linux-kernel - Re: [PATCH] net: ip, diag -- Adjust raw_abort to use unlocked __udp

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Date:   Tue, 01 Nov 2016 13:52:34 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Cyrill Gorcunov <gorcunov@...il.com>
Cc:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
        dsa@...ulusnetworks.com, jhs@...atatu.com,
        linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru,
        jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
        avagin@...nvz.org, stephen@...workplumber.org
Subject: Re: [PATCH] net: ip, diag -- Adjust raw_abort to use unlocked
 __udp_disconnect

On Tue, 2016-11-01 at 23:05 +0300, Cyrill Gorcunov wrote:
> While being preparing patches for killing raw sockets via
> diag netlink interface I noticed that my runs are stuck:
> 
>  | [root@...7 ~]# cat /proc/`pidof ss`/stack
>  | [<ffffffff816d1a76>] __lock_sock+0x80/0xc4
>  | [<ffffffff816d206a>] lock_sock_nested+0x47/0x95
>  | [<ffffffff8179ded6>] udp_disconnect+0x19/0x33
>  | [<ffffffff8179b517>] raw_abort+0x33/0x42
>  | [<ffffffff81702322>] sock_diag_destroy+0x4d/0x52
> 
> which has not been the case before. I narrowed it down to the commit
> 
>  | commit 286c72deabaa240b7eebbd99496ed3324d69f3c0
>  | Author: Eric Dumazet <edumazet@...gle.com>
>  | Date:   Thu Oct 20 09:39:40 2016 -0700
>  | 
>  |     udp: must lock the socket in udp_disconnect()
> 
> where we start locking the socket for different reason.
> 
> So the raw_abort escaped the renaming and we have to
> fix this typo using __udp_disconnect instead.
> 

The preferred way to cite a bug origin is :

Fixes: 286c72deabaa ("udp: must lock the socket in udp_disconnect()")

> CC: David S. Miller <davem@...emloft.net>
> CC: Eric Dumazet <eric.dumazet@...il.com>
> CC: David Ahern <dsa@...ulusnetworks.com>
> CC: Alexey Kuznetsov <kuznet@....inr.ac.ru>
> CC: James Morris <jmorris@...ei.org>
> CC: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
> CC: Patrick McHardy <kaber@...sh.net>
> CC: Andrey Vagin <avagin@...nvz.org>
> CC: Stephen Hemminger <stephen@...workplumber.org>

That is a lot of CC ...

> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>

Acked-by: Eric Dumazet <edumazet@...gle.com>

Thanks.