[PVE-User] pve-kernel-4.13.13-5-pve hang with high IO

[Eneko Lacunza]

Hi all,

We just installed Proxmox 5.1 on a i7-3770 CPU @ 3.40GHz machine with 
32GB of RAM two days ago. It has 4 disks with mdraid6.

It has been working very well for two days; more than 1TB of VM disk 
have been transferred to that Proxmox, and they have been moved from a 
Directory based storage to a LVM-thin storage successfully.

Last night at 23:32 it hanged, and we had to hard-reboot it this 
morning. On that moment it was receiving  about 100MB/s of network 
traffic to a VM backed on LVM-thin disk, and writing the data to disk 
(several rsync transfers). Don't know if that activity is related to the 
hang really, syslog just shows about 20 lines of garbage.

Anyone has seen something like this lately? I first thought about 
Meltdown/Spectre patches and reboot issues, but don't know what's the 
state in current Proxmox kernels.

I can see the following in kernel boot log, doesn't seem it is loading a 
very recent microcode:
Jan 24 09:18:30 orion kernel: [    0.000000] microcode: microcode 
updated early to revision 0x1c, date = 2015-02-26

Also BIOS seems old, shouldn't be patched:
Jan 24 09:18:30 orion kernel: [    0.000000] DMI: System manufacturer 
System Product Name/P8H77-M PRO, BIOS 9002 05/30/2014

# pveversion -v
proxmox-ve: 5.1-36 (running kernel: 4.13.13-5-pve)
pve-manager: 5.1-43 (running version: 5.1-43/bdb08029)
pve-kernel-4.13.13-5-pve: 4.13.13-36
libpve-http-server-perl: 2.0-8
lvm2: 2.02.168-pve6
corosync: 2.4.2-pve3
libqb0: 1.0.1-1
pve-cluster: 5.0-19
qemu-server: 5.0-20
pve-firmware: 2.0-3
libpve-common-perl: 5.0-25
libpve-guest-common-perl: 2.0-14
libpve-access-control: 5.0-7
libpve-storage-perl: 5.0-17
pve-libspice-server1: 0.12.8-3
vncterm: 1.5-3
pve-docs: 5.1-16
pve-qemu-kvm: 2.9.1-6
pve-container: 2.0-18
pve-firewall: 3.0-5
pve-ha-manager: 2.0-4
ksm-control-daemon: 1.2-2
glusterfs-client: 3.8.8-1
lxc-pve: 2.1.1-2
lxcfs: 2.0.8-1
criu: 2.11.1-1~bpo90
novnc-pve: 0.6-4
smartmontools: 6.5+svn4324-1


Thanks a lot
Eneko

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