On 07/10/2013 02:00 PM, Richard Weinberger wrote:
Yes,actually libvirt did up the veth devices, that's why only veth2& veth5 are down.
Where does libvirt up the devices? The debug log does not contain any "ip link set dev XXX up" commands. Also in src/util/virnetdevveth.c I'm unable to find such a ip command.
virLXCProcessSetupInterfaceBridged calls virNetDevSetOnline.
I need to know why these two devices are down, I believe they were up, your bridge and default-net looks good. So please show me your kernel message (dmesg), maybe it can give us some useful information.
This time veth4 and 5 are down.
---cut---
[ 44.158209] IPv6: ADDRCONF(NETDEV_UP): veth4: link is not ready [ 44.473317] IPv6: ADDRCONF(NETDEV_CHANGE): veth4: link becomes ready [ 44.473400] virbr0: topology change detected, propagating [ 44.473407] virbr0: port 5(veth4) entered forwarding state [ 44.473423] virbr0: port 5(veth4) entered forwarding state
veth4 were up here
[ 44.566186] device veth5 entered promiscuous mode [ 44.571234] IPv6: ADDRCONF(NETDEV_UP): veth5: link is not ready [ 44.571243] virbr0: topology change detected, propagating [ 44.571250] virbr0: port 6(veth5) entered forwarding state [ 44.571261] virbr0: port 6(veth5) entered forwarding state [ 44.902308] IPv6: ADDRCONF(NETDEV_CHANGE): veth5: link becomes ready [ 45.000580] virbr0: port 5(veth4) entered disabled state
and then it became down.
[ 45.348548] virbr0: port 6(veth5) entered disabled state
So, Some places disable the veth4 and veth5. I don't know in which case these two devices will be disabled. I still can't reproduce this problem in my test bed :( I need more information to analyse why these two device being disabled. So, can you run kernel with the below debug patch? diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c index d45e760..aed319b 100644 --- a/net/bridge/br_stp_if.c +++ b/net/bridge/br_stp_if.c @@ -103,7 +103,7 @@ void br_stp_disable_port(struct net_bridge_port *p) p->state = BR_STATE_DISABLED; p->topology_change_ack = 0; p->config_pending = 0; - + dump_stack(); br_log_state(p); br_ifinfo_notify(RTM_NEWLINK, p); diff --git a/net/core/dev.c b/net/core/dev.c index faebb39..9b1617b 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1368,6 +1368,7 @@ static int dev_close_many(struct list_head *head) list_for_each_entry(dev, head, unreg_list) { rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); + dump_stack(); call_netdevice_notifiers(NETDEV_DOWN, dev); } @@ -4729,8 +4730,10 @@ void __dev_notify_flags(struct net_device *dev, unsigned int old_flags) if (changes & IFF_UP) { if (dev->flags & IFF_UP) call_netdevice_notifiers(NETDEV_UP, dev); - else + else { + dump_stack(); call_netdevice_notifiers(NETDEV_DOWN, dev); + } } if (dev->flags & IFF_UP && Thanks!