Your message dated Thu, 01 Jan 2026 10:17:07 +0000
with message-id <[email protected]>
and subject line Bug#1121280: fixed in libvirt 11.3.0-3+deb13u2
has caused the Debian Bug report #1121280,
regarding libvirt0: libvirt snapshot creation disables detect_zeroes
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1121280: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1121280
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: libvirt0
Version: 11.3.0-3+deb13u1
Severity: normal
Tags: upstream
X-Debbugs-Cc: [email protected]
During snapshot creation in libvirt with qemu/kvm, the function
qemuDomainPrepareDiskSourceData() is called to copy properties into the
new top image for the snapshot. The function only copies the detect_zeroes
property if the image is already the top image:
/* transfer properties valid only for the top level image */
if (src == disk->src || src == disk->src->dataFileStore)
src->detect_zeroes = disk->detect_zeroes;
The new image is about to be the top image, but it isn't yet at the time of
this function call, with the result that detect_zeroes remains as its default
(off) and creating a snapshot causes it to be disabled in the running VM:
# grep -A3 "device='disk'" trogdor.xml
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' discard='unmap' detect_zeroes='unmap'/>
<source file='/var/lib/libvirt/images/trogdor.qcow2'/>
<target dev='vda' bus='virtio'/>
# virsh define trogdor.xml
Domain 'trogdor' defined from trogdor.xml
# virsh start trogdor
Domain 'trogdor' started
# virsh qemu-monitor-command trogdor --pretty
'{"execute":"query-block"}'|grep detect_zeroes
"detect_zeroes": "unmap",
# virsh snapshot-create-as --domain trogdor snap42 --diskspec
vda,file=/var/lib/libvirt/images/trogdor-snap42.qcow2 --disk-only
Domain snapshot snap42 created
# virsh qemu-monitor-command trogdor --pretty
'{"execute":"query-block"}'|grep detect_zeroes
"detect_zeroes": "off",
-- System Information:
Debian Release: 13.2
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.12.57+deb13-amd64 (SMP w/4 CPU threads; PREEMPT)
Kernel taint flags: TAINT_FIRMWARE_WORKAROUND
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages libvirt0 depends on:
ii libacl1 2.3.2-2+b1
ii libapparmor1 4.1.0-1
ii libaudit1 1:4.0.2-2+b2
ii libbsd0 0.12.2-2
ii libc6 2.41-12
ii libcap-ng0 0.8.5-4+b1
ii libcurl3t64-gnutls 8.14.1-2+deb13u2
ii libgcc-s1 14.2.0-19
ii libglib2.0-0t64 2.84.4-3~deb13u1
ii libgnutls30t64 3.8.9-3
ii libjson-c5 0.18+ds-1
ii libnl-3-200 3.7.0-2
ii libnuma1 2.0.19-1
ii libsasl2-2 2.1.28+dfsg1-9
ii libselinux1 3.8.1-1
ii libssh-4 0.11.2-1+deb13u1
ii libssh2-1t64 1.11.1-1
ii libtirpc3t64 1.3.6+ds-1
ii libvirt-common 11.3.0-3+deb13u1
ii libxml2 2.12.7+dfsg+really2.9.14-2.1+deb13u2
Versions of packages libvirt0 recommends:
ii libvirt-l10n 11.3.0-3+deb13u1
libvirt0 suggests no packages.
-- no debconf information
--- End Message ---
--- Begin Message ---
Source: libvirt
Source-Version: 11.3.0-3+deb13u2
Done: Andrea Bolognani <[email protected]>
We believe that the bug you reported is fixed in the latest version of
libvirt, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Andrea Bolognani <[email protected]> (supplier of updated libvirt package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Sun, 07 Dec 2025 16:22:24 +0100
Source: libvirt
Architecture: source
Version: 11.3.0-3+deb13u2
Distribution: trixie
Urgency: medium
Maintainer: Debian Libvirt Maintainers
<[email protected]>
Changed-By: Andrea Bolognani <[email protected]>
Closes: 1120119 1120584 1121280
Changes:
libvirt (11.3.0-3+deb13u2) trixie; urgency=medium
.
* [c5ef2ce] patches: Add backports
- backport/conf-Add-virDomainDefIDsParseString[...]
- backport/bhyve-Check-ACLs-before-parsing-[...]
- backport/libxl-Check-ACLs-before-parsing-[...]
- backport/lxc-Check-ACLs-before-parsing-[...]
- backport/vz-Check-ACLs-before-parsing-[...]
- backport/ch-Check-ACLs-before-parsing-[...]
- backport/qemu-Check-ACLs-before-parsing-[...]
- Perform ACL checks earlier, preventing malicious users
from potentially being able to crash the daemon
- CVE-2025-12748
- Closes: #1120584
* [9c44722] patches: Add backports
- backport/qemu-snapshot-Set-umask-for-qemu-img-[...]
- Ensure that newly-created snapshots are not world-readable
- CVE-2025-13193
- Closes: #1120119
* [74ba3ed] patches: Add backports
- backport/qemuxmlconftest-Improve-coverage-of-disk-[...]
- backport/qemu[...]-Setup-detect_zeroes-[...]
- Apply the detect_zeroes settings across all layers of the
backing chain instead of just the topmost one
- Closes: #1121280
Checksums-Sha1:
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58db571d5f817aa8554cc8ffbf64f5e1a05842f5 109400
libvirt_11.3.0-3+deb13u2.debian.tar.xz
bd573702bc5582f5321f1570af62ca1bc0a3144e 14035
libvirt_11.3.0-3+deb13u2_source.buildinfo
Checksums-Sha256:
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libvirt_11.3.0-3+deb13u2.dsc
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libvirt_11.3.0-3+deb13u2.debian.tar.xz
6a25580b58c299b201a34054840c2dc50bf606bdfa2863840cb4392724937c9d 14035
libvirt_11.3.0-3+deb13u2_source.buildinfo
Files:
552c06584a1511d6467d16556049f753 7803 libs optional
libvirt_11.3.0-3+deb13u2.dsc
146fdfc9c3bbd044e9ac1f958c242918 109400 libs optional
libvirt_11.3.0-3+deb13u2.debian.tar.xz
6ce225b88acdc7e84942f0ca4b02be32 14035 libs optional
libvirt_11.3.0-3+deb13u2_source.buildinfo
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