From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jurriaan Subject: Re: 2.6.8-rc4-bk1 problem: unregister_netdevice: waiting for ppp0 to become free. Usage count = 1 Date: Thu, 26 Aug 2004 18:46:10 +0200 Sender: netdev-bounce@oss.sgi.com Message-ID: <20040826164610.GA11790@middle.of.nowhere> References: <4128941D.9030000@trash.net> <20040822214746.1efb3682.davem@redhat.com> Reply-To: Jurriaan Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Patrick McHardy , herbert@gondor.apana.org.au, nuno.silva@vgertech.com, linux-kernel@vger.kernel.org, master@sectorb.msk.ru, netdev@oss.sgi.com Return-path: To: "David S. Miller" Content-Disposition: inline In-Reply-To: <20040822214746.1efb3682.davem@redhat.com> Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org From: David S. Miller Date: Sun, Aug 22, 2004 at 09:47:46PM -0700 > On Sun, 22 Aug 2004 14:39:57 +0200 > Patrick McHardy wrote: > > > Herbert Xu wrote: > > > > >Nuno Silva wrote: > > > > > >OK, this appears to be due to the changeset titled > > > > > >[PKT_SCHED]: Refcount qdisc->dev for __qdisc_destroy rcu-callback > > > > > >It adds a reference to dev. > > > > > >I don't see any code that cleans up that reference when the dev goes > > >down. So someone needs to add that similar to the code in net/core/dst.c. > > > > > >Patrick, could you please have a look at this? > > > > > The reference is dropped in __qdisc_destroy. The problem lies in the CBQ > > qdisc, it doesn't destroy the root-class and leaks the inner qdisc. These > > two patches for 2.4 and 2.6 fix the problem. > > Awesome, good detective work guys. > > Patch applied, thanks. I get the same error with 2.6.9-rc1-mm1, but now for my ipv6-over-ipv4 tunnel. unregister_netdevice: waiting for xs6all to become free etc. when trying to reboot or shutdown. Usage count = 1 I'm pretty sure I didn't see this in 2.6.8.1 nor in 2.6.8.1-mm1. This is a plain ipv6-over-ipv4 tunnel like this: /etc/network/interfaces: auto xs6all iface xs6all inet6 v4tunnel endpoint xxx.xxx.xxx.xxx up ip route add 2000::0/3 via xxx:xxx:xxx:xxx:xxx:xxx address xxx:xxx:xxx:xxx:xxx:xxx netmask 64 up ip tunnel change xs6all ttl 64 I'm running Debian Unstable with all the latest updates as of today. Thanks for any hints, Jurriaan -- "At least she's on our side," said Lindholm. Corbie looked at him. "Investigators aren't on anybody's side." Simon R Green - Hellworld Debian (Unstable) GNU/Linux 2.6.9-rc1 2x6078 bogomips load 0.46