[SOLVED] Resuming suspended VM -> TASK ERROR: NUMA needs to be enabled for memory hotplug

[0xd149e38e]

I've got a VM that is suspended to disk.

When I try to resume, it errors with "TASK ERROR: NUMA needs to be enabled for memory hotplug"
I cannot enable NUMA, since the VM is locked.

So I wonder how to resolve that problem.

BTW: While suspended no backups were made.

Here is the config of the VM:

# qm config 114

agent: 1
balloon: 0
boot: order=scsi0;ide2;net0
cores: 6
cpu: kvm64,flags=+ibpb;+virt-ssbd;+amd-ssbd;+aes
hotplug: disk,network,usb,memory,cpu
ide2: zdata-pve:iso/debian-live-10.8.0-amd64-xfce.iso,media=cdrom
lock: suspended
memory: 8000
name: debian-xfce
net0: virtio=8A:58:3E:B7:F7:0F,bridge=vmbr1,firewall=1
numa: 0
ostype: l26
rng0: source=/dev/urandom
runningcpu: kvm64,+aes,+amd-ssbd,enforce,+ibpb,+kvm_pv_eoi,+kvm_pv_unhalt,+lahf_lm,+sep,+virt-ssbd
runningmachine: pc-i440fx-5.1+pve0
scsi0: local-zfs:vm-114-disk-0,discard=on,size=64G,ssd=1
scsihw: virtio-scsi-pci
serial0: socket
smbios1: uuid=d2c002a3-7f12-4896-bcc3-4462b22afd8d
sockets: 1
vmgenid: 58320bb1-22d7-4dd1-b1ac-e7860195a65d
vmstate: local-zfs:vm-114-state-suspend-2021-03-26

And the pveversion:

# pveversion -v

proxmox-ve: 6.3-1 (running kernel: 5.4.106-1-pve)
pve-manager: 6.3-6 (running version: 6.3-6/2184247e)
pve-kernel-5.4: 6.3-8
pve-kernel-helper: 6.3-8
pve-kernel-5.4.106-1-pve: 5.4.106-1
pve-kernel-5.4.103-1-pve: 5.4.103-1
pve-kernel-5.4.73-1-pve: 5.4.73-1
ceph-fuse: 12.2.11+dfsg1-2.1+b1
corosync: 3.1.0-pve1
criu: 3.11-3
glusterfs-client: 5.5-3
ifupdown: residual config
ifupdown2: 3.0.0-1+pve3
ksm-control-daemon: 1.3-1
libjs-extjs: 6.0.1-10
libknet1: 1.20-pve1
libproxmox-acme-perl: 1.0.8
libproxmox-backup-qemu0: 1.0.2-1
libpve-access-control: 6.1-3
libpve-apiclient-perl: 3.1-3
libpve-common-perl: 6.3-5
libpve-guest-common-perl: 3.1-5
libpve-http-server-perl: 3.1-1
libpve-storage-perl: 6.3-7
libqb0: 1.0.5-1
libspice-server1: 0.14.2-4~pve6+1
lvm2: 2.03.02-pve4
lxc-pve: 4.0.6-2
lxcfs: 4.0.6-pve1
novnc-pve: 1.1.0-1
proxmox-backup-client: 1.0.13-1
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.4-9
pve-cluster: 6.2-1
pve-container: 3.3-4
pve-docs: 6.3-1
pve-edk2-firmware: 2.20200531-1
pve-firewall: 4.1-3
pve-firmware: 3.2-2
pve-ha-manager: 3.1-1
pve-i18n: 2.2-2
pve-qemu-kvm: 5.1.0-8
pve-xtermjs: 4.7.0-3
pve-zsync: 2.0-4
qemu-server: 6.3-8
smartmontools: 7.2-pve2
spiceterm: 3.1-1
vncterm: 1.6-2
zfsutils-linux: 2.0.4-pve1

 

[oguz]

hi,

you can try running qm unlock VMID, and then you should be able to enable numa (also try taking a snapshot or backup)

 

[0xd149e38e]

After qm unlock, the symbol for suspended to disk disappeared.
I enabled NUMA. The Resume button changed to start.

New error message: TASK ERROR: memory size (8000) must be aligned to 512 for hotplugging

 

[oguz]

: TASK ERROR: memory size (8000) must be aligned to 512 for hotplugging

it needs to be a multiple of 512, e.g. 8192

 

[0xd149e38e]

I changed the memory to 8192, no error, but it did not start either. Then the resume button reappeared, and it started.
Hooray! But now I cannot unlock the encrypted disk.

OK my suspend to disk experiment has failed.

To sum it up:
It needs NUMA enabled and RAM to be a power of 2.
Anything else?

 

[0xd149e38e]

I did a restore from Backup, and it is wokring again.
Thanks @oguz

 

[oguz]

OK my suspend to disk experiment has failed.

To sum it up:
It needs NUMA enabled and RAM to be a power of 2.
Anything else?

to clarify, suspend to disk should work. numa was needed for memory hotplugging (which you had in your configuration)

you're welcome!

 

[0xd149e38e]

Ah OK. I think I just enabled the memory hotplugging, because I thought it's a cool feature.
I wasn't aware that NUMA needs to be enabled to use it.

Thanks again.