Package: libvirt-daemon
Version: 5.0.0-4
Severity: normal
Dear Maintainer,
* What led up to the situation?
When libvirt starts qemu, it copies the current mount namespace to qemu.
If we mount a filesystem, start some virtual machine and unmount the
filesystem, the filesystem is still mounted because the qemu process still
holds a reference on it.
* What exactly did you do (or not do) that was effective (or
ineffective)?
Steps to reproduce:
# truncate -s 16M fs.img
# mkfs.ext2 fs.img
# mount -t ext2 fs.img /mnt/test
# virsh start <some virtual machine>
# umount /mnt/test
* What was the outcome of this action?
Now, we are in a situation when the filesystem is no longer accessible at
/mnt/test, however it is still mounted. We can check it:
# losetup -a
- it still reports that /dev/loop0 is attached to fs.img
# fsck.ext2 -n fs.img
- reports "fs.img was not cleanly unmounted, check forced." even
though we ran the umount command
If we look at "/proc/`pidof qemu-system-aarch64`/mounts" or
"/proc/`pidof qemu-system-aarch64`/mountinfo", we can see that the
filesystem /mnt/test is still there.
* What outcome did you expect instead?
Unmount should work as expected. Libvirt should not interfere with mounts.
This bug only exists in Debian Buster. I doesn't exist in Debian Stretch.
-- System Information:
Debian Release: 10.1
APT prefers stable
APT policy: (500, 'stable')
Architecture: arm64 (aarch64)
Foreign Architectures: armel, armhf, amd64, i386
Kernel: Linux 5.2.11 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=cs_CZ.UTF-8, LC_CTYPE=cs_CZ.UTF-8 (charmap=UTF-8),
LANGUAGE=cs_CZ.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages libvirt-daemon depends on:
ii libacl1 2.2.53-4
ii libapparmor1 2.13.2-10
ii libaudit1 1:2.8.4-3
ii libavahi-client3 0.7-4+b1
ii libavahi-common3 0.7-4+b1
ii libblkid1 2.33.1-0.1
ii libc6 2.28-10
ii libcap-ng0 0.7.9-2
ii libcurl3-gnutls 7.64.0-4
ii libdbus-1-3 1.12.16-1
ii libdevmapper1.02.1 2:1.02.155-3
ii libfuse2 2.9.9-1
ii libgcc1 1:8.3.0-6
ii libgnutls30 3.6.7-4
ii libnetcf1 1:0.2.8-1+b2
ii libnl-3-200 3.4.0-1
ii libnl-route-3-200 3.4.0-1
ii libnuma1 2.0.12-1
ii libparted2 3.2-25
ii libpcap0.8 1.8.1-6
ii libpciaccess0 0.14-1
ii libsasl2-2 2.1.27+dfsg-1
ii libselinux1 2.8-1+b1
ii libssh2-1 1.8.0-2.1
hi libudev1 232-25+deb9u12
ii libvirt0 5.0.0-4
ii libxenmisc4.11 4.11.1+92-g6c33308a8d-2
ii libxenstore3.0 4.11.1+92-g6c33308a8d-2
ii libxentoollog1 4.11.1+92-g6c33308a8d-2
ii libxml2 2.9.4+dfsg1-7+b3
ii libyajl2 2.1.0-3
Versions of packages libvirt-daemon recommends:
ii libxml2-utils 2.9.4+dfsg1-7+b3
ii netcat-openbsd 1.195-2
ii qemu 1:3.1+dfsg-8+deb10u2
Versions of packages libvirt-daemon suggests:
pn libvirt-daemon-driver-storage-gluster <none>
pn libvirt-daemon-driver-storage-rbd <none>
pn libvirt-daemon-driver-storage-zfs <none>
ii libvirt-daemon-system 5.0.0-4
pn numad <none>
-- no debconf information
