netdev - Re: [Patch net] rds: mark bound socket with SOCK_RCU

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Date:   Mon, 10 Sep 2018 17:59:18 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Santosh Shilimkar <santosh.shilimkar@...cle.com>
Cc:     Sowmini Varadhan <sowmini.varadhan@...cle.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        rds-devel@....oracle.com
Subject: Re: [Patch net] rds: mark bound socket with SOCK_RCU_FREE

On Mon, Sep 10, 2018 at 5:56 PM Santosh Shilimkar
<santosh.shilimkar@...cle.com> wrote:
>
> On 9/10/2018 5:45 PM, Cong Wang wrote:
> > On Mon, Sep 10, 2018 at 5:26 PM Santosh Shilimkar
> > <santosh.shilimkar@...cle.com> wrote:
> >> Would you mind posting an updated patch please with call_rcu and
> >> above extended RCU grace period with rcu_read_lock. Thanks !!
> >
> > If you prefer to fix _two_ problems in one patch, sure.
> >
> > For the record, the bug this patch fixes is NOT same with the one
> > in rds_find_bound(), because there is no rds_find_bound() in
> > the backtrace. If you want to see the full backtrace, here it is:
> >
> > https://marc.info/?l=linux-netdev&m=153644444808962&w=2
> >
> > This is why I believe they are two problems.
> >
> > Whether fixing two problems in one patch or two patches is
> > merely a preference, I leave it up to you.
> >
> I had a partial fix as well in past but since it wasn't covering
> complete window, it was abandoned.
>
> Since we know the other race, it would be best to address it
> together and hence requested a combine patch. Thanks for help !!

No problem! v2 is coming shortly after passing syzbot test. :)