On Tue, Jun 7, 2016 at 11:22 PM, Or Gerlitz <gerlitz.or@xxxxxxxxx> wrote:
> On Tue, Jun 7, 2016 at 1:45 PM, Erez Shitrit <erezsh@xxxxxxxxxxxxxxxxxx> wrote:
>> On Tue, Jun 7, 2016 at 10:31 AM, Or Gerlitz <gerlitz.or@xxxxxxxxx> wrote:
>>> On Sat, Jun 4, 2016 at 3:15 PM, Leon Romanovsky <leon@xxxxxxxxxx> wrote:
>>>
>>>> Fixes: 862096a8bbf8 ("IB/ipoib: Add more rtnl_link_ops callbacks")
>>>> Fixes: 9baa0b036410 ("IB/ipoib: Add rtnl_link_ops support")
>>>
>>> These two commits go back to 3.7-rc1 / Oct 2012 -- so I wonder how come we never
>>> got reports on this ABBA deadlock happens in real life - any idea, did
>>> you see the deadlock in
>>
>> Sure, it is from the real life, you can see the stack that i added to
>> the commit message.
>
> yes, but the bug you're pointing on is out there for whole four years
> and no one complained including you, can you explain that?
Not really, it is a race, not easy to see it, but it is there, waiting..
>
>> If you want to simulate that just add sleep in the remove_one while
>> trying to change mode/add-child etc.
>
> so why need to simulate? is that impossible to get it on non simulated env?
It happened in our regression system.
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