netdev - Re: [Bonding-devel] [PATCH] bonding: cancel_delayed_work() -> cancel_delayed_work

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Date:	Thu, 17 Dec 2009 10:49:17 -0800
From:	Laurent Chavey <chavey@...gle.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Jay Vosburgh <fubar@...ibm.com>,
	Johannes Berg <johannes@...solutions.net>,
	Mikhail Markine <markine@...gle.com>, netdev@...r.kernel.org,
	bonding-devel@...ts.sourceforge.net,
	Petri Gynther <pgynther@...gle.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [Bonding-devel] [PATCH] bonding: cancel_delayed_work() -> 
	cancel_delayed_work_sync()

one instance that could be a problem

__exit bonding_exit(void)
    bond_free_all()
      	bond_work_cancel_all(bond);
        unregister_netdevice(bond_dev)

could the above result in an invalid pointer when trying
to use bond-> in one of the timer CB ?


On Thu, Dec 17, 2009 at 10:40 AM, Jarek Poplawski <jarkao2@...il.com> wrote:
> On Thu, Dec 17, 2009 at 08:12:53AM -0800, Jay Vosburgh wrote:
>>       There's already logic in the monitors (bond_mii_monitor, et al)
>> to check a sentinel (kill_timers) and do nothing (not acquire rtnl) and
>> return.
>
> Btw, this check should be repeated if bond->lock is given back and
> re-acquired. I can't see these kill_timers used in bond_sysfs.c though.
>
>>       What exactly is the nature of the race that doing cancel..sync
>> is fixing?  The bond_close function sets kill_timers prior to calling
>> the cancel functions, so the monitor function might run once, but it
>> should do nothing.
>
> I guess there is a problem with destructions, but I hope Mikhail will
> give more details.
>
> Jarek P.
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