Messages in this thread | | | Date | Mon, 31 Jul 2006 11:22:20 -0700 | From | Stephen Hemminger <> | Subject | Re: kernel hangs when trying to remove a bridge |
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On Sat, 29 Jul 2006 16:42:04 +0100 Rodrigo Ventura <yoda@isr.ist.utl.pt> wrote:
> > I'm using kernel 2.6.16 (-gentoo-r13 actually). A bridge iface br0 is setup > using eth1 and eth0.1 (VLAN) as slaves. To bring br0, what I do is to remove > the slaves from the bridge first, "ip link set dev br0 down" next, followed > by the brctl command to remove the bridge. What happens is that it seems it > tryes to destroy the bridge iface, and then hangs, with dmesg complaining, > periodically, about once a second, something like: > > unregister_netdevice: waiting for br0 to become free. Usage count = 1 > unregister_netdevice: waiting for br0 to become free. Usage count = 1 > unregister_netdevice: waiting for br0 to become free. Usage count = 1 > ... > > I say it partially hangs because commands like ifconfig hang (ps state=Disk > busy)... > To reboot the machine, a HARD reset is required, since, the shutdown process > hangs... >
Some broken protocol in the kernel, incremented a refcount but forgot to cleanup when notified on device removal.
There was a bug in the VLAN code that did that, not sure which version it was fixed in.
Do you have IPV6 installed (as a module)? In some kernel versions, IPV6 has a problem with device ref counting, and leaves a dangling reference.
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