On Tue, Jul 07, 2015 at 11:34:34AM -0700, Stephen Hemminger wrote: > On Tue, 7 Jul 2015 15:55:21 +0100 > Julien Grall <julien.grall@xxxxxxxxxx> wrote: > > > The commit efb6de9b4ba0092b2c55f6a52d16294a8a698edd "netfilter: bridge: > > forward IPv6 fragmented packets" introduced a new function > > br_validate_ipv6 which take a reference on the inet6 device. Although, > > the reference is not released at the end. > > > > This will result to the impossibility to destroy any netdevice using > > ipv6 and bridge. > > > > It's possible to directly retrieve the inet6 device without taking a > > reference as all netfilter hooks are protected by rcu_read_lock via > > nf_hook_slow. > > > > Spotted while trying to destroy a Xen guest on the upstream Linux: > > "unregister_netdevice: waiting for vif1.0 to become free. Usage count = 1" > > > > Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx> > > Cc: Bernhard Thaler <bernhard.thaler@xxxxxxxx> > > Cc: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> > > Cc: fw@xxxxxxxxx > > Cc: ian.campbell@xxxxxxxxxx > > Cc: wei.liu2@xxxxxxxxxx > > Cc: Bob Liu <bob.liu@xxxxxxxxxx> > > > > --- > > Note that it's impossible to create new guest after this message. > > I'm not sure if it's normal. > > > > Changes in v2: > > - Don't take a reference to inet6. > > - This was "net/bridge: Add missing in6_dev_put in > > br_validate_ipv6" [0] > > > > [0] https://lkml.org/lkml/2015/7/3/443 > > --- > > net/bridge/br_netfilter_ipv6.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > I like this simple solution > > Acked-by: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx> Applied, thanks. -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
