netdev - Re: Freeing alive fib_info caused by ebc0ffae5

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Message-ID: <1288866626.2659.71.camel@edumazet-laptop>
Date:	Thu, 04 Nov 2010 11:30:26 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	michael@...erman.id.au
Cc:	netdev@...r.kernel.org
Subject: Re: Freeing alive fib_info caused by ebc0ffae5

Le jeudi 04 novembre 2010 à 21:23 +1100, Michael Ellerman a écrit :
> Hi all,
> 
> I'm running Linus' latest or thereabouts (ff8b16d), and I'm seeing
> "Freeing alive fib_info" messages, from free_fib_info().
> 
> Actually I only get one per boot, when network interfaces come up.
> Seemingly related I am getting refcount problems when I shutdown, ie.
> unregister_netdevice() sees a usage count of 1, which never decrements.
> 
> Bisect says it's ebc0ffae5 which causes the problem, or makes it appear.
> 
>     fib: RCU conversion of fib_lookup()
>     
>     fib_lookup() converted to be called in RCU protected context, no
>     reference taken and released on a contended cache line (fib_clntref)
>     
> 
> Is this a bug in that commit, or a driver bug exposed?

Hi Michael, thanks for the report (and painful bisection I guess)

Thats hard to say... Is it reproductable on my machine ?

Thanks


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