[pkg-lxc-devel] Bug#894067: lxc: snapshotclone fails to work (LVM backend)

[Peter.Chubb at data61.csiro.au]

Package: lxc
Version: 1:2.0.9-6
Severity: normal

Dear Maintainer,

I created an instance of stretch Debian on ext4 on a
thinly-provisioned LVM backend.  I attempt to clone it using a
snapshot.  Thus:

   $ sudo vgcreate lxc --dataalignment 512k -s 1M /dev/md0
(sizes chosen to match chunksize and stripewidth of underlying device)

   $ sudo lvcreate -l 50%VG --type=thin-pool -n lxc-pool lxc
   $ sudo lxc-create -n 'stretch-thin' --fssize=8G --fstype ext4 -B lvm --thinpool lxc-pool -t debian --  --mirror=http://mirror.aarnet.edu.au/debian/ -r stretch

Then:
   $ sudo lxc-copy -l DEBUG -s -n stretch-thin -N stretch-copy
   Using default stripesize 64.00 KiB.
   Logical volume "stretch-copy" created.
   lxc-copy: lxccontainer.c: container_destroy: 2576 Error destroying rootfs for stretch-copy
   clone failed

At this point, the container is half-created.
$ sudo ls -l /var/lib/lxc/stretch-copy/
total 4
-rw-r--r-- 1 root root 732 Mar 26 14:35 config
drwxr-xr-x 2 root root   6 Mar 26 14:35 rootfs

$ sudo lvs
  LV           VG  Attr       LSize   Pool     Origin       Data%  Meta%  Move Log Cpy%Sync Convert
  lxc-pool     lxc twi-aotz-- 931.38g                       0.04   0.44 
  stretch-copy lxc Vwi---tz-k   8.00g lxc-pool stretch-thin
  stretch-thin lxc Vwi-a-tz--   8.00g lxc-pool              4.13

BUT:

$ sudo ls -l /dev/lxc
total 0
lrwxrwxrwx 1 root root 7 Mar 26 14:35 stretch-thin -> ../dm-4

and:

$ sudo lxc-start -n stretch-copy
lxc-start: lxccontainer.c: wait_on_daemonized_start: 754 Received container state "ABORTING" instead of "RUNNING"
lxc-start: tools/lxc_start.c: main: 368 The container failed to start.

-- System Information:
Debian Release: 9.4
  APT prefers stable
  APT policy: (500, 'stable'), (500, 'oldstable'), (300, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-6-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE=en_AU:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages lxc depends on:
ii  libapparmor1  2.11.0-3+deb9u2
ii  libc6         2.27-2
ii  libcap2       1:2.25-1
ii  libgnutls30   3.5.8-5+deb9u3
ii  liblxc1       1:2.0.9-6
ii  libseccomp2   2.3.1-2.1
ii  libselinux1   2.6-3+b3
ii  lsb-base      9.20161125
ii  python3       3.6.4-1
ii  python3-lxc   1:2.0.9-6

Versions of packages lxc recommends:
ii  bridge-utils  1.5-13+deb9u1
ii  debootstrap   1.0.89
ii  dirmngr       2.1.18-8~deb9u1
ii  dnsmasq-base  2.76-5+deb9u1
ii  gnupg         2.1.18-8~deb9u1
ii  iptables      1.6.0+snapshot20161117-6
ii  libpam-cgfs   2.0.7-1
ii  lxcfs         2.0.7-1
ii  openssl       1.1.0f-3+deb9u1
ii  rsync         3.1.2-1+deb9u1
ii  uidmap        1:4.4-4.1

Versions of packages lxc suggests:
pn  apparmor     <none>
pn  btrfs-progs  <none>
ii  lvm2         2.02.168-2

-- no debconf information