[lxc-users] lxc stateful snapshot fails with "Pre dump script failed with 32512"

Thu Aug 4 15:38:12 UTC 2016

Tycho,

I hope I don't botch this thread up too much, I had set emails from
this list to digest mode and had to manually copy the content into a
new email...

No, I'm not using a custom liblxc build - I have the LXC daily PPA
added and am assuming that's where it's pulling from...  Not to say I
may have dome something crazy in my attempts to troubleshoot.  Is
there a specific package I can reinstall to ensure I'm getting the
appropriate library?

alex at osboxesDesktop:~$ apt-cache madison liblxc1
   liblxc1 | 2.0.3+master~20160729-2343-0ubuntu1~xenial |
http://ppa.launchpad.net/ubuntu-lxc/daily/ubuntu xenial/main amd64
Packages
   liblxc1 | 2.0.3-0ubuntu3~ubuntu16.04.1~ppa1 |
http://ppa.launchpad.net/ubuntu-lxc/lxd-git-master/ubuntu xenial/main
amd64 Packages
   liblxc1 | 2.0.3-0ubuntu3~ubuntu16.04.1~ppa1 |
http://ppa.launchpad.net/ubuntu-lxc/stable/ubuntu xenial/main amd64
Packages
   liblxc1 | 2.0.3-0ubuntu1~ubuntu16.04.1 |
http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
   liblxc1 | 2.0.0-0ubuntu2 | http://gb.archive.ubuntu.com/ubuntu
xenial/main amd64 Packages

Hi Alex,

On Wed, Aug 03, 2016 at 05:44:56PM -0400, Alex Kedrowitsch wrote:
>* Hi All,
*> >* I'm new to the Linux container scene and am having issues with making
*>* stateful container snapshots. My ultimate goal is to get "lxc move" to
*>* work, but that fails with the same error as when I try "lxc snapshot <>
*>* --stateful", so I'm starting with the lowest common denominator.
*> >* Environment:
*>* VM running Ubuntu 16.04, Kernel 4.4.0-31-generic
*>* LXD version 2.0.3
*>* CRIU version 2.0 (no special commits)
*> >* I am following the steps outlined here: (
*>* http://insights.ubuntu.com/2016/04/25/lxd-2-0-live-migration-912/
<http://insights.ubuntu.com/2016/04/25/lxd-2-0-live-migration-912/>)
as well
*>* as trying to match the requirements here: (
*>* https://insights.ubuntu.com/2015/05/06/live-migration-in-lxd/
<https://insights.ubuntu.com/2015/05/06/live-migration-in-lxd/>) (this
second
*>* article is invaluable, but would be great if it was updated for the latest
*>* changes to LXD, like not including the step to remove lxcfs, which broke my
*>* installation of LXD when I did.)
*
Good point, I should probably write an updated post :). Anyway,
stgraber's post here:
https://www.stgraber.org/2016/04/25/lxd-2-0-live-migration-912/

is pretty recent (i.e. migration should be pretty "no frills" right
now).

>* I was previously able to make stateful snapshots without error, but was
*>* unable to restore them; however, today I am unable to even make the
*>* snapshots.  Stateless snapshots can be made without error.
*> >* Appears to be similar to this issue
(https://github.com/lxc/lxd/issues/2110
<https://github.com/lxc/lxd/issues/2110>),
*>* where stgraber believes it's a bug with CRIU serializing sockets, but I was
*>* unable to find the bug report on Launchpad.
*> >* Here are my logs.  Thanks for the help!
*> >* Terminal Commands/output:
*>* alex at osboxesDesktop
<http://lists.linuxcontainers.org/listinfo/lxc-users>:~$ lxc snapshot
stringhalty-judie snap2 --stateful
*>* error: snapshot dump failed
*>* (00.041465) Error (action-scripts.c:60): One of more action scripts failed
*>* (00.041478) Error (cr-dump.c:1621): Pre dump script failed with 32512!
*
Are you using a custom built liblxc? Looks like you might be missing
ebb088e115fd81f86602af8a386ee41470c71a73.

