Re: [libvirt] PATCH: 0/7: Re-factor LXC driver
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. If you can capture an strace it can probably
help me diagnose the problem
strace -f -ff -o net.log -s 30000 -p `pid of libvirtd`
IIRC, you said removing the bit of code which closed all open file descriptor
would make it work again ? If you can grab an strace with that change in
too I can compare and figure out where we're going wrong.
Daniel
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