netdev - Re: NULL deref in bnx2 / crashes ? ( was: netconsole leads to stalled CPU task )

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Message-ID: <CAF6-1L4VaG4JAK0kYYizMvhBcaUM5x3uatA7JpzZqzcJ+fmGww@mail.gmail.com>
Date:	Mon, 17 Sep 2012 12:57:30 +0200
From:	Sylvain Munaut <s.munaut@...tever-company.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: NULL deref in bnx2 / crashes ? ( was: netconsole leads to stalled
 CPU task )

Hi,

>> Anyway, I think Eric is right, the bug may be in other place. I am wondering
>> if the attached patch could help? It seems in netpoll tx path, we miss the
>> chance of calling ->ndo_select_queue().
>>
>> Please give it a try.
>
> This fixes the NULL deref as well. I applied your patch over vanilla
> 3.6-rc5 (so without eric's patch) and I can load netconsole without it
> crashing directly.
>
> I will try to put a bit of load on the machine and see how it behaves,
> if it solves the hung cpu tasks as well.

So far so good, the machine is still alive and well after 3 days with
netconsole enabled.

Cheers,

    Sylvain
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