Tycho

>* Container info:
*>* alex at osboxesDesktop
<http://lists.linuxcontainers.org/listinfo/lxc-users>:~$ lxc info
stringhalty-judie
*>* Name: stringhalty-judie
*>* Architecture: x86_64
*>* Created: 2016/08/03 20:07 UTC
*>* Status: Running
*>* Type: persistent
*>* Profiles: default
*>* Pid: 9665
*>* Ips:
*>*   eth0:    inet    10.29.26.131    vethBI73UQ
*>*   eth0:    inet6    fe80::216:3eff:fe38:4351    vethBI73UQ
*>*   lo:    inet    127.0.0.1
*>*   lo:    inet6    ::1
*>* Resources:
*>*   Processes: 26
*>*   Memory usage:
*>*     Memory (current): 41.85MB
*>*     Memory (peak): 179.00MB
*>*   Network usage:
*>*     lo:
*>*       Bytes received: 264 bytes
*>*       Bytes sent: 264 bytes
*>*       Packets received: 4
*>*       Packets sent: 4
*>*     eth0:
*>*       Bytes received: 6.60kB
*>*       Bytes sent: 2.17kB
*>*       Packets received: 43
*>*       Packets sent: 17
*>* Snapshots:
*>*   snap1 (taken at 2016/08/03 20:49 UTC) (stateless)
*> >* snapshot_dump_###.log:
*>* (00.000023) Probing sock diag modules
*>* (00.000053) Done probing
*>* (00.028278) ========================================
*>* (00.028291) Dumping processes (pid: 9665)
*>* (00.028292) ========================================
*>* (00.028293) Running pre-dump scripts
*>* (00.028306)     [@ÑÙ È]
*>* (00.041465) Error (action-scripts.c:60): One of more action scripts failed
*>* (00.041478) Error (cr-dump.c:1621): Pre dump script failed with 32512!
*> > >* Excerpt from lxc.log:
*>*             lxc 20160803171813.590 DEBUG    lxc_commands -
*>* commands.c:lxc_cmd_get_state:579 - 'stringhalty-judie' is in 'RUNNING' state
*>*             lxc 20160803171819.956 INFO     lxc_confile -
*>* confile.c:config_idmap:1520 - read uid map: type u nsid 0 hostid 231072
*>* range 65536
*>*             lxc 20160803171819.956 INFO     lxc_confile -
*>* confile.c:config_idmap:1520 - read uid map: type g nsid 0 hostid 231072
*>* range 65536
*>*             lxc 20160803171819.957 DEBUG    lxc_commands -
*>* commands.c:lxc_cmd_handler:893 - peer has disconnected
*>*             lxc 20160803171819.957 DEBUG    lxc_commands -
*>* commands.c:lxc_cmd_handler:893 - peer has disconnected
*>*             lxc 20160803171819.957 DEBUG    lxc_commands -
*>* commands.c:lxc_cmd_get_state:579 - 'stringhalty-judie' is in 'RUNNING' state
*>*             lxc 20160803171819.963 DEBUG    lxc_commands -
*>* commands.c:lxc_cmd_handler:893 - peer has disconnected
*>*             lxc 20160803171819.975 DEBUG    lxc_commands -
*>* commands.c:lxc_cmd_handler:893 - peer has disconnected
*>*             lxc 20160803171819.975 INFO     lxc_criu - criu.c:exec_criu:422
*>* - execing: /usr/sbin/criu dump --tcp-established --file-locks --link-remap
*>* --manage-cgroups=full --ext-mount-map auto --enable-external-sharing
*>* --enable-external-masters --enable-fs hugetlbfs --enable-fs tracefs -D
*>* /var/lib/lxd/containers/stringhalty-judie/state -o
*>* /var/lib/lxd/containers/stringhalty-judie/state/dump.log -vvvvvv
*>* --action-script \D0\D1\DE \C8 -t 9665 --freeze-cgroup
*>* /sys/fs/cgroup/freezer///lxc/stringhalty-judie --ext-mount-map
*>* /dev/console:console --external tty[8812:e] --force-irmap --ghost-limit
*>* 859535847452 --leave-running
*>*             lxc 20160803171819.975 DEBUG    lxc_commands -
*>* commands.c:lxc_cmd_handler:893 - peer has disconnected
*>*             lxc 20160803171820.142 ERROR    lxc_criu - criu.c:do_dump:930 -
*>* dump signaled with 11
*
>* _______________________________________________
*>* lxc-users mailing list
*>* lxc-users at lists.linuxcontainers.org
<http://lists.linuxcontainers.org/listinfo/lxc-users>
*>* http://lists.linuxcontainers.org/listinfo/lxc-users
<http://lists.linuxcontainers.org/listinfo/lxc-users>*
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