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Subjectnetfilter,rcu: hang in nf_conntrack_net_exit
Hi all,

I've stumbled on the following while fuzzing with trinity inside a KVM tools guest, using the latest -next kernel.

[ 483.990135] INFO: task kworker/u:0:6 blocked for more than 120 seconds.
[ 483.991328] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 483.992500] kworker/u:0 D ffff88000adfa4c8 3160 6 2 0x00000000
[ 483.993527] ffff88000d655a60 0000000000000086 ffff880035bd7640 00000000001d7640
[ 483.994667] ffff88000d655fd8 ffff88000d655fd8 ffff88000d655fd8 ffff88000d655fd8
[ 483.995945] ffff880008448000 ffff88000d65b000 ffff88000d655a50 ffff88000d655c18
[ 483.997202] Call Trace:
[ 483.997653] [<ffffffff83788d25>] schedule+0x55/0x60
[ 483.998449] [<ffffffff83786d7a>] schedule_timeout+0x3a/0x370
[ 483.999461] [<ffffffff8115d4a9>] ? mark_held_locks+0xf9/0x130
[ 484.000016] [<ffffffff83789443>] ? wait_for_common+0xf3/0x170
[ 484.000016] [<ffffffff8378a44b>] ? _raw_spin_unlock_irq+0x2b/0x80
[ 484.000016] [<ffffffff8115d758>] ? trace_hardirqs_on_caller+0x118/0x140
[ 484.000016] [<ffffffff8378944b>] wait_for_common+0xfb/0x170
[ 484.000016] [<ffffffff8112fd90>] ? try_to_wake_up+0x290/0x290
[ 484.000016] [<ffffffff811a7960>] ? __call_rcu+0x390/0x390
[ 484.000016] [<ffffffff83789568>] wait_for_completion+0x18/0x20
[ 484.000016] [<ffffffff8111548f>] wait_rcu_gp+0x6f/0xa0
[ 484.000016] [<ffffffff811130f0>] ? perf_trace_rcu_utilization+0xd0/0xd0
[ 484.000016] [<ffffffff83789394>] ? wait_for_common+0x44/0x170
[ 484.000016] [<ffffffff811aa126>] synchronize_rcu+0x86/0x90
[ 484.000016] [<ffffffff83131455>] synchronize_net+0x35/0x40
[ 484.000016] [<ffffffff83194125>] nf_conntrack_cleanup+0x55/0x70
[ 484.000016] [<ffffffff831948a2>] nf_conntrack_net_exit+0x72/0x80
[ 484.000016] [<ffffffff83125285>] ops_exit_list.isra.0+0x35/0x70
[ 484.000016] [<ffffffff83125c70>] cleanup_net+0x100/0x1a0
[ 484.000016] [<ffffffff8110c926>] process_one_work+0x3e6/0x790
[ 484.000016] [<ffffffff8110c7e0>] ? process_one_work+0x2a0/0x790
[ 484.000016] [<ffffffff83125b70>] ? net_drop_ns+0x40/0x40
[ 484.000016] [<ffffffff8110d568>] ? worker_thread+0x48/0x380
[ 484.000016] [<ffffffff8110d719>] worker_thread+0x1f9/0x380
[ 484.000016] [<ffffffff8110d520>] ? manage_workers.isra.8+0x110/0x110
[ 484.000016] [<ffffffff8111823d>] kthread+0xad/0xc0
[ 484.000016] [<ffffffff8378d134>] kernel_thread_helper+0x4/0x10
[ 484.000016] [<ffffffff8378b234>] ? retint_restore_args+0x13/0x13
[ 484.000016] [<ffffffff81118190>] ? insert_kthread_work+0x40/0x40
[ 484.000016] [<ffffffff8378d130>] ? gs_change+0x13/0x13
[ 484.000016] 3 locks held by kworker/u:0/6:
[ 484.000016] #0: (netns){.+.+.+}, at: [<ffffffff8110c7e0>] process_one_work+0x2a0/0x790
[ 484.000016] #1: (net_cleanup_work){+.+.+.}, at: [<ffffffff8110c7e0>] process_one_work+0x2a0/0x790
[ 484.000016] #2: (net_mutex){+.+.+.}, at: [<ffffffff83125bf0>] cleanup_net+0x80/0x1a0


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