Public bug reported:
Repro:
# Prep a backing disk
$ sudo fallocate -l 100M /tmp/zfsbase1
$ sudo fallocate -l 100M /tmp/zfsbase2
$ sudo zpool create zfsmirrortest mirror /tmp/zfsbase1 /tmp/zfsbase2
$ sudo zfs create -V 20M zfsmirrortest/vol1
$ cat > disk-zfs.xml << EOF
<disk type='block' device='disk'>
<driver name='qemu' type='raw'/>
<source dev='/dev/zvol/zfsmirrortest/vol1'/>
<target dev='vdc' bus='virtio'/>
</disk>
EOF
# Get a guest
$ uvt-kvm create --disk 5 --password=ubuntu h release=hirsute arch=s390x
label=daily
$ uvt-kvm wait h release=hirsute arch=s390x label=daily
# Attach and Detach disk
$ virsh attach-device h disk-zfs.xml
Device attached successfully
$ virsh detach-device h disk-zfs.xml
Device detached successfully
>From libvirts POV it is gone at this point
$ virsh domblklist h
Target Source
------------------------------------------------------------------
vda /var/lib/uvtool/libvirt/images/hirsute-2nd-zfs.qcow
vdb /var/lib/uvtool/libvirt/images/hirsute-2nd-zfs-ds.qcow
But the guest thinks still it is present
$ uvt-kvm ssh --insecure hirsute-2nd-zfs lsblk
...
vdc 252:32 0 20M 0 disk
This even remains a while after (not a race).
Any access to it in the guest will hang (as you'd expect of a non-existing
blockdev)
4 0 1758 1739 20 0 12140 4800 - S+ pts/0 0:00 |
\_ sudo mkfs.ext4 /dev/vdc
4 0 1759 1758 20 0 6924 1044 - D+ pts/0 0:00 |
\_ mkfs.ext4 /dev/vdc
The result above was originally found with hirsute-guest@hirsute-host on s390x
I do NOT see the same with groovy-guest@hirsute-host on s390x
I DO see the same with hirsute-guest@groovy-host on s390x
=> Guest version dependent not Host/Hipervisor dependent
I DO see the same with ZFS disks AND LVM disks being added&removed
=> not type dependent
I do NOT see the same on x86.
=> Arch dependent ??
... the evidence slowly points towards an issue in the guest, damn we are so
close to release - but non-fully detaching disks are critical in my POV :-/
Filing this as-is for awareness, but certainly this will need more debugging.
Unsure where this is going to eventually I'll now file it for
kernel/udev/systemd.
If there are any known issues/components that are related let me know please!
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Affects: udev (Ubuntu)
Importance: Critical
Status: New
** Tags: hirsute
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Changed in: udev (Ubuntu)
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/1925211
Title:
Hot-unplug of disks leaves broken block devices around in Hirsute
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