From: Jarno Rajahalme <ja...@ovn.org>
Date: Tue, 28 Mar 2017 11:25:26 -0700
> The reference count held for skb needs to be released when the skb's
> nfct pointer is cleared regardless of if nf_ct_delete() is called or
> not.
>
> Failing to release the skb's reference cound led to deferred conntrack
> cleanup spinning forever within nf_conntrack_cleanup_net_list() when
> cleaning up a network namespace:
>
> kworker/u16:0-19025 [004] 45981067.173642: sched_switch:
> kworker/u16:0:19025 [120] R ==> rcu_preempt:7 [120]
> kworker/u16:0-19025 [004] 45981067.173651: kernel_stack: <stack trace>
> => ___preempt_schedule (ffffffffa001ed36)
> => _raw_spin_unlock_bh (ffffffffa0713290)
> => nf_ct_iterate_cleanup (ffffffffc00a4454)
> => nf_conntrack_cleanup_net_list (ffffffffc00a5e1e)
> => nf_conntrack_pernet_exit (ffffffffc00a63dd)
> => ops_exit_list.isra.1 (ffffffffa06075f3)
> => cleanup_net (ffffffffa0607df0)
> => process_one_work (ffffffffa0084c31)
> => worker_thread (ffffffffa008592b)
> => kthread (ffffffffa008bee2)
> => ret_from_fork (ffffffffa071b67c)
>
> Fixes: dd41d33f0b03 ("openvswitch: Add force commit.")
> Reported-by: Yang Song <yangs...@vmware.com>
> Signed-off-by: Jarno Rajahalme <ja...@ovn.org>
Applied, thanks.
