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Date:	Fri, 19 Jul 2013 06:51:22 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>, Cong Wang <amwang@...hat.com>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org
Subject: Re: mod_timer: list_add corruption: WARNING: CPU: 1 PID: 0 at
 lib/list_debug.c:33 __list_add+0xbe/0xd0()

On Fri, 2013-07-19 at 15:40 +0200, Thomas Gleixner wrote:
> On Fri, 19 Jul 2013, Srivatsa S. Bhat wrote:
> > On 07/19/2013 04:55 PM, Thomas Gleixner wrote:
> > > On Tue, 16 Jul 2013, Srivatsa S. Bhat wrote:
> > >> ------------[ cut here ]------------
> > >> WARNING: CPU: 1 PID: 0 at lib/list_debug.c:33 __list_add+0xbe/0xd0()
> > >> list_add corruption. prev->next should be next (ffff8810396b5568), but was           (null). (prev=ffff88102c1344c0).
> > > 
> > > Can you please enable debugobjects?
> > > 
> > 
> > Sure Thomas, please find the new traces below, with
> > debug objects enabled.
> > Regards,
> > Srivatsa S. Bhat
> > 
> > 
> > ------------[ cut here ]------------
> > WARNING: CPU: 1 PID: 0 at lib/debugobjects.c:260 debug_print_object+0x8e/0xb0()
> > ODEBUG: init active (active state 0) object type: timer_list hint: br_multicast_group_expired+0x0/0x110 [bridge]
> 
> So an active enqueued timer gets reinitialized. Not so pretty :)
> 
> >  [<ffffffff812b5aee>] debug_print_object+0x8e/0xb0
> >  [<ffffffffa04247f0>] ? br_multicast_free_pg+0x20/0x20 [bridge]
> >  [<ffffffff812b65e2>] ? __debug_object_init+0x42/0x3f0
> >  [<ffffffff812b67bf>] __debug_object_init+0x21f/0x3f0
> >  [<ffffffff812b69df>] debug_object_init+0x1f/0x30
> >  [<ffffffff81060ea9>] init_timer_key+0x39/0x100
> >  [<ffffffffa0425ec5>] br_ip4_multicast_query+0x155/0x380 [bridge]
> 
> Here is the offending call site. I leave that to the network wizards.
> 
> > [<ffffffffa0427eef>] br_multicast_ipv4_rcv+0x2cf/0x3d0 [bridge]
> > [<ffffffff8162140b>] ? _raw_spin_unlock+0x2b/0x50
> > [<ffffffffa0419a9b>] ? br_fdb_update+0x1db/0x2b0 [bridge]
> > [<ffffffffa04284b5>] br_multicast_rcv+0x45/0x60 [bridge]
> > [<ffffffffa041bdfe>] br_handle_frame_finish+0x16e/0x3c0 [bridge]
> > [<ffffffffa041bac8>] br_handle_frame+0x238/0x400 [bridge]
> > [<ffffffffa041b890>] ? br_del_bridge+0x80/0x80 [bridge]
> > [<ffffffff81539ca7>] __netif_receive_skb_core+0x237/0x960
> > [<ffffffff81539ade>] ? __netif_receive_skb_core+0x6e/0x960
> > [<ffffffff8153a3f7>] __netif_receive_skb+0x27/0x70
> > [<ffffffff8153c6fd>] netif_receive_skb+0x2d/0x210
> > [<ffffffff81527e65>] ? __netdev_alloc_skb+0xa5/0x110
> > [<ffffffffa0129a0f>] be_rx_compl_process+0xef/0x140 [be2net]
> > [<ffffffffa0129dc2>] be_process_rx+0xe2/0x1a0 [be2net]
> > [<ffffffffa0129fbd>] be_poll+0x13d/0x1d0 [be2net]
> > [<ffffffff8153dab8>] net_rx_action+0xd8/0x2a0
> > [<ffffffff81058e19>] __do_softirq+0x149/0x400
> > [<ffffffff8105922d>] irq_exit+0xed/0x100
> > [<ffffffff8162d206>] do_IRQ+0x66/0xe0
> 
> Thanks,

Bug added by :

commit 9f00b2e7cf241fa389733d41b615efdaa2cb0f5b
Author: Cong Wang <amwang@...hat.com>
Date:   Tue May 21 21:52:55 2013 +0000

    bridge: only expire the mdb entry when query is received
    
    Currently we arm the expire timer when the mdb entry is added,
    however, this causes problem when there is no querier sent
    out after that.
    
    So we should only arm the timer when a corresponding query is
    received, as suggested by Herbert.
    
    And he also mentioned "if there is no querier then group
    subscriptions shouldn't expire. There has to be at least one querier
    in the network for this thing to work.  Otherwise it just degenerates
    into a non-snooping switch, which is OK."
    
    Cc: Herbert Xu <herbert@...dor.apana.org.au>
    Cc: Stephen Hemminger <stephen@...workplumber.org>
    Cc: "David S. Miller" <davem@...emloft.net>
    Cc: Adam Baker <linux@...er-net.org.uk>
    Signed-off-by: Cong Wang <amwang@...hat.com>
    Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
    Signed-off-by: David S. Miller <davem@...emloft.net>


I guess following should help 



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