From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Landley Subject: Re: 2.6.38 containers bug: Infinite loop in /proc/sys/net/ipv6/neigh/neigh/neigh... Date: Wed, 30 Mar 2011 05:16:19 -0500 Message-ID: <4D9302F3.6080206@parallels.com> References: <4D92E9DC.3070405@parallels.com> <20110330.020120.02272125.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Cc: , , , To: David Miller Return-path: In-Reply-To: <20110330.020120.02272125.davem@davemloft.net> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On 03/30/2011 04:01 AM, David Miller wrote: > From: Rob Landley > Date: Wed, 30 Mar 2011 03:29:16 -0500 > >> In the host context a find on /proc completes, but inside an lxc >> container a find on /proc never completes, due to the endless loop in >> the title. (It's not a symlink, it seems to be a cross linked directory.) >> >> This is vanilla 2.6.38, I can attach my .config if you think it'd help. >> (The container's the lxc debian sid template but that's probably not >> relevant.) > > Please CC: netdev@vger.kernel.org when a bug might be related to > networking, as is obviously the case here. > > This bug should be fixed by the following patch: > > -------------------- > commit 9d2a8fa96a44ba242de3a6f56acaef7a40a97b97 > Author: Eric W. Biederman > Date: Mon Mar 21 18:23:34 2011 -0700 > > net ipv6: Fix duplicate /proc/sys/net/ipv6/neigh directory entries. > > When I was fixing issues with unregisgtering tables under /proc/sys/net/ipv6/neigh > by adding a mount point it appears I missed a critical ordering issue, in the > ipv6 initialization. I had not realized that ipv6_sysctl_register is called > at the very end of the ipv6 initialization and in particular after we call > neigh_sysctl_register from ndisc_init. > > "neigh" needs to be initialized in ipv6_static_sysctl_register which is > the first ipv6 table to initialized, and definitely before ndisc_init. > This removes the weirdness of duplicate tables while still providing a > "neigh" mount point which prevents races in sysctl unregistering. > > This was initially reported at https://bugzilla.kernel.org/show_bug.cgi?id=31232 > Reported-by: sunkan@zappa.cx > Signed-off-by: Eric W. Biederman > Signed-off-by: David S. Miller Yes, that fixed it. Pinging the stable guys to make sure this goes in a dot release. Thanks, Rob