From: Alexey Kodanev <alexey.kodanev@xxxxxxxxxx>
Date: Fri, 26 Jan 2018 15:14:16 +0300
> 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@xxxxxxxxxx>
> ---
>
> v2: * corrected bug origin commit id
> * clarified commit message about sk_stop_timer()
Applied and queued up for -stable.
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