Public bug reported:
When using automatic suspend at reboot/shutdown, it makes sense to store
the suspend data on a separate partition to ensure there is always
enough available space. However this does not work, as the partition
gets unmounted before or during libvirt suspend.
Steps to reproduce:
1. Use Ubuntu 18.04.02 LTS
2. Install libvirt + qemu-kvm
3. Start a guest
4. Set libvirt-guests to suspend at shutdown/reboot by editing
/etc/default/libvirt-guests
5. Create a fstab entry to mount a separate partition to mount point
/var/lib/libvirt/qemu/save. Then run sudo mount /var/lib/libvirt/qemu/save to
mount the partition.
6. Reboot
Expected result:
The guest suspend data would be written to the /var/lib/libvirt/qemu/save,
resulting in the data being stored at the partition specified in fstab. At
boot, this partition would be mounted as specified in fstab and libvirt-guest
would be able to read the data and restore the guests.
Actual result:
The partition gets unmounted before libvirt-guests suspends the guests,
resulting in the data being stored on the partition containing the root file
system. During boot, the empty partition gets mounted over the non-empty
/var/lib/libvirt/qemu/save directory, resulting in libvirt-guests being unable
to read the saved data.
As a side effect, the saved data is using up space on the root partition
even if the directory appears empty.
Here is some of the relevant lines from the journal:
Jun 14 00:00:04 libvirt-host blkdeactivate[4343]: Deactivating block devices:
Jun 14 00:00:04 libvirt-host systemd[1]: Unmounted /var/lib/libvirt/qemu/save.
Jun 14 00:00:04 libvirt-host blkdeactivate[4343]: [UMOUNT]: unmounting
libvirt_lvm-suspenddata (dm-3) mounted on /var/lib/libvirt/qemu/save... done
Jun 14 00:00:04 libvirt-host libvirt-guests.sh[4349]: Running guests on default
URI: vps1, vps2, vps3
Jun 14 00:00:04 libvirt-host blkdeactivate[4343]: [MD]: deactivating raid1
device md1... done
Jun 14 00:00:05 libvirt-host libvirt-guests.sh[4349]: Suspending guests on
default URI...
Jun 14 00:00:05 libvirt-host libvirt-guests.sh[4349]: Suspending vps1: ...
Jun 14 00:00:05 libvirt-host blkdeactivate[4343]: [LVM]: deactivating Volume
Group libvirt_lvm... skipping
Jun 14 00:00:10 libvirt-host libvirt-guests.sh[4349]: Suspending vps1: 5.989 GiB
Jun 14 00:00:15 libvirt-host libvirt-guests.sh[4349]: Suspending vps1: ...
Jun 14 00:00:20 libvirt-host libvirt-guests.sh[4349]: Suspending vps1: ...
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1832859
Title:
during shutdown libvirt-guests gets stopped after file system unmount
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