netdev - Re: ip_vs_ftp causing ip_vs oops on module load.

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Date:	Thu, 19 May 2011 09:33:55 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	Simon Horman <horms@...ge.net.au>
cc:	Dave Jones <davej@...hat.com>, netdev@...r.kernel.org,
	Wensong Zhang <wensong@...uxvirtualserver.org>,
	Hans Schillstrom <hans@...illstrom.com>
Subject: Re: ip_vs_ftp causing ip_vs oops on module load.


	Hello,

On Thu, 19 May 2011, Simon Horman wrote:

> > >  Call Trace:
> > >   [<ffffffff8107be36>] raw_notifier_chain_register+0xe/0x10
> > >   [<ffffffff81403058>] register_netdevice_notifier+0x2d/0x1b6
> > >   [<ffffffffa0432106>] ? ip_vs_conn_init+0x106/0x106 [ip_vs]
> > >   [<ffffffffa04322c7>] ip_vs_control_init+0xa5/0xce [ip_vs]
> > >   [<ffffffffa0432106>] ? ip_vs_conn_init+0x106/0x106 [ip_vs]
> > >   [<ffffffffa0432116>] ip_vs_init+0x10/0x11c [ip_vs]
> > >   [<ffffffff81002099>] do_one_initcall+0x7f/0x13a
> > >   [<ffffffff81096524>] sys_init_module+0x132/0x281
> > >   [<ffffffff814cc702>] system_call_fastpath+0x16/0x1b
> > >  Code: 07 ff c8 89 43 48 eb 08 48 89 df e8 dc 95 44 00 4c 89 e6 48 89 df e8 a7 a5 44 00 5b 41 5c 5d c3 55 48 89 e5 66 66 66 66 90 eb 0c <8b> 50 10 39 56 10 7f 0c 48 8d 78 08 48 8b 07 48 85 c0 75 ec 48 
> > >  RIP  [<ffffffff8107bddb>] notifier_chain_register+0xb/0x2a
> > >   RSP <ffff880114139e68>
> > >  ---[ end trace e90d7053ad1a7a5b ]---
> > > 
> > > 
> > > This script replicates the bug.
> > > (it usually oopses after just a few loops)
> > > 
> > > #!/bin/sh
> > > while [ 1 ];
> > > do
> > > 	modprobe ip_vs_ftp
> > > 	modprobe -r ip_vs_ftp
> > > done
> > > 
> > > Looks like something isn't getting cleaned up on module exit
> > > that we fall over when we encounter it next time it gets loaded ?
> > 
> > Thanks Dave, I will look into this.
> 
> Hi Dave,
> 
> I'm not having much luck reproducing this in KVM.
> I will try this evening on real hardware.
> 
> Just to make sure we are testing the same thing, are you using Linus's tree?

	One unregister_netdevice_notifier(&ip_vs_dst_notifier);
is missing in ip_vs_control_cleanup for sure.

Regards

--
Julian Anastasov <ja@....bg>
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