netdev - Re: [PATCH net v2] dccp: don't restart ccid2_hc_tx_rto

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Date:   Fri, 26 Jan 2018 07:56:18 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Alexey Kodanev <alexey.kodanev@...cle.com>, netdev@...r.kernel.org
Cc:     Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>, dccp@...r.kernel.org
Subject: Re: [PATCH net v2] dccp: don't restart ccid2_hc_tx_rto_expire() if
 sk in closed state

On Fri, 2018-01-26 at 15:14 +0300, Alexey Kodanev wrote:
> ccid2_hc_tx_rto_expire() timer callback always restarts the timer
> again and can run indefinitely (unless it is stopped outside), and after
> commit 120e9dabaf55 ("dccp: defer ccid_hc_tx_delete() at dismantle time"),
> which moved ccid_hc_tx_delete() (also includes sk_stop_timer()) from
> dccp_destroy_sock() to sk_destruct(), this started to happen quite often.
> The timer prevents releasing the socket, as a result, sk_destruct() won't
> be called.
> 
> Found with LTP/dccp_ipsec tests running on the bonding device,
> which later couldn't be unloaded after the tests were completed:
> 
>   unregister_netdevice: waiting for bond0 to become free. Usage count = 148
> 
> Fixes: 2a91aa396739 ("[DCCP] CCID2: Initial CCID2 (TCP-Like) implementation")
> Signed-off-by: Alexey Kodanev <alexey.kodanev@...cle.com>
> ---

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

Thanks Alexey.