[CRIU] c/r support for cgroup namespaces

[Tycho Andersen]

On Mon, Feb 15, 2016 at 07:56:09PM +0300, Pavel Emelyanov wrote:
> On 02/11/2016 08:37 PM, Tycho Andersen wrote:
> > Hi guys,
> > 
> > Here's a draft set for supporting cgroup namespaces. The one obvious nit I can
> > think of is in include/namespaces.h, although there are probably others. I
> > haven't done extenstive testing on this, but I'm hoping to bang on it more next
> > week.
> > 
> > Also, when running the test in a user ns, I get what I think is an unrelated
> > network failure due to the way 4.4 does things, but I haven't looked into it
> > yet. If anyone has any ideas about this that would be great, but I'll take a
> > look now.
> 
> Before looking into patches, I have something to say about why test fail :) See below
> 
> > $ sudo ./zdtm.py run -t zdtm/live/static/cgroupns
> > Checking feature cgroupns
> > === Run 1/1 ================
> > 
> > ====================== Run zdtm/live/static/cgroupns in h ======================
> > Start test
> > Test is SUID
> > ./cgroupns --pidfile=cgroupns.pid --outfile=cgroupns.out --dirname=cgroupns.test
> > Run criu dump
> > Run criu restore
> > Wait for zdtm/live/static/cgroupns to die for 0.100000
> > Removing dump/zdtm/live/static/cgroupns/62
> > ===================== Test zdtm/live/static/cgroupns PASS ======================
> > 
> > ===================== Run zdtm/live/static/cgroupns in ns ======================
> > Start test
> > Test is SUID
> > ./cgroupns --pidfile=cgroupns.pid --outfile=cgroupns.out --dirname=cgroupns.test
> > Run criu dump
> > =[log]=> dump/zdtm/live/static/cgroupns/130/1/dump.log
> > ------------------------ grep Error ------------------------
> > (00.015021) Error (net.c:228): Unsupported link 2 (type 776 kind sit)
> 
> That's IPv6 over IPv4 tunnel a.k.a. SIT device
> 
> https://github.com/xemul/criu/issues/11

Yep, I think I have some basic patches for this, although I don't know
much about the tunnels so they may be wrong :). Anyway, I'll try and
send out that and an updated cgroup ns set soon. I'd be happy to
incorporate thoughts on this set in the meantime.

Thanks,

Tycho

> > (00.018762) Error (namespaces.c:829): Namespaces dumping finished with error 65280
> > (00.021230) Error (cr-dump.c:1580): Dumping FAILED.
> > ------------------------ ERROR OVER ------------------------
> > ############### Test zdtm/live/static/cgroupns FAIL at CRIU dump ###############
> > Wait for zdtm/live/static/cgroupns to die for 0.100000
> > ##################################### FAIL #####################################
> > 
> > Thoughts welcome!
> > 
> > Tycho
> > 
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> > 
>