netdev - Re: [PATCH 0/3] bonding: 3 fixes for 2.6.24

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Date:	Wed, 9 Jan 2008 07:35:35 +0100 (CET)
From:	Krzysztof Oledzki <olel@....pl>
To:	Jay Vosburgh <fubar@...ibm.com>
cc:	netdev@...r.kernel.org, Jeff Garzik <jgarzik@...ox.com>,
	David Miller <davem@...emloft.net>,
	Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH 0/3] bonding: 3 fixes for 2.6.24 



On Tue, 8 Jan 2008, Jay Vosburgh wrote:

> Krzysztof Oledzki <olel@....pl> wrote:
>
>> On Mon, 7 Jan 2008, Jay Vosburgh wrote:
>>
>>> 	Following are three fixes to fix locking problems and
>>> silence locking-related warnings in the current 2.6.24-rc.
>>>
>>> 	patch 1: fix locking in sysfs primary/active selection
>>>
>>> 	Call core network functions with expected locks to
>>> eliminate potential deadlock and silence warnings.
>>>
>>> 	patch 2: fix ASSERT_RTNL that produces spurious warnings
>>>
>>> 	Relocate ASSERT_RTNL to remove a false warning; after patch,
>>> ASSERT is located in code that holds only RTNL (additional locks were
>>> causing the ASSERT to trip)
>>>
>>> 	patch 3: fix locking during alb failover and slave removal
>>>
>>> 	Fix all call paths into alb_fasten_mac_swap to hold only RTNL.
>>> Eliminates deadlock and silences warnings.
>>>
>>> 	Patches are against the current netdev-2.6#upstream branch.
>>>
>>> 	Please apply for 2.6.24.
>>
>> 2.6.24-rc7 + patches #1, #2, #3:
>>
>> bonding: bond0: setting mode to active-backup (1).
>> bonding: bond0: Setting MII monitoring interval to 100.
>> ADDRCONF(NETDEV_UP): bond0: link is not ready
>> bonding: bond0: Adding slave eth0.
>> e1000: eth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
>> bonding: bond0: making interface eth0 the new active one.
>> bonding: bond0: first active interface up!
>> bonding: bond0: enslaving eth0 as an active interface with an up link.
>> bonding: bond0: Adding slave eth1.
>> ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
>>
>> =========================================================
>> [ INFO: possible irq lock inversion dependency detected ]
>> 2.6.24-rc7 #1
>> ---------------------------------------------------------
>> events/0/9 just changed the state of lock:
>> (&mc->mca_lock){-+..}, at: [<c041258e>] mld_ifc_timer_expire+0x130/0x1fb
>> but this lock took another, soft-read-irq-unsafe lock in the past:
>> (&bond->lock){-.--}
>>
>> and interrupts could create inverse lock ordering between them.
>
> 	Just to be clear: the patch set I posted yesterday was not
> intended to resolve the lockdep problem; I haven't studied that one yet.

Fine. Just let you know that someone test your patches and everything 
works, except mentioned problem.

Best regards,

 				Krzysztof Olędzki