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

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Message-ID: <50532FA1.3070706@gmail.com>
Date:	Fri, 14 Sep 2012 21:22:41 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Sylvain Munaut <s.munaut@...tever-company.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 )

On 09/14/2012 01:35 AM, Sylvain Munaut wrote:
> Hi,
>
>> Yes, but I have some worries of why it is needed.
>>
>> Isnt it covering a bug elsewhere ?
>
> That may very well be.
>
> Of the few test servers I have running the same kernel, I just found
> the one with netconsole active to be "stuck".
>
> Not frozen, but all user process are hanged up and it's spitting
> message about processes and CPU being "stuck". The trace is different
> in each case depending on what the process was actually doing at the
> time it got stuck.
>
> No message sent to the netconsole with the root cause and nothing was
> written in the logs ...
>

Yeah, in this case, kdump is your friend. :)

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.

Thanks!

View attachment "netpoll-txq.diff" of type "text/x-patch" (1646 bytes)