Re: kernel hangs when trying to remove a bridge
- From: Stephen Hemminger <shemminger@xxxxxxxx>
- Date: Mon, 31 Jul 2006 11:22:20 -0700
On Sat, 29 Jul 2006 16:42:04 +0100
Rodrigo Ventura <yoda@xxxxxxxxxxxxxx> 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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- From: Rodrigo Ventura
- kernel hangs when trying to remove a bridge
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