From: Eric Dumazet <eric.dumazet@gmail.com>
To: michael@ellerman.id.au
Cc: netdev@vger.kernel.org
Subject: Re: Freeing alive fib_info caused by ebc0ffae5
Date: Thu, 04 Nov 2010 11:30:26 +0100 [thread overview]
Message-ID: <1288866626.2659.71.camel@edumazet-laptop> (raw)
In-Reply-To: <1288866186.30549.10.camel@concordia>
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
next prev parent reply other threads:[~2010-11-04 10:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-04 10:23 Freeing alive fib_info caused by ebc0ffae5 Michael Ellerman
2010-11-04 10:30 ` Eric Dumazet [this message]
2010-11-04 10:46 ` Eric Dumazet
2010-11-04 11:21 ` Eric Dumazet
2010-11-04 11:23 ` Michael Ellerman
2010-11-04 11:35 ` Michael Ellerman
2010-11-04 19:06 ` David Miller
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