[Pkg-ganeti-devel] Bug#875435: ganeti: random freeze on some kvm guests in a jessie ganeti cluster

[Thomas Pierson]

Package: ganeti
Version: 2.15.2-1~bpo8+1
Severity: normal

Dear Ganeti maintainers,

I get random freeze on kvm guests in a Jessie Ganeti cluster.

Last time it happened 2 times on the same guest at one week of interval.
Each time the guest only give ping response but nothing more and it get
back to work only after a `gnt-instance reboot`.

I did not find trace or error in log files in the guest or in the hosts.

I use ganeti and drbd packages from jessie-backports and kvm and kernel
packages from jessie archive.
The guest is a Debian Wheezy system but it got trouble on Debian Jessie
guest too.
One month ago I already post a bug report against the linux package
about disk lock on some Jessie guests in the same cluster:
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=870471
In that cases I got something on the guests kernel logs so maybe it's a
different issue, maybe not…

Any idea of how I can troubleshoot this issue?
Is there any log file to see the output of qemu-kvm for each instances?
Should I use a kernel and qemu-kvm package from jessie-backports too?

Regards,
Thomas Pierson


-- Package-specific info:
Version symlinks:
  /etc/ganeti/share -> /usr/share/ganeti/2.15
  /etc/ganeti/lib -> /usr/lib/ganeti/2.15
Cluster config version: 2.15.2
Address family: IPv4
Enabled hypervisors: kvm
kvm hypervisor parameters:
  acpi=True
  boot_order=disk
  cpu_cores=0
  cpu_mask=all
  cpu_sockets=0
  cpu_threads=0
  disk_aio=threads
  disk_cache=default
  disk_type=paravirtual
  kernel_args=ro
  kvm_path=/usr/bin/kvm
  migration_bandwidth=32
  migration_downtime=30
  migration_mode=live
  migration_port=8102
  nic_type=paravirtual
  reboot_behavior=reboot
  root_path=/dev/vda1
  security_model=none
  serial_console=True
  serial_speed=38400
  spice_ip_version=0
  spice_playback_compression=True
  spice_tls_ciphers=HIGH:-DES:-3DES:-EXPORT:-DH
  spice_use_tls=False
  spice_use_vdagent=True
  use_chroot=False
  use_localtime=False
  user_shutdown=False
  vhost_net=False
  virtio_net_queues=1
  vnc_tls=False
  vnc_x509_verify=False
  vnet_hdr=True

-- System Information:
Debian Release: 8.8
  APT prefers oldstable-updates
  APT policy: (500, 'oldstable-updates'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/56 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages ganeti depends on:
ii  adduser              3.113+nmu3
ii  ganeti-2.15          2.15.2-1~bpo8+1
ii  ganeti-haskell-2.15  2.15.2-1~bpo8+1
ii  ganeti-htools-2.15   2.15.2-1~bpo8+1
ii  python               2.7.9-1

Versions of packages ganeti recommends:
ii  drbd-utils                   8.9.5-1~bpo8+1
ii  drbd8-utils                  2:8.9.5-1~bpo8+1
ii  ganeti-instance-debootstrap  0.16-1~bpo8+1
ii  ndisc6                       1.0.1-1+deb8u1
ii  qemu-kvm                     1:2.1+dfsg-12+deb8u6

Versions of packages ganeti suggests:
pn  blktap-dkms  <none>
pn  ganeti-doc   <none>
ii  molly-guard  0.4.5-1.1

-- no debconf information