From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: [slab poison overwritten] Re: [GIT] Networking Date: Mon, 21 Mar 2011 21:15:40 +0100 Message-ID: <1300738540.2837.5.camel@edumazet-laptop> References: <20110320.195156.226769634.davem@davemloft.net> <20110321125320.GA23490@elte.hu> <1300714346.2884.284.camel@edumazet-laptop> <20110321161528.GA28580@elte.hu> <20110321164238.GA5303@elte.hu> <20110321173941.GB3892@elte.hu> <1300730838.2884.578.camel@edumazet-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: David Miller , torvalds@linux-foundation.org, akpm@linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Thomas Gleixner , Arnd Bergmann , Pekka Enberg , Simon Horman , Julian Anastasov To: Ingo Molnar Return-path: Received: from mail-fx0-f46.google.com ([209.85.161.46]:56739 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754384Ab1CUUQg (ORCPT ); Mon, 21 Mar 2011 16:16:36 -0400 In-Reply-To: <1300730838.2884.578.camel@edumazet-laptop> Sender: netdev-owner@vger.kernel.org List-ID: Le lundi 21 mars 2011 =C3=A0 19:07 +0100, Eric Dumazet a =C3=A9crit : > Le lundi 21 mars 2011 =C3=A0 18:39 +0100, Ingo Molnar a =C3=A9crit : > > here's the same but with kallsyms enabled. > >=20 > > Thanks, > >=20 > > Ingo > >=20 > > [ 9.585627] initcall 0xffffffff81d5b806 returned 0 after 0 usecs > > [ 9.588960] calling 0xffffffff81d5b9da @ 1 > > [ 9.592303] IPVS: Creating netns size=3D1272 id=3D0 > > [ 9.595646] IPVS: __ip_vs_control_init(): alloc_percpu. > > [ 9.602298] IPVS: cannot register namespace. > > [ 9.605627] IPVS: can't setup control >=20 > It seems IPVS is busted in case of memory allocation error in=20 > __ip_vs_control_init() >=20 > IPVS deinits its "struct netns_ipvs" space, but something (in IPVS) u= ses > it after free. >=20 > __ip_vs_init() seems to be called before ip_vs_init() completes > correctly. We then keep in net->ipvs a pointer to some freed memory. >=20 > Commit 14e405461e664b7 did some changes in this area >=20 > Simon, any idea ? >=20 >=20 =46or the time being, we can avoid the false memory allocation error (a= nd leak) Thanks [PATCH] ipvs: fix a typo in __ip_vs_control_init() Reported-by: Ingo Molnar Signed-off-by: Eric Dumazet Cc: Simon Horman Cc: Julian Anastasov --- net/netfilter/ipvs/ip_vs_ctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_= ctl.c index b799cea..33733c8 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -3605,7 +3605,7 @@ int __net_init __ip_vs_control_init(struct net *n= et) =20 /* procfs stats */ ipvs->tot_stats.cpustats =3D alloc_percpu(struct ip_vs_cpu_stats); - if (ipvs->tot_stats.cpustats) { + if (!ipvs->tot_stats.cpustats) { pr_err("%s(): alloc_percpu.\n", __func__); return -ENOMEM; }