

    0 leaked clusters
    410 corruptions

Double checking the fixed image now...
No errors were found on the image.
40626/163840 = 24.80% allocated, 1.11% fragmented, 0.00% compressed clusters
Image end offset: 2663841792


Results:
As above, 'check -r all' fixed the image.
Comment 9 Tingting Mao 2022-05-31 03:23:23 UTC 
According to comment6, set this bug as verified.
Comment 18 errata-xmlrpc 2022-08-02 10:01:20 UTC 
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: virt:rhel and virt-devel:rhel 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-2022:5821
Note You need to log in before you can comment on or make changes to this bug.