From: Gao feng <gaofeng@cn.fujitsu.com>
To: Eric Dumazet <eric.dumazet@gmail.com>,
Ding Tianhong <dingtianhong@huawei.com>
Cc: David Miller <davem@davemloft.net>,
yoshfuji@linux-ipv6.org, joe@perches.com, vfalico@redhat.com,
netdev@vger.kernel.org
Subject: Re: [PATCH net] net: neighbour: add neighbour dead check for neigh_timer_handler()
Date: Thu, 05 Dec 2013 08:32:00 +0800 [thread overview]
Message-ID: <529FC980.8020101@cn.fujitsu.com> (raw)
In-Reply-To: <1386170645.30495.108.camel@edumazet-glaptop2.roam.corp.google.com>
On 12/04/2013 11:24 PM, Eric Dumazet wrote:
> On Wed, 2013-12-04 at 17:16 +0800, Ding Tianhong wrote:
>>>> base->running_timer = neigh->timer;
>>>> neigh_timer_handler() => at this time, refcnt is 2;
>>>>
>>>> user-> neigh_changeaddr()
>>>> neigh_flush_dev();
>>>> neigh_del_imer, refcnt dec to 1;
>>>
>>> Nope : del_timer() would return 0 here, so we do not decrement refcnt.
>>>
>>
>> The first call for del_timer() will return 1, because the timer->entry.next is not NULL,
>> then in the neigh_destroy, the del_timer() again will return 0 because timer->entry.next is NULL.
>
> Again no. You are very mistaken.
>
> del_timer() return code is not a hint. Its a precise meaning.
>
> It cannot return 1 if the timer function is running or is about to run.
>
> If you believe there is bug in del_timer(), fix it ;)
>
>
Yes, you are right, __run_timers did this job.
So We still don't know what's the root reason.
next prev parent reply other threads:[~2013-12-05 0:30 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-03 13:48 [PATCH net] net: neighbour: add neighbour dead check for neigh_timer_handler() Ding Tianhong
2013-12-03 15:03 ` Hannes Frederic Sowa
2013-12-04 1:36 ` Ding Tianhong
2013-12-03 16:28 ` Eric Dumazet
2013-12-04 1:59 ` Ding Tianhong
2013-12-03 16:37 ` David Miller
2013-12-04 2:37 ` Gao feng
2013-12-04 4:04 ` Ding Tianhong
2013-12-04 4:21 ` David Miller
2013-12-04 6:19 ` Ding Tianhong
2013-12-04 6:27 ` Eric Dumazet
2013-12-04 9:16 ` Ding Tianhong
2013-12-04 10:10 ` Gao feng
2013-12-04 15:24 ` Eric Dumazet
2013-12-05 0:32 ` Gao feng [this message]
2013-12-05 3:17 ` Ding Tianhong
2013-12-18 6:37 ` Ding Tianhong
2013-12-18 7:51 ` Hannes Frederic Sowa
2013-12-18 8:19 ` Ding Tianhong
2013-12-18 8:41 ` Hannes Frederic Sowa
2013-12-18 8:57 ` Ding Tianhong
2013-12-18 9:28 ` Hannes Frederic Sowa
2013-12-18 10:02 ` Ding Tianhong
2013-12-18 10:21 ` Hannes Frederic Sowa
2013-12-18 11:57 ` Ding Tianhong
2013-12-18 14:27 ` Hannes Frederic Sowa
2013-12-18 15:12 ` Ding Tianhong
2013-12-18 15:46 ` Hannes Frederic Sowa
2013-12-19 3:32 ` Ding Tianhong
2013-12-04 6:36 ` David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=529FC980.8020101@cn.fujitsu.com \
--to=gaofeng@cn.fujitsu.com \
--cc=davem@davemloft.net \
--cc=dingtianhong@huawei.com \
--cc=eric.dumazet@gmail.com \
--cc=joe@perches.com \
--cc=netdev@vger.kernel.org \
--cc=vfalico@redhat.com \
--cc=yoshfuji@linux-ipv6.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).