[lxc-users] LXC, criu and cgroups...

[Tycho Andersen]

On Tue, Apr 07, 2015 at 10:30:39PM +0200, Dirk Geschke wrote:
> Hi Tycho,
> 
> the process list is interesting. On the source host I see:
> 
>    root      4653  0.7  0.6  93844 14248 pts/1    Sl+  22:06   0:06 lxd --debug --group lxcuser --tcp 192.168.1.233:8443
>    root      4725  1.8  0.5 108416 12196 pts/1    S+   22:06   0:16 rsync -arvPz --devices --partial /var/lib/lxd/lxc/ubuntix/rootfs/ localhost:/tmp/foo -e sh -c "nc -U /var/tmp/lxd_rsync_915745248"
>    root      4727  0.0  0.0   4192   508 pts/1    S+   22:06   0:00 sh -c nc -U /var/tmp/lxd_rsync_915745248 localhost rsync --server -vlogDtprze.iLsf --partial . /tmp/foo
>    root      4728  0.0  0.0   8724   584 pts/1    S+   22:06   0:00 nc -U /var/tmp/lxd_rsync_915745248
> 
> and on the target host:
> 
>    root     13155  1.0  0.4 109140 14180 pts/1    Sl+  22:06   0:10 lxd --debug --group lxcuser --tcp 192.168.1.234:8443
>    root     13234  0.0  0.1  78268  3820 pts/1    S+   22:06   0:00 rsync --server -vlogDtprze.iLsfx --devices --partial .  /var/lib/lxd/lxc/ubuntix/rootfs/
>    root     13235  0.3  0.1 100140  3748 pts/1    S+   22:06   0:03 rsync --server -vlogDtprze.iLsfx --devices --partial .  /var/lib/lxd/lxc/ubuntix/rootfs/
> 
> And this hungs now for several minutes.

Is it doing i/o? Looks to me like it's (trying) to send the rootfs.
Adding the f argument to ps (i.e. something like `ps auxf`) will show
it in tree form, so you can figure out which rsync server corresponds
to which lxd easily.

> I'm not sure, but maybe it is related to the rowhammer fix?
> 
>    Apr  7 22:06:04 otto kernel: [  205.054216] The pagemap bits 55-60 has changed their meaning! See the linux/Documentation/vm/pagemap.txt for details.
>    Apr  7 22:06:04 otto kernel: [  205.054269] Bits 55-60 of /proc/PID/pagemap entries are about to stop being page-shift some time soon. See the linux/Documentation/vm/pagemap.txt for details.

I wouldn't think so. It looks like rsync is just hung (or sending
things really slowly).

Tycho

> Best regards 
> 
> Dirk
> 
> -- 
> +----------------------------------------------------------------------+
> | Dr. Dirk Geschke       / Plankensteinweg 61    / 85435 Erding        |
> | Telefon: 08122-559448  / Mobil: 0176-96906350 / Fax: 08122-9818106   |
> | dirk at geschke-online.de / dirk at lug-erding.de  / kontakt at lug-erding.de |
> +----------------------------------------------------------------------+
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