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    SubjectRe: kernel hangs when trying to remove a bridge
    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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