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Re: [libvirt] PATCH: 0/7: Re-factor LXC driver



On Wed, Aug 06, 2008 at 10:41:42AM +0100, Daniel P. Berrange wrote:
> On Tue, Aug 05, 2008 at 02:17:27PM -0700, Dan Smith wrote:
> > DB> This is a long overdue followup to my previous set of patches to
> > DB> make the LXC driver use the new domain XML apis.
> > 
> > Have you been able to test this with NET_NS support enabled yet?
> > 
> > I am hitting the same issue I was before.  On starting an LXC domain
> > with a network interface, the daemon finishes the action and reports
> > a good status to virsh.  The domain fails to start, with the following
> > in the per-domain log file:
> > 
> >   DEBUG: lxc_container.c: lxcContainerStart (clone() returned, 8082)
> >   libvir: Linux Container error : internal error read of fd 6 failed: Input/output error 
> >   DEBUG: veth.c: vethDelete (veth: veth2)
> > 
> > However, now, the daemon crashes well after leaving the LXC driver's
> > domain startup process.  From the timing, I'd guess it's in some event
> > (or SIGCHLD) handler, but I can't reproduce it in gdb to get more
> > information.
> 
> That's not good. There should be no SIGCHLD's anywhere now - the container
> double-forks into the background. Its probably some error in the cleanup
> path - valgrind may help if gdb fails.
> 
> > This looks to be identical in root cause to what I was seeing with the
> > previous set of patches, and was unable to figure out why file
> > descriptor 6 was getting prematurely closed.  I'll get started on
> > debugging it again tomorrow, but it might be good if you can reproduce
> > it as well :)
> 
> I've unfortunately still not got a  kernel build with all the neccessary
> NET_NS bits added on. 

Turns out this wasn't needed. Simply commenting out use of the CLONE_NETNS
flag and using a currently 2.6.26 kernel is sufficient to expose the container
failing to start, and the libvirtd daemon crashing. So I'll track these down
and fix it

Daniel
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