From: poma <pomidorabelisima@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>,
Dominick Grift <dac.override@gmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: Suspicious RCU usage in bridge with Linux v4.0-9362-g1fc149933fd4
Date: Tue, 12 May 2015 02:13:28 +0200 [thread overview]
Message-ID: <555145A8.8010003@gmail.com> (raw)
In-Reply-To: <1431355986.566.18.camel@edumazet-glaptop2.roam.corp.google.com>
On 11.05.2015 16:53, Eric Dumazet wrote:
> On Mon, 2015-05-11 at 15:15 +0200, Dominick Grift wrote:
>> On Mon, May 04, 2015 at 02:35:27PM -0700, Cong Wang wrote:
>>
>> <snip>
>>
>>> It _looks like_ we only retrieve vlan info to fill netlink
>>> messages in timer context, so it doesn't seem we need to
>>> hold br->lock here.
>>>
>>> But I never look into br vlan code of course.
>>
>> This is just a friendly reminder that this issue still exits in: 4.1.0-0.rc2.git3.1
>>
>> Ignore me if you are aware of the above
>>
>
> Hi Dominick
>
> Have you tried this patch I sent last monday ?
>
https://bugzilla.kernel.org/show_bug.cgi?id=98081#c2
> I will submit formally when I get a test result.
>
> Thanks
>
> diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c
> index 4fcaa67750fda845ad0a180332c4cd96a9524086..7caf7fae2d5b8aa369b924e1c87a47c343fb8954 100644
> --- a/net/bridge/br_stp_timer.c
> +++ b/net/bridge/br_stp_timer.c
> @@ -97,7 +97,9 @@ static void br_forward_delay_timer_expired(unsigned long arg)
> netif_carrier_on(br->dev);
> }
> br_log_state(p);
> + rcu_read_lock();
> br_ifinfo_notify(RTM_NEWLINK, p);
> + rcu_read_unlock();
> spin_unlock(&br->lock);
> }
>
>
>
> --
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>
next prev parent reply other threads:[~2015-05-12 0:13 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-23 17:07 Suspicious RCU usage in bridge with Linux v4.0-9362-g1fc149933fd4 Josh Boyer
2015-04-23 17:35 ` Sudeep Holla
2015-04-23 22:53 ` Cong Wang
2015-05-04 13:39 ` Dominick Grift
2015-05-04 18:45 ` Cong Wang
2015-05-04 20:27 ` Stephen Hemminger
2015-05-04 21:35 ` Cong Wang
2015-05-11 13:15 ` Dominick Grift
2015-05-11 14:53 ` Eric Dumazet
2015-05-11 17:42 ` Dominick Grift
2015-05-12 0:13 ` poma [this message]
2015-05-12 0:37 ` Eric Dumazet
2015-05-12 1:33 ` poma
2015-05-12 18:27 ` Dominick Grift
2015-05-21 19:22 ` Josh Boyer
2015-05-21 20:06 ` Eric Dumazet
2015-05-05 2:32 ` Vlad Yasevich
2015-05-04 20:49 ` Eric Dumazet
2015-05-04 21:38 ` Cong Wang
2015-05-04 22:06 ` Eric Dumazet
2015-05-04 22:17 ` Cong Wang
2015-05-04 22:29 ` Eric Dumazet
2015-05-04 22:44 ` Cong Wang
2015-05-04 23:00 ` Eric Dumazet
2015-05-04 23:22 ` David Miller
2015-05-05 8:33 ` Dominick Grift
2015-05-21 20:28 ` [PATCH net] bridge: fix lockdep splat Eric Dumazet
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