[PVE-User] pve & ceph nautilus: Since today I get an error when trying to remove a VM-template

[Rainer Krienke]

Hello,

since today I have a strange Problem with my pve installation. The
storage backend used is a "external" ceph nautilus cluster. All VMs are
created from templates as full clones. It seems whenever I delete a
VM-template I get an error. Removing VMs (not templates) is OK. Removing
a template results in this kind of error messages since today:

Removing all snapshots: 0% complete...failed.
Could not remove disk 'ceph-pxa:base-174-disk-0', check manually: error
during cfs-locked 'storage-ceph-pxa' operation: rbd snap purge
'base-174-disk-0' error: Removing all snapshots: 0% complete...failed.
Removing all snapshots: 0% complete...failed.
error during cfs-locked 'storage-ceph-pxa' operation: rbd snap purge
'base-174-disk-0' error: Removing all snapshots: 0% complete...failed.

TASK OK

Until today this worked always fine. R  Inside of pve the template is
deleted, however on ceph the template file is still there in form of a
rbd with a protected snapshot (which seems to be sane to me):

ceph$ rbd snap ls  pxa-rbd/base-174-disk-0
SNAPID NAME     SIZE   PROTECTED TIMESTAMP
  2992 __base__ 32 GiB yes       Mon Jan 18 11:59:49 2021

I unprotected the snapshot, removed it and then removed the base-rbd
which worked just fine. So on the ceph side everything looks good, but
on the pve side I get the strange error. This started today after I
started to create a pve-snapshot of a VM and the "include memory"
checkbox was on, allthough I didn't want RAM to be included. So I
stopped the snapshot via web-gui. I got an error saying:

Qemu Guest Agent is not running - VM 185 qmp command 'guest-ping' failed
- got timeout
snapshot create failed: starting cleanup
TASK ERROR: VM 185 qmp command 'savevm-start' failed - VM snapshot
already started

Perhaps this has left a lock somewhere, but perhaps it has nothing to do
with the problem itself.

Does anyone have an idea what might be wrong or how to find out more?

Thanks
Rainer

Here some more infos:

root at pxsrv1: dpkg -l|grep pve
ii  pve-cluster                         6.2-1
amd64        "pmxcfs" distributed cluster filesystem for Proxmox Virtual
Environment.
ii  pve-container                        3.2-2
all          Proxmox VE Container management tool
ii  pve-docs                             6.2-6
all          Proxmox VE Documentation
ii  pve-edk2-firmware                    2.20200531-1
all          edk2 based firmware modules for virtual machines
ii  pve-firewall                         4.1-3
amd64        Proxmox VE Firewall
ii  pve-firmware                         3.1-3
all          Binary firmware code for the pve-kernel
ii  pve-ha-manager                       3.1-1
amd64        Proxmox VE HA Manager
ii  pve-i18n                             2.2-1
all          Internationalization support for Proxmox VE
ii  pve-kernel-5.3                       6.1-6
all          Latest Proxmox VE Kernel Image
ii  pve-kernel-5.3.10-1-pve              5.3.10-1
amd64        The Proxmox PVE Kernel Image
rc  pve-kernel-5.3.18-1-pve              5.3.18-1
amd64        The Proxmox PVE Kernel Image
ii  pve-kernel-5.3.18-3-pve              5.3.18-3
amd64        The Proxmox PVE Kernel Image
ii  pve-kernel-5.4                       6.2-7
all          Latest Proxmox VE Kernel Image
rc  pve-kernel-5.4.34-1-pve              5.4.34-2
amd64        The Proxmox PVE Kernel Image
ii  pve-kernel-5.4.44-2-pve              5.4.44-2
amd64        The Proxmox PVE Kernel Image
ii  pve-kernel-5.4.65-1-pve              5.4.65-1
amd64        The Proxmox PVE Kernel Image
ii  pve-kernel-helper                    6.2-7
all          Function for various kernel maintenance tasks.
ii  pve-lxc-syscalld                     0.9.1-1
amd64        PVE LXC syscall daemon
ii  pve-manager                          6.2-12
amd64        Proxmox Virtual Environment Management Tools
ii  pve-qemu-kvm                         5.1.0-3
amd64        Full virtualization on x86 hardware
ii  pve-xtermjs                          4.7.0-2
amd64        Binaries built from the Rust termproxy crate
ii  smartmontools                        7.1-pve2
amd64        control and monitor storage systems using S.M.A.R.T.

root at pxsrv1:/etc/pve#  pvecm status
Cluster information
-------------------
Name:             pxa
Config Version:   5
Transport:        knet
Secure auth:      on

Quorum information
------------------
Date:             Mon Jan 18 14:02:08 2021
Quorum provider:  corosync_votequorum
Nodes:            5
Node ID:          0x00000001
Ring ID:          1.327
Quorate:          Yes

Votequorum information
----------------------
Expected votes:   5
Highest expected: 5
Total votes:      5
Quorum:           3
Flags:            Quorate

Membership information
----------------------
    Nodeid      Votes Name
0x00000001          1 a.b.c.d (local)
0x00000002          1 a.b.c.d
0x00000003          1 a.b.c.d
0x00000004          1 a.b.c.d
0x00000005          1 a.b.c.d
root at pxa1:/etc/pve#

root at pxa1:/etc/pve#  pvecm status
Cluster information
-------------------
Name:             pxa
Config Version:   5
Transport:        knet
Secure auth:      on

Quorum information
------------------
Date:             Mon Jan 18 14:06:08 2021
Quorum provider:  corosync_votequorum
Nodes:            5
Node ID:          0x00000001
Ring ID:          1.327
Quorate:          Yes

Votequorum information
----------------------
Expected votes:   5
Highest expected: 5
Total votes:      5
Quorum:           3
Flags:            Quorate

Membership information
----------------------
    Nodeid      Votes Name
0x00000001          1 a.b.c.d
0x00000002          1 a.b.c.d
0x00000003          1 a.b.c.d
0x00000004          1 a.b.c.d
0x00000005          1 a.b.c.d
-- 
Rainer Krienke, Uni Koblenz, Rechenzentrum, A22, Universitaetsstrasse  1
56070 Koblenz, Web: http://www.uni-koblenz.de/~krienke, Tel: +49261287 1312
PGP: http://www.uni-koblenz.de/~krienke/mypgp.html,     Fax: +49261287
1001